What over the counter pregnancy tests are most accurate?
—————————————– From Robbrenner@aol.com (Robert Brenner MD) 2. HCG is human chorionic gonadotropin. It is secreted by the placenta and is measured by pregnancy tests. Urine pregnancy tests can turn positive as early as 2 days after a missed period. I recommend doing a urine pregnancy test when 1 week late for the period to lesson the incidence of false negative results. Serum pregnancy tests can turn positive around the time of the missed period but again I wait til the patient is 1 week late to avoid false negative results. Essentially all over the counter pregnancey tests are the same. In a normal pregnancy HCG levels should double every 3 days. This is measured by quantitative serum HCG tests.
