Adenosine Triphosphate. Adenosine triphosphate (ATP) is considered by biologists to be the energy currency of life. It is the high-energy molecule that stores the energy we need to do just about everything we do.denosine Triphosphate. Adenosine triphosphate (ATP) is considered by biologists to be the energy currency of life. It is the high-energy molecule that stores the energy we need to do just about everything we do.
1 Home tests are sometimes done too soon after the missed menstrual cycle to result in a positive test. It typically takes 10 days after a missed menstrual period before the presence of hCG can be detected by the urine test.  All urine hCG tests should be done on a first morning urine sample, if possible.
How many days after a miscarriage would it take for a urine pregnancy test to show a negative result? Urine hCG decreases at about the same rate as serum hCG, which can take anywhere from 9 to 35 days, with a median of 19 days. However, the timeframe for when an hCG result will be negative is dependent on what the hCG level was at the time of the miscarriage.