What is a False Positive Urine Test

What is a False Positive Urine Test and What Causes It?

What is a False Positive Urine Test

You might have heard that there are some false positive urine tests. Maybe you are worried whether yours might turn out wrong. For starters, the issue is all about what these tests are and what causes such results. Well, we provide you with meaningful insights to resolve your uncertainty.

What is a False Positive Urine Test?

In drug screening, a “false positive” implies that an example is dishonestly announced as positive regardless of whether it is drug-free. A drug test false positive (or a bogus positive medication test result) is a mistaken test outcome that says a patient or guinea pig has a lot of medication metabolites in the body.

You can imagine the disappoint and utter disillusionment you might get if you are genuinely drug-free but the medic testing you tells you are full of opiates in your body. Yes, you’ll miss the opportunity you are looking for. But if you know some of the factors that might lead to such false results, you might as well be in a position to defend yourself and ask for a more elaborate test.

It’s vital to look at some of the factors leading to false positives in urine tests and see some of the best products for passing urine test.

What Causes False Positives in Urine Tests?

Medication test bogus positives may come from a few potential reasons, some of which are the accompanying:

Inaccurate testing techniques: At the point when a positive outcome emerges in initial screening tests, corroborative tests, for example, the GC/MS technique ought to be directed to evacuate any probability of getting a bogus positive to nil.

Shallow drug test cutoff level. On the off chance that the medication testing research center uses a base limit an incentive for tranquilize affirmation that is excessively low, guineas pigs who experienced accidental introduction to sedate segments may get a positive outcome. For instance, used smoke from weed may render the results favourable if the cutoff level is excessively low.

Cross-reactivity of mixes drug parts: Different combinations such as active drug metabolites might be recognized.  For example, poppy seeds inaccurately thought to be sedatives.

Then again, false negatives may result from the accompanying variables:

Test defilement. A weakening of a pee test with water may diminish the grouping of a particular medication metabolite. Be that as it may, present-day testing strategies have just thought about this situation, and are utilizing new testing systems to decide if the example has been altered.

High drug test cutoff level. Setting high level may prompt non-identification of tests that contain a massive concentration of a specific drug. Let’s explain this further.

What Causes a False Positive Urine Test

What Drugs are Tested?

Medications tests are regularly done on pee, yet different sorts of samples are additionally utilized, for example, hair, spit or blood. The most usually screened substances, and required by Federal working environment rules, incorporate these five classifications of medications:

  • Amphetamines/methamphetamine
  • Sedatives/Heroin
  • Cocaine
  • Phencyclidine (PCP)
  • Maryjane/THC/Cannabinoids

Additional categories, as noted by SAMHSA, may include:

  • Barbiturates
  • Ethanol (alcohol)
  • Designer drugs like Spice, Bath Salts, or Ecstasy (MDMA)
  • Prescription opioids like oxycodone, hydrocodone, methadone
  • Benzodiazepines, like alprazolam (Xanax) or diazepam (Valium)

Understanding how drug tests are done will help clarify why false positives occur.

How are Drug Tests Done?

When initial screening drug tests (called immunoassays) bring about positive outcomes, a second corroborative (Gas Chromatography-Mass Spectrometry or GC-MS) analysis ought to be done.

3 GC-MS is an entirely positive test to recognize separate ingredients inside an example. In any case, GS-MS can likewise prompt a bogus negative if the GC-MS segment isn’t intended to distinguish every potential compound.

The underlying immunoassay permits speedy, massive scope screenings with an insignificant expense. At the point when pee or different examples are gathered, one bit ought to be put something aside for corroborative testing. For occurrences where an underlying medication screen restores a positive outcome, the GC-MS test is run on this extra spared bit to verify or refute results. GC-MS is considered the “best quality level” for drug testing.

A drug test may report the presence of illegal or professionally prescribed drugs in the immunoassay. This might be even though the individual has not interacted with that drug. It is significant that if you are experiencing drug testing, that you give a complete and exact history of every single doctor prescribed medication, over-the-counter (OTC) meds, and nutrient, dietary enhancement, and homegrown items utilized before the hour of the example assortment.

The aftereffects of your medication testing ought to stay private and kept separate from the standard worker work document.

Bogus positive medication test results have been accounted for in various medication classes. A portion of the more typical types include pain prescriptions and medications for diseases:

  • Antihistamines
  • Antidepressants
  • Antipsychotics
  • Anti-toxins
  • Analgesics
  • Some over-the-counter (OTC) drugs
  • Decongestants

The outline underneath distinguishes healthy substances answered to cause a bogus positive outcome depends on the underlying immunoassay testing. Keep in mind; any positive medication test ought to consistently be affirmed with an auxiliary analysis, for example, GC-MS that recognizes and gives distinguishing proof and levels of a particular compound.

Substances that May Meddle with Drug Testing

The list below highlights some of the elements that might meddle with these tests.

  • amantadine (Osmolex ER) amphetamines1
  • amitriptyline (Elavil, the brand ended in the US) LSD (corrosive lysergic diethylamide)13
  • benzphetamine (Regimex) amphetamines1
  • brompheniramine (Dimetapp) amphetamines and methamphetamines4,8
  • bupropion (Aplenzin, Forfivo XL, Wellbutrin XL, Zyban) amphetamines and methamphetamines8, LSD13
  • carbamazepine (Carbatrol, Equetro, Tegretol) tricyclic antidepressants1
  • chlorpromazine: amphetamines and methamphetamines8, methadone8
  • clomipramine (Anafranil): methadone8
  • coca leaf tea: cocaine1
  • cocaine sedatives, topical: cocaine1
  • cyclobenzaprine: (Fexmid, Amrix,  Flexeril [brand ended in the US])
  • tricyclic antidepressants1
  • cyproheptadine tricyclic antidepressants1
  • dextromethorphan (Nyquil Robitussin, Triaminic, Delsym)

Among many other similar non-prohibited drugs and substances as highlighted below

Additional Info

Dextromethorphan (Tussin)

Over-the-counter drugs such as dextromethorphan are known to lead to a bogus positive outcome for (phencyclidine) PCP. Dextromethorphan is artificially identified with levorphanol, an opiate pain relieving. The body processes codeine to morphine, and the two substances might be found after testing. Corroborative testing can recognize the items.

Poppy Seeds

Poppy seeds, frequently found on bagels, rolls, and baked goods have for some time been utilized as resistance against positive sedative test outcomes experienced on a pee drug screen. It is realized that poppy seeds do contain sedatives – explicitly morphine and codeine; be that as it may, content changes extraordinarily relying on seed source and handling. Nourishment preparing may bring down the sedative levels in poppy seeds.

In a recent report distributed in the Journal of Analytical Toxicology,10 specialists decided sedative fixations in sedative free volunteers from 15 minutes to 20 hours after utilization of raw poppy seeds (15 grams) and arranged poppy seeds on a roll. Focuses, both 300 and 1,200 g/mL were assessed in pee tests. Oral liquid focus shorts are set at 30 g/ml.

Utilizing the 2,000 g/mL cutoff for pee testing, morphine was not recognized in pee from seeds on moves; crude poppy seed utilization brought about a distinguishable level in pee during the first 6 hours after use. At 20 hours, no morphine was distinguished for rolls or crude seeds in pee testing.

With the 300 g/mL cutoff for pee testing, morphine was identified after moves in 50 per cent of tests at 20 hours, and in 100 per cent of crude poppy seeds following 20 hours. With oral liquid testing, morphine fell underneath the 30 g/mL identification limit with moves following 30 minutes and from raw seeds at 60 minutes.

Oral screening and the higher cutoff level of 2,000 g/mL may assist with diminishing the number of bogus positives because of poppy seed utilization. In any case, the general population commonly eats rolls or baked goods. It would have no explanation or want to devour unpalatable crude poppy seeds where morphine levels are distinguished significantly following 20 hours at the 300 g/mL limit.10

Oral and pee sedate testing can regularly recognize sedatives up to 48 to 72 hours after use.

Government specialists who command drug testing for bureaucratic workers have raised the necessary morphine cutoff focus from 300 to 2,000 g/mL to diminish the number of bogus positives because of poppy seed utilization.

NSAIDs (ibuprofen, naproxen)

NSAIDs, for example, ibuprofen, have frequently been involved in causing false positives; however, most cases are revised with another screening procedure if this is of concern. NSAIDs are effectively accessible OTC in the US and are broadly utilized. In one report, creators reasoned that full or incessant utilization of ibuprofen or interminable usage of naproxen were not generally connected with bogus positives; however, they do suggest optional testing if necessary.

Efavirenz (Sustiva)

Efavirenz doesn’t tie to cannabinoid receptors. Be that as it may, as noted in the efavirenz (Sustiva) bundle embed, bogus positive tests for cannabinoids (THC) have been accounted for when the CEDIA DAU Multilevel THC test is utilized. Counterfeit positive outcomes with other cannabinoid measures have not been watched.

False-positive tests for benzodiazepines have likewise been accounted for and are likely because of the 8-hydroxy-efavirenz major metabolite.11

Novocaine or Lidocaine

Procaine (brane name: Novocain) or lidocaine use as a resistance for cocaine misuse is undoubtedly not a legitimate reason. On the off chance that benzoylecgonine, the primary metabolite of cocaine is recognized in a medication test, the subject can’t guarantee that the outcome is a bogus positive because of Novocain organization, or some other “- caine” drug.

Benzoylecgonine is just found in nature as a metabolite of cocaine, and there would be no other substantial purpose behind its essence in a medication screen.2 As recently referenced, corroborative testing with GC-MS will distinguish singular medications or metabolites in an example, and nearly dispense with the opportunity for a bogus positive outcome.

Sertraline (Zoloft).

Sertraline (Zoloft) surpassing 150 mg/day could yield a false-positive urine test based on benzodiazepine.  Nasky looked into 522 positive outcomes for drug tests for benzodiazepines while taking sertraline. They saw 26 of 98 records as distinguished as bogus positives.

The package for sertraline currently cautions about this chance under the ‘Research centre Tests’ segment. Corroborative tests, for example, gas chromatography/mass spectrometry, help distinguish sertraline from benzodiazepines.

Passive weed smoke

Bogus Negatives

While it is hard to mess with an example, endeavours have been made to modify tests, regularly pee. Variations from the norm in the pee screen may demonstrate that outcomes might be a bogus negative or that there was purposeful degradation of the example.


A low creatinine lab worth can show that a pee test was messed with – the subject weakened their pee by devouring unreasonable water before testing, or water was added to the pee test. Creatinine levels are regularly utilized related to specific gravity to decide whether tests have been weakened.

The testing lab may be coloring the water in their can to keep the example from being diluted with can water. The temperature of pee is additionally estimated, to help forestall utilization of a subbed pee test got all things considered.

Those endeavoring to thwart the medication screen procedure may attempt to add certain chemicals to the pee test to influence dependability, yet this frequently changes the pH, which is additionally tried. TAdulterants utilized incorporate individual oxidizing operators, for example, nitrites, glutaraldehyde, chromates and an incandescent lamp like dye and iodine.

There have additionally been reports of individuals utilizing items, for instance, Visine eye drops to contaminate pee tests to cause a bogus negative outcome for THC from weed.  Addition, the additive benzalkonium chloride may diminish the grouping of 9-carboxy-THC in the underlying pee immunoassay. Nonetheless, upon corroborative testing with GC-MS, this metabolite will be present to get detected. There is the chance pH might be changed, too.

Testing for adulterants notwithstanding medications might be mentioned by the individual requiring the medication screen.

Final Thoughts

In case a positive test outcome is accounted for by a medication screening, and the benefactor confesses to utilizing drugs, no further tests should be finished. Notwithstanding, if an issue returns positive and you deny having used such drugs, a corroborative proof is required, typically Gas Chromatography-Mass Spectrometry (GC/MS).

If you’re clever, you can avoid complications by using fake urine to pass your drug test, without altering your comfortable lifestyle. The Quick Fix Synthetic Urine 6.3 Plus is a reliable fake urine option with all the same ingredients as real urine. It’s indistinguishable from the real thing.

With good-quality fake pee, you’ll no longer need to worry about those annoying drug tests.




About admin

Chris Wilder spent many years working as a part-time phlebotomist, [and yes he knows all the vampire jokes] while honing his writing skills. In 2017 he gave up playing around with blood to become a full-time writer. While dealing with blood might seem a cold and analytical vocation, his role of phlebotomist required dealing with nervous patients who needed plenty of empathy and compassion, Chris has carried this over to his written work. He believes that Quick Fix Synthetic products are the best chance of success. With his wide knowledge in this field and his understanding of how urine drug tests can affect the lives of everyday people like you and me, Chris can explain in layman's turns all the important information you need to know. In his free time, he likes to hang out with friends and check out local bands drinking a glass or two of his favorite Makers Mark Bourbon, while enjoying a recreational smoke. To keep himself in shape he takes extremely short walks with Lola, his incredibly lazy pet pug.

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