Hospitals’ initial urine- screening drug tests on pregnant women can produce a high rate of false positives – particularly for methamphetamine and opiates – because they are technically complex and interpretation of the results can be difficult, some experts say. 29 июн. 2008 г. Hospitals’ initial urine- screening drug tests on pregnant women can produce a high rate of false positives – particularly for methamphetamine and opiates – because they are technically complex and interpretation of the results can be difficult, some experts say.

Can pregnancy cause a false positive drug test?

Conclusion: In pregnant women requiring labetalol for treatment of hypertensive disease, a urine drug screen may be falsely positive for amphetamines and methamphetamines. Providers should be cognizant of this possibility when interpreting the results of urine drug screens.

What can cause a false positive on a urine drug screen?

Drugs that can cause false positives1) Dextromethorphan. Dextromethorphan is an active ingredient in Robitussin, Delsym, and other over-the-counter cough suppressants. … 2) Diltiazem. … 3) Diphenhydramine. … 4) Metformin. … 6) Labetalol. … 9) Tramadol. … 10) Phentermine. … 11) NSAIDs.These 14 Medications Can Cause a False Positive on Drug Tests

Can hCG cause a positive drug test?

Typically, it takes about 10 days for the drug hCG to clear from blood and urine. So, if you do an UPT too soon — 10 days or less after the hCG injection — you may get a false positive because you are detecting the medication that is still in your blood and urine, not the hCG that a pregnancy is making.

How common is false positive pregnancy test?

The good news for prospective testers is that the chances of a false positive pregnancy test are very low. So just how common are false positive pregnancy tests then? “False positive pregnancy tests are rare and occur less than 1 percent of the time,” confirms DuMontier.

What drugs can cause a false positive pregnancy test?

1 Neurological Drugs Anti-psychotics, anti-convulsant, and anti-anxiety medications may cause a false positive test. Examples include diazepam, clozapine, phenobarbital, alprazolam, and chlorpromazine. 2 Anti-Parkinson’s Drugs Anti-Parkinson’s drugs may also affect the results of pregnancy tests. These drugs include Bromocriptine. 3 Diuretics

Why do drug tests for pregnant women fail so often?

Hospitals’ initial urine- screening drug tests on pregnant women can produce a high rate of false positives – particularly for methamphetamine and opiates – because they are technically complex and interpretation of the results can be difficult, some experts say.

Can a new mom get a false positive drug test?

False positives are common in drug tests on new moms. Hospital doctors have the discretion whether to request an initial urine screen and usually do so only if the mother exhibits signs of drug use, the baby is born premature or underweight, or other reasons occur.

Can a home pregnancy test give a false positive?

Certain medical conditions Rarely, certain medical conditions can cause a home pregnancy test to give a false positive. These include: A positive at-home pregnancy test result should always be followed up with a doctor’s appointment. Your doctor may give you a urine or blood test to confirm the results and monitor your hCG levels.