Pregnancy test dating
“Through our consumer research, we found consumers were really wanting more information at the beginning of pregnancy. But not all women keep accurate track of their periods, and many have irregular cycles, so these dates aren’t always reliable for dating pregnancies.
In fact, 78% of women in our research study feel that knowing how far along you are at the beginning of pregnancy is very important,” says Ryan Daly, the Marketing Director at Procter & Gamble, which makes the test. Ultrasounds can improve on the accuracy, based on doctors’ assessments of the baby’s development, but these images typically aren’t useful until the woman is at least eight weeks along.
Home pregnancy tests detect human chorionic gonadotropin (h CG) in urine.
Human chorionic gonadotropin is a hormone produced by the placenta early in pregnancy.
Consequently, the embryo is about 2 weeks younger than the number of weeks traditionally assigned to the pregnancy.
In other words, a woman who is 4 weeks pregnant is carrying a 2-week-old embryo.
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 (h CG), that appears after fertilization.
The Food and Drug Administration approved the kit for market in December 2012, and starting September 1, the test will have widespread availablity to American women in all major retailers.The calculated due date is October 8 the next year.Only 10% or fewer of pregnant women give birth on the calculated date, but 50% give birth within 1 week, and almost 90% give birth within 2 weeks (before or after the date).The first test may have been done too early (before the next menstrual period is expected to start).If results are positive, the woman should contact her doctor, who may do another pregnancy test to confirm the results.
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These levels can be measured during the pregnancy to determine whether the pregnancy is progressing normally.