Yes, your urine can be green or blue, Dr. Clifton says. “The antidepressant amitriptyline, the pain reliever indomethacin (Indocin, Tivorbex), and the anesthetic propofol (Diprivan) may turn your urine … The idea is to start out very slowly, beginning with 1 mg to 2 mg of THC per dose up to three times daily, and then add 1 mg to 2 mg to your daily dose every 1 to 2 days until you start to feel some noticeable effects. Then, even if the effects are subtle, I recommend holding at that dose for three days before further increasing. As shown in Table 1, urine tests are the most common type of drug test and can detect cannabis use for approximately 1-30 days after consumption. Saliva tests have a much shorter detection window, typically limited to 24 hours. Hair tests, on the other hand, are the most sensitive and can detect cannabis use for up to 90 days, making them ideal ...THC from an edible can last anywhere from 3 days to as long as 90 days in your system. But, of course, the exact duration depends on several factors, People with faster metabolism eliminate THC faster than those with slower metabolism. The duration, frequency, and potency also matter, especially since THC can accumulate over time.Curious about how long certain drugs stay in various parts of your body commonly used for drug testing? This chart will help you quickly locate the drug you ... Positive cutoff: 15 ng/mL. For medical purposes only; not valid for forensic use. The drug analyte detected in this assay, 9-carboxy THC, is a metabolite of delta-9-tetrahydrocannabinol (THC). Detection of 9-carboxy THC suggests use of, or exposure to, a product containing THC. This test cannot distinguish between prescribed or non-prescribed ... Yes, your urine can be green or blue, Dr. Clifton says. “The antidepressant amitriptyline, the pain reliever indomethacin (Indocin, Tivorbex), and the anesthetic propofol (Diprivan) may turn your urine …Thc levels in urine chart Thc levels urine thai edibles Thc urine concentrations metabolites cooh smoking. Medical marijuana cannabis, poem by kemy2u. Ratio thc infographic cannabisThc cannabis increase levels grow ways easy Thc urine time clear levels long take metabolite initialTwo puffs too bad: demystifying marijuana urine …renewed use of marijuana requires the comparison of the THC/ Creatinine ratios between multiple urine specimens. This ratio can be calculated by dividing the “THC” value by the Creatinine value then multiplying by 100. In general, an increase of more than 50% in the THC/Creatinine ratios between two urine specimens pro-Convenient & Affordable 4-Panel Drug Test without THC in Kansas. Affordable lab testing services for comprehensive results. Get tested today!Jan 31, 2024 ... Most of the tests in use today detect THC in levels above 50 ng/dL, so until you get below that level you will keep testing positive. Body fat ...With a currently accepted confirmation cutoff of 15 ng/ml for THC-COOH, which is most often used in urine-drug testing, the mean GC/MS THC-COOH detection times for the last positive urine sample, following the smoking of a single cigarette with 1.75 or 3.55% of THC, were 33.7±9.2 h (range 8−68.5 h) and 88.6±23.2 h (range 57−122.3 h ...Here is a guide to better understand the THC content of your cannabis. Smoke calculator Smoking, whether using a joint, bong or a bowl, results in more THC loss when inhaled — typically between ...Frequent consumers (daily or near-daily): THC may be detectable in your urine anywhere from 10 days to a month after last use. Note: these estimates are based on a general understanding of how THC is metabolized and excreted from the body and on findings from various studies and reviews. However, the detection window for THC in …Yes, your urine can be green or blue, Dr. Clifton says. “The antidepressant amitriptyline, the pain reliever indomethacin (Indocin, Tivorbex), and the anesthetic propofol (Diprivan) may turn your urine …The THC Creatinine Ratio Calculator is a valuable tool used in various aspects of healthcare and drug testing. It helps in determining the ratio of Tetrahydrocannabinol (THC) to Creatinine in a person’s urine sample. This ratio is often used in drug testing scenarios, particularly for individuals using marijuana or cannabis products.Jun 18, 2021 · Standard Drug Testing Cut-Off Levels from our SAMHSA Certified Labs. Updated On February 14, 2024 3:10 PM. Joe Reilly. Posted on June 18, 2021. This blog post shows several charts of drug testing cutoff levels so please scroll down to view all. These charts include Non-DOT testing with urine, hair and oral fluid as well as DOT regulated testing. The presence of delta-8 and/or delta-9 carboxy tetrahydrocannabinol (THC-COOH) in urine is a strong indicator that the patient has used cannabis/marijuana. THC- ... The parent drug, Δ 9 -tetrahydrocannabinol (THC), has a clearance half-life of less than 30 minutes and is not detectable in urine. Following a dose of THC, the metabolite typically appears in the urine within 60 minutes, but can take as long as 4 hours. Note: The presence of the major THC-COOH > LOQ indicates exposure to THC within 3 days ... Key Takeaways. THC, the chemical in cannabis, can be detected in urine, blood, and hair for varying periods of time after use.; Urine tests can detect THC for approximately 1-30 days, while saliva tests have a shorter detection window of a few hours.; Hair tests, being the most sensitive, can detect THC for up to 90 days.; The frequency of cannabis use …Average THC % in Flower. The THC percentage in weed ranges from 10-30%, meaning the average THC percentage is around 20%. If you walk into a dispensary, you will likely find this true while reviewing the menu. Ten percent is considered quite low for THC content, but may be balanced out by a higher CBD percentage.Some tests also test for the temperature of your urine to make sure it is not a substitute. Last but not least different tests check for different levels of THC-COOH in your urine. It can range from 15-50 ng (nanograms). The higher the level the easier it will be to pass a drug test. I have personally smoked 6 days before a test with a 20 ng ...This means that within 4-7 days, the vast majority of the THC will be gone from the system. In frequent users, however, a slower excretion occurs and is reflected by a 10-day terminal half-life. The researchers found that they could detect THC in the urine of frequent users for up to 2-4 weeks after quitting.Mar 6, 2023 · THC is detectable in urine testing for anywhere from 3 days to 30 days or longer. The range is wide and hard to predict because it depends heavily on how frequently a user partakes in marijuana. If you are familiar with cannabis baking, then you are probably aware that marijuana is fat-soluble. This means that the body is very skilled at ... Here is a guide to better understand the THC content of your cannabis. Smoke calculator Smoking, whether using a joint, bong or a bowl, results in more THC loss when inhaled — typically between ...The standard cut-off levels for THC in a urine drug test can vary depending on the specific testing guidelines and requirements. However, in general, the cut-off level for THC in a urine drug test is typically set at 50 nanograms per millilitre (ng/mL) or lower. References. Franz, T., Skopp, G., Schwarz, G., & Musshoff, F. (2018).When looking at THC levels (Urine Drug Testing ONLY) to determine the pattern of use, it is important to consider the THC/ Creatinine Ratio and not the THC level alone. THC levels will fluctuate over the course of the day based on the clients’ hydration status. Morning urine is generally more concentrated than late afternoon urine, following ...Urine testing does not look for THC, but a non-psychoactive metabolic intermediate— THC-COOH. After using cannabis, our liver metabolizes THC into THC …While urine tests check for cannabinoid metabolites, blood tests look for the presence of THC, and they’re ideal for detecting recent drug use. According to an article by the Addiction Center, THC stays in the blood anywhere between 4 and 24 hours, while chronic users can test positive for up to a week. Hair TestingDrug Test Resource Portal. Drug Test Calculator. Welcome to the world’s only data-driven cannabis drug test passing probability calculator. This application has been developed with over a decade of research and user submitted drug test results. Use it to determine what your odds of passing are when taking a urine or blood serum test. Y-axis: the levels of the THC-COOH in the urine. THC-COOH is the metabolite that drug test will detect. When this value is above the drug test cutoff level (50ng/ml) – the drug test will show a positive result. X-axis: days after you stopped smoking. We assume that the last day you smoked is the 0 day. Urine from marijuana users contains quantities of 9-carboxy-THC in both free and conjugated form, as well as other cannabinoids (THC and its metabolites) detectable by the test. When the manufacturer's instructions are followed, urine samples containing at least the stated detection level of 9-carboxy-THC will test positive at least 95% of the ...A seven-panel drug test is a test that detects seven specific drugs, substances and their metabolites using one urine sample. This type of test detects THC/marijuana, cocaine, morp...Even if you do find clean water, it must be warm to ensure human body temperature of a specimen because urine that is too cold or too hot will be suspicious. Finally, as well as an internally diluted sample, it will never pass an integrity check and will be rejected by laboratory. 5. Adding adulterants.Y-axis: the levels of the THC-COOH in the urine. THC-COOH is the metabolite that drug test will detect. When this value is above the drug test cutoff level (50ng/ml) – the drug test will show a positive result. X-axis: days after you stopped smoking. We assume that the last day you smoked is the 0 day.3. Wait 5 Minutes. A major benefit of Instant urine drug tests (i.e. cups and dip cards), as well as mouth swab drug tests, is that they are designed to yield results just a few minutes after a specimen (urine) collection. Tip: Do not read drug test results more than 10 minutes after a sample is collected.The urine marijuana test will be positive if the amount of THC in the sample is more than 50 nanograms per milliliter (ng/mL). If you use marijuana but your test is negative, it could be because your THC levels are below this level. A confirmation test can be done by a more sensitive method if the screening test is positive.A urine drug test can detect both illegal and prescription drugs in a person’s system. Doctors, sports officials, and many employers require these tests regularly. Urine tests are quick, easy ...The most common threshold for passing a test is 50 ug/ml. Immediately after smoking, you will pee about 150-250 ug/ml. This could be higher if you are a heavy user with a lot of body fat. The half life of Mary Jane is anywhere from 2-7 days, depending on how frequently you smoke. This means if u smoke a lot, after 1 week you will got from 200 ...The sodium urine test measures the amount of sodium the urine. The sodium urine test measures the amount of sodium the urine. Sodium can also be measured in a blood sample. After y...Sep 1, 2022 · The urine marijuana test will be positive if the amount of THC in the sample is more than 50 nanograms per milliliter (ng/mL). If you use marijuana but your test is negative, it could be because your THC levels are below this level. A confirmation test can be done by a more sensitive method if the screening test is positive. Apr 21, 2020 · One important factor is also the kind of urine THC tests that are being used. In the calculations above, it was presumed that the detection of THC in urine is being conducted with a standard drug screening test with a 20 ng/ml cut-off rate. Some laboratories might also be using an older lab screening test with 50 ng/ml cut-off rate. Y-axis: the levels of the THC-COOH in the urine. THC-COOH is the metabolite that drug test will detect. When this value is above the drug test cutoff level (50ng/ml) – the drug test will show a positive result. X-axis: days after you stopped smoking. We assume that the last day you smoked is the 0 day. False-negatives can occur when the urine drug concentration is below the threshold level set by the laboratory performing the test. 1,2 Dilute urine, the duration of time between ingestion of the drug and time of testing, and the quantity of the drug ingested may affect the occurrence of false-negatives. 1-2 While chronic marijuana use will ...Drug (and Some common Detectable duration Urine cut–off points Toxic Blood reference trade name) street names in urine after for reporting positive blood level (therapeutic) range last dose or limit of quantitation*. Pentobarbital Goof balls, 2 days 425 ng/mL (S)(1) >11 µg/mL <10 µg/mL (Nembutal) Downers, 200 ng/mL (C)(3) Nembies, Yellow ...Sep 8, 2023 · Cannabis potency plays a crucial role in determining the concentration of THC in urine. High-THC strains will result in higher THC levels in bodily fluids compared to strains with lower THC content. Additionally, the route of administration (e.g., smoking, vaping, or consuming edibles) affects how THC is absorbed and eliminated, influencing ... Laws regarding driving under the influence of marijuana vary from state to state, with a growing trend toward “per se” laws that use a level of delta-9-tetrahydrocannabinol (THC, one of the psychoactive substances in marijuana) in the blood, urine, or oral fluid as a determinant of intoxication. However, there is little evidence …This is reflected in the creatinine levels of 67.4, which is urine that is significantly less concentrated than that with a creatinine level of 262.6. In summary, the THC Level ALONE is only an indication that there is still THC present in the system. It is the THC/Creatinine Ratio that is used to determine whether new use of THC has occurred.URINE- DETECTION WINDOWT STIMULANTS Amphetamine Benzedrine, Dexedrine, Adderall, Vyvanse, Dextroamp, Adzenys, speed; ... Marinol, Syndros, dronabinol, marijuana, weed, cannabis, ganja, hashish, pot, THC; cannabinoid metabolite 4–12 hrs 1–45 days Ethanol Ethyl glucuronide, ethyl sulfate Ethanol metabolites 2–14 hrs <1 day …The chart below outlines approximate duration times in human urine. For oral drug detection times see Saliva Drug Detection Window . When interpreting the duration for the presence of drugs of abuse in the body, you must take into consideration variables including the body's metabolism, the subject’s physical condition, overall body fluid ...Nov 25, 2022 ... Tests can detect weed for up to 30 days in your urine, up to 24 hours in your saliva, and up to 12 hours in your blood. Due to the many factors ...This slow removal from the body makes the window for detecting THC in the urine much longer than most drugs, and more variable. 4. One metabolite that lingers around for a long time is known as 11-nor-9-carboxy-THC (carboxy-THC or THC-COOH for short). Most THC urine drug tests are looking for a breakdown product of THC-COOH, …General estimates for various cannabis tests are as follows: Urine tests: These tests can detect cannabis in the urine for approximately 1–30 days after use. Saliva tests: Typically, cannabis is ...While there are at least 70 chemical compounds present in cannabis, Δ 9-tetrahydrocannabinol (THC) is the primary psychoactive component (Kintz, 2020; UNODC, 2019). Thus, legislation around cannabis intoxication is centered on THC concentrations within the body. ... Urine, blood, sweat, hair, oral fluid, and breath have all been …THC(MARIJUANA) METABOLITE, IA: ng/mL: 8172-9: Reflex Table for THC(MARIJUANA) METABOLITE, IA; Order Code Order Name Result Code Result Name UofM Result LOINC; Reflex 1: 700817: THC,MS,WB/SP RFX: 700911: Cannabinoid Confirmation: 48943-5: Reflex Table for THC(MARIJUANA) METABOLITE, IA; Order Code Order Name Result …Cut-off : 50 ng/ml. This marijuana test will be positive if the sample tested contains at least 50 nanograms of THC per milliliter of urine, or negative if the sample contains less or not at all. Detection time of THC (cannabis active substance) in urine : 2 to 3 days for occasional consumption. 5 to 10 for more or less regular consumption.The urine test is based on detection of 11-nor-delta-9-tetrahydrocannabinol-9-carboxylic acid (9-carboxy-THC), a metabolite of delta-9-THC, which is the primary pharmacologically active component of marijuana. Studies involving humans indicate that 80%-90% of the total dose of delta-9-THC is excreted within 5 days--approximately 20% in urine ...Aug 18, 2016 ... In vivo adul-teration: excess fluid ingestion causes false-negative marijuana and cocaine urine test results. J Anal Toxicol. 1998;22(6):460 ... The most popular kind of drug test is the urine test, which can detect marijuana for days or weeks after use. Note that urine tests do not detect the psychoactive component in marijuana, THC (delta-9-tetrahydrocannabinol), and therefore in no way measure impairment; rather, they detect the non-psychoactive marijuana metabolite THC-COOH, which can linger in the body for days and weeks with no ... Notes Urine Serum Acetaminophen 10.0 € € € Amitriptyline 1.0 € Variability in the LOD € Amobarbital 1.0 Preferred test for detection of barbiturates is a specific request; see Specific Drug Group Confirmation € € Bupropion 1.0 € € € Butabarbital 1.0 Preferred test for detection of barbiturates is a specific request; seeAs shown in Table 1, urine tests are the most common type of drug test and can detect cannabis use for approximately 1-30 days after consumption. Saliva tests have a much shorter detection window, typically limited to 24 hours. Hair tests, on the other hand, are the most sensitive and can detect cannabis use for up to 90 days, making them ideal ...Peak plasma THC concentrations ranged from 46-188 ng/mL in 6 subjects after they smoked 8.8 mg THC over 10 minutes. Chronic users can have mean plasma levels of THC-COOH of 45 ng/mL, 12 hours after use; corresponding THC levels are, however, less than 1 ng/mL. Following oral administration, THC concentrations peak at 1-3 hours and are lower ...Marijuana THC Charts with Passing Percentile Trendlines. For explanation, if all else were equal and the odds of passing a urine drug test depended on only one factor, such as Smoking Frequency, a point on the 75th percentile trendline means that three out of four people should pass a drug test after that many days. Unfortunately, this is not ...The frequency and amount of marijuana used prior to stopping affect the severity and length of withdrawal and may appear in the form of physical symptoms such as: Changes in appetite. Flu-like symptoms (headache, sweating, shakiness, tremors, fever, and chills) Puking or vomiting. Stomach pain. Weakness or tiredness.Updated. you can change your mind anytime. If the level of THC in your urine is above the required level, you can accelerate the marijuana detox process by drinking more fluids, eating high-fiber foods, exercising, and using effective THC detox products. This online THC Calculator calculates the level of TetraHydroCannabinol (THC) in your body.cannabis can stay in your urine anytime from 5 - 95 days. In this table you can find general detection times for weed. Remember that these are not a guarantee and can vary by person. Marijuana Detection Time Chart. Urine Drug Test. 1 time only. 5-8 days. 2-4 times per month.Despite a computer-paced smoking procedure that controlled the number of puffs, length of inhalation, hold time, and time between puffs, there were large inter-subject differences in plasma THC concentrations due to differences in the depth of inhalation, as participants titrated their THC dose (Fig. 2).The mean THC concentrations were ca. 60 and 20% of …Marijuana Detection Time Chart: Urine Drug Test: Please check the Detection Time wiki for more information. I am a bot, and this action was performed automatically.Frequent consumers (daily or near-daily): THC may be detectable in your urine anywhere from 10 days to a month after last use. Note: these estimates are based on a general understanding of how THC is metabolized and excreted from the body and on findings from various studies and reviews. However, the detection window for THC in …(THC-OH) and 11-nor-9-Carboxy-Δ-9-THC (THC-COOH) from urine using Oasis PRiME µElution Plates. Δ-9-tetrahydrocannabinol (THC) is the main psychoactive element present in the plant Cannabis sativa. Quantitative analysis of these compounds in urine is an indicator of cannabis consumption, with high levels indicating recent and/or chronic use.Marijuana Metabolites, Urine. Test Resources. None found for this test Please visit our Clinical Education Center to stay informed on any future publications, ... 10 mL random urine collected in a plastic urine container, no preservative. Minimum Volume. 5 mL. Transport Container. Transport tube. Transport Temperature.Drug Testing Solutions At-A-Glance. Collection and Donor provides minimum 3 0 mL Testing Procedure urine (4 5 mL for a DOT collection) in the privacy of a restroom. Collector pours specimen into bottle. Bottle sealed with tamper-evident tape. Entire Custody and Control Form (CCF) completed. Hi , cannabis can stay in your urine anytime from 5 - 95 days. In this table you can find general detection times for weed. Remember that these are not a guarantee and can vary by person. Marijuana Detection Time Chart. Urine Drug Test. 1 time only. 5-8 days. 2-4 times per month. Marijuana Detection Time Chart Urine Drug Test; 1 time only: 5-8 days: 2-4 times per month: 11-18 days: 2-4 times week: 23-35 days: 5-6 times per week: 33-48 days: Daily Usage: 49-90 days ** Hair Drug Test: Up to 90 days, some States 120 days ** Saliva Drug Test: 1-10 days ** Blood Drug Test: 2 daysThe parent drug, Δ 9 -tetrahydrocannabinol (THC), has a clearance half-life of less than 30 minutes and is not detectable in urine. Following a dose of THC, the metabolite typically appears in the urine within 60 minutes, but can take as long as 4 hours. Note: The presence of the major THC-COOH > LOQ indicates exposure to THC within 3 days ...ketones. presence in urine is abnormal, may indicate diabetes. albumin. presence is abnormal, may indicate kidney disease. protein. presence is abnormal, may indicate kidney disease. bilirubin ...Thirty to 45 days can fail a THC urine drug test; Sixty to 75 days can fail a cannabis blood test; There are distinct rates at which individuals who smoked cannabis break their THC levels down in their bodies. The date ranges of the risk of failing a cannabis drug test can range in THC levels detected in blood or urine and the length of use.Precise THC detox calculator. While the chart does provide a decent basic overview, it’s not exactly precise. We’ve made an accurate THC drug test calculator which takes into account two things that influence metabolism of THC the most: Body fat percentage and urine THC metabolite levels.Urine testing does not look for THC, but a non-psychoactive metabolic intermediate— THC-COOH. After using cannabis, our liver metabolizes THC into THC …Apr 1, 2023 ... CHPR: Can second-hand exposure to marijuana result in a positive drug test for cannabis? Dr. Moeller: Technically yes, but it's highly unlikely. For a Free Telephone Consultation. 800-641-1970. [email protected]. While moves to legalize marijuana have been active across the country, and medical marijuana has become legal in Ohio, the State’s DUI/OVI remain unchanged. Drug OVI’s can be challenged and won.
Precise THC detox calculator. While the chart does provide a decent basic overview, it’s not exactly precise. We’ve made an accurate THC drug test calculator which takes into account two things that influence metabolism of THC the most: Body fat percentage and urine THC metabolite levels.. Pittsburgh homicides 2023
This test measures the amount of calcium in the urine. All cells need calcium in order to work. Calcium helps build strong bones and teeth. It is important for heart function, and ...Urine drainage bags collect urine. Your bag will attach to a catheter (tube) that is inside your bladder. You may have a catheter and urine drainage bag because you have urinary in...Protein amount. What it means. 30 mg/g or less. Normal. 30–300 mg/g. Moderately increased levels and potential chronic kidney disease. 300 mg/g or more. Severely increased levels. A reading of ... Updated. you can change your mind anytime. If the level of THC in your urine is above the required level, you can accelerate the marijuana detox process by drinking more fluids, eating high-fiber foods, exercising, and using effective THC detox products. This online THC Calculator calculates the level of TetraHydroCannabinol (THC) in your body. The idea is to start out very slowly, beginning with 1 mg to 2 mg of THC per dose up to three times daily, and then add 1 mg to 2 mg to your daily dose every 1 to 2 days until you start to feel some noticeable effects. Then, even if the effects are subtle, I recommend holding at that dose for three days before further increasing.Screening and confirmation cutoff levels often cause confusion when it comes to testing results. We are frequently asked how a regular hair drug test can confirm positive for Carboxy THC at, let’s say 0.15 pg/mg, when the screening cutoff is well over that limit at 1 pg/mg. The answer is that the screening and confirmation tests are ...Jul 31, 2023 · Marijuana is commonly smoked or vaporized due to the rapid onset of symptoms, but marijuana can also be eaten (i.e., "grass" brownies) or drank (i.e., marijuana tea or marijuana tincture). Smoked marijuana has an increased potency, quoted as high as 2.6 times by some sources. Marijuana is used for both recreational and therapeutic purposes. Apr 21, 2020 · One important factor is also the kind of urine THC tests that are being used. In the calculations above, it was presumed that the detection of THC in urine is being conducted with a standard drug screening test with a 20 ng/ml cut-off rate. Some laboratories might also be using an older lab screening test with 50 ng/ml cut-off rate. When you provide your urine sample, it is sent to a laboratory to undergo rigorous testing for drug metabolites. The immunoassay test, a fast and cost-efficient method, strives to uncover THC metabolites within your urine. Keep in mind, the lab doesn’t seek pure THC, but the bits and pieces leftover once your body has processed the THC. The ...Urine drug testing is frequently used in clinical, employment, educational, and legal settings and misin-terpretation of test results can result in significant adverse consequences for the individual who is being tested. Advances in drug testing technology combined with a rise in the number of novel misused sub-stances present challenges to ...Protein amount. What it means. 30 mg/g or less. Normal. 30–300 mg/g. Moderately increased levels and potential chronic kidney disease. 300 mg/g or more. Severely increased levels. A reading of ...The objective of this study was to develop and analytically validate a sensitive ultrahigh pressure LC (UHPLC)–electrospray ionization (ESI) combined with …Key Takeaways: Urine testing is commonly used by employers to screen for marijuana and other drugs.; The standard cutoff for a positive test is 50 ng/mL.; The detection window varies based on usage patterns, from 1-5 days for occasional users to 4-6 weeks for multiple daily users.; Techniques to pass a urine drug test include diluting the urine, …1-10 days. ** Blood Drug Test. 2 days. ** Fingernail Drug Test. 90 Days. ** Alcohol Drug Test. 3-5 days via Ethyl Gluconoride (EGT) or 10-12 hours via traditional method. Marijuana Detection Time Chart. Urine Drug Test.THC is the primary psychoactive component of cannabis and is a partial agonist to CB1 and CB2 receptors. ... Cannabinoids are primarily cleared by the liver and the minority of inactive metabolites are excreted in the urine, accounting for 20% of metabolite elimination. Terminal half-life varies based on frequency of use: several days in ....