Tag: False positive

The Cologuard test has a false-positive rate of about 13% [1.6.2]. While the test does not require medication changes, understanding what medications can cause a false positive Cologuard test is crucial for interpreting results, as some drugs can cause non-cancerous gastrointestinal bleeding [1.4.3, 1.5.7].

In clinical and forensic settings, immunoassay is widely favored as a fast and cost-effective method for preliminary toxicology screenings, with some variations of the test providing results in just minutes. This technique is so commonplace that it is the answer to the question: **What is a commonly used screening technique in toxicology?**.

According to the FDA drug label, phenazopyridine can interfere with urinalysis based on color reactions and spectrometry, potentially leading to misleading results. This common over-the-counter medication, often used for urinary tract infection symptoms, can cause a false positive, complicating diagnosis if not properly disclosed.

According to a 2023 case study published in the journal *Case Reports in Emergency Medicine*, the use of fexofenadine has been associated with false-positive results for tramadol on urine immunoassay screens. This highlights that while unlikely for most standard panels, the answer to 'Can fexofenadine make you fail a drug test?' is not a simple 'no' and depends heavily on the specific test and substance being screened.

Many standard mouthwashes contain alcohol levels higher than beer or wine, presenting a potential complication for individuals with a Secure Continuous Remote Alcohol Monitor (SCRAM) bracelet. Navigating oral hygiene while wearing such a device requires careful attention to product ingredients to avoid triggering false alarms and jeopardizing compliance.

Many common mouthwashes contain a significant amount of ethyl alcohol, with some brands having up to 30% [1.2.1, 1.3.2]. This raises a critical question for many drivers: **Can mouthwash set off interlock** devices and lead to a failed breath test?

According to toxicology data, a small amount of pharmaceutical codeine is metabolized into morphine, meaning both can appear in a drug screen. Understanding **what drugs show up as codeine** is critical for interpreting results accurately, as other substances and even certain foods can trigger a positive test.

In 2023, 11.4% of U.S. adults reported taking prescription medication for depression [1.7.1]. For many, this raises a critical question: **Will Prozac show up on a drug test** and could it affect employment? This article explores the answer.

Antidepressants are among the most commonly prescribed medications in the U.S., which often leads patients to question how their treatment might impact medical procedures, such as urinalysis. The short answer to whether **Lexapro affect urinalysis?** is that while the medication is detectable in urine, it typically does not interfere with standard drug screens designed to detect illicit substances.

According to research, a significant portion of false-positive amphetamine urine drug screens in some populations is caused by therapeutic bupropion use, the active ingredient in the antidepressant Wellbutrin. This medication can also affect urine in other ways, including its excretion and potential urinary side effects.