August 29th, 2013
For more than 30 years, DIY pregnancy tests have been the first hint for women about whether or not they are expecting. And now they may also have the power to reveal how far along the pregnancy is.
Here’s how it works. The Clearblue Advanced Pregnancy Test with Weeks Estimator contains two strips instead of the standard single strip. Both strips measure a hormone women produce when they are pregnant, called human chorionic gonadotropin (hCG), that appears after fertilization. hCG levels increase significantly in a woman’s urine during the early weeks of pregnancy, and start to decline 11 weeks into the pregnancy. Like standard pregnancy tests, the new one measures hCG levels. But the second hCG detection strip uses the hormone to estimate the length of the pregnancy based on time since ovulation. If a woman is indeed pregnant, the test will read: “Pregnant,” as well as list either: 1-2, 2-3 or 3+ to indicate by how many weeks.