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Frequently Asked Questions


Cleansing

False Positives and Detection Periods

General

 

What Substances could cause false positive test results?

Amphetamines False Positives

Over-the-counter cold and allergy remedies that contain ephedrine, pseudoephedrine, propylephedrine, phenylephrine or desoxyephedrine: Nyquil, Contactd, Sudafed, Allerest 12-Hour, A.R.M., Triaminic 12, Ornade, Tavist-D, Dimetapp, Sinex, Neosynephrine, Actifed, Bayer Selectd Maximum Strength Sinus Pain Relief Caplets, Contact Non-Drowsy Formula Sinus Caplets, Dristan Cold Caplets, Maximum Strength Sine-Aid Tablets, Maximum Strengeth Sudafed Sinus Caplets, Maximum Strength Tylenol Sinus Gelcaps, No Drowsiness Sinarest Tabs, Sinus Excedrin Extra Sterength Caplets, Characol Sinus, Drixoral Cold and Flu, Efidac/24, Phenegan-D, Robitussin Cold and Flu. Over-the-counter diet aids containing phenylpropanolamine: Dexatrim, Accutrim. Over-the-counter nasal sprays: Vicks inhaler, Afrin. Asthma medication: Marax, Bronkaid tablets, Primatine Tablets. Prescription medication: Amfeprainone, Cathne, Etafediabe, Morazone, phendimetrazine, phenmetrazine, benzphetamine, fenfluramine, dexfenfluramine, dexdenflurarnine, Redux, mephentermine, Mesocarb, methoxyphenamine, phentermine, amineptine, Pholedrine, hydroymethamphetamine, Dexedrine, amifepramone, clobenzorex, fenproyorex, mefenorex, fenelylline, Didrex, dextroamphetamine, methphenidate, Ritalin, pemoline, Cylert, selegiline, Deprenyl, Eldepryl, Famprofazone

Marijuana False Positives

Over-the-counter NSAIDS: lbuprofen; Advil, Nuprin, Mediprim, Motrin, Bayer Select Pain Relief Formula, Excedrin IB Caplets, Genpril, Haltran, lbuprin, Midol 200, Pamprin, Trendar Cramp Relief Formula, Cramp End Tablets, Medipren, Rufln, Naproxen, Aleve, Ketoprofen, Orudis KT. Prescription NSAIDS: Anaprox, Tolectin, ifenoprofen, flurbiprofen, oxaprozin, Ansaid, Clinoril, Dolobid, Feldene, Indocin, Lodine, Meclomen, Motrin, Nalfon, Naprosyn, Orudis, Relafen, Voltaren. Over-the-counter allergy preparations, sleep aids and antinausea medications that contain promethazine: Phenergan, Promethegan. Riboflavin (vitamin B2), Dronabinol, Edecrin.

Cocaine False Positives

Amoxicillin, tonic water

Opioids False Positives

Poppy seeds, Emprin, Tylenol with codeine, Capital with codeine, Margesic, rifampicin, Vicodin, Percodan, Percocet, Wygesic.

Barbiturates False Positives

Fiorinol, Donnatol, some sleeping pills, antiasthmatic preparations that contain phenobarbitol, Dilantin.

Benzodiazepines False Positives

Most prescription sleeping pills and anti-anxiety medication.

LSD False Positives

Migraine medication: egotamine, Ergostat, Cafergot, Wigraine, Imitrex. Hydergine, bromocription, methysergiside, lisuride, lysergol, Artane, triprolidine, amitriptyline (Elavil), dicyclomine (Bentyl), antinausea medications that contain promethazine: Phenergan, Promethegan.

What are the Drug Detection Periods?


Substance Detection Period
Amphetamines 2-5 days
Barbituates (Long-Acting) 3-4 weeks
Cannabinoids (THC, Marijuana) 5-60 days See Chart Below
Cocaine 1-4 days
Euphorics (Ecstacy, Shrooms) 5-7 days
LSD - ACID 7-10 days
Nicotine (Cigarettes) 4-10 days
Peptide hormones undetectable
Phenobarbital 10-20 days
Steroids (anabolic oral) 14-28 days
Barbituates (Short-Acting) 2 days
Benzodiazepines 7-10 days
Clenbuterol 4-6 days
Codeine 5-7 days
Ketamine (Special K) 5-7 days
Methamphetamines 5-7 days
Opiates 5-7 days
Phencyclidine PCP) 2-4 days
Propoxyphene 6 hours to 2 days
Steroids (anabolic parenterally) 1-3 months

Cannabinoids (THC, Marijuana) Detection Time
Frequency of Exposure Detection Period
1 time only 5-8 days
2-4x per month 11-18 days
2-4x per week 23-35 days
5-6x per week 33-48 days
Daily 49-63 days

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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