If there is a substantial amount of hCG in your body, it passes on to your urine and gives you a positive pregnancy test(1). A false positive, or a positive HPT without being pregnant is rare.

It can cause a false positive result or a ... of people don't need a blood pregnancy test to confirm they are pregnant. And in fact, our[doctors'] urine tests are exactly the same as the ones ...

The most commonly used tests to screen urine for drugs of abuse are immunoassays, even though false-positive results for drugs of abuse have been reported with a number of these rapid-screening ...

So far, no quantitative urine bilirubin test method is commercially available. The only way to exclude urine-strip false-positive bilirubin outcomes is with a confirmatory assay like Ictotest tablets.