Can letting urine sit in water have it come out diluted for a pregnancy test?

Answer 1

There are several things that can contribute to a negative pregnancy test even if you are pregnant. Some medications can give you a false negative, the timing of the test can affect the results. If you did not follow directions properly; if you let the test sit for too long the results may read negative after a while. It is important to read the results within the amount of time given on the instructions of that particular pregnancy test you bought. If you did not perform the test properly you can get a false negative.

To ensure the best results for a home pregnancy test:

• Take the test first thing in the morning, if possible, because your hCG (pregnancy hormone) levels are at it's highest
• Take the test no more than 1 day before expected period. OR 14 days after intercourse (sex). Although some test say that you can see results up to 5 days before your missed period, the percentage of accuracy is very low.
• urinate for as long as possible on the foam-like strip
• Check the results in the window frame of time suggested by the instructions of the pregnancy test.

On rare occasions you can encounter a false positive due to improper testing, expired pregnancy tests, rare medical conditions such as certain types of cancer, evaporation lines, a recent pregnancy or a chemical pregnancy.

However, in a 1998 study titled "Effect of low urine specific gravity on pregnancy testing.", the authors concluded that "current sensitive immunoassay tests for human chorionic gonadotropin (HCG) are highly sensitive and that low specific gravity [of urine] does not appear to alter this sensitivity."

Answer 2

Adding in water to urine will dilute the urine and all components in the urine. It can make pregnancy hormones less detectable. But why would you dilute your urine purposely and waste a HPT product?