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Results of home pregnancy tests are accurate about 97% of the time.If results are negative but the woman still suspects she is pregnant, she should repeat the home pregnancy test a few days later.
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).
If a woman’s periods are irregular, the actual difference may be more or less than 2 weeks.
Pregnancy lasts an average of 266 days (38 weeks) from the date of fertilization (conception) or 280 days (40 weeks) from the first day of the last menstrual period if the woman has regular 28-day periods.
Clearblue’s clinical trials included 2,000 women and 5,000 tested urine samples and determined that h CG measurement was effective and accurate for estimating the time since a woman’s last ovulation.
The company says the test is 99% accurate at detecting pregnancy from the day of a woman’s expected period, and about 93% accurate in estimating the number of weeks. Consumers have been looking for more information and answers in the pregnancy test category and there hasn’t been any innovation since the digital pregnancy test was launched.” To estimate how far along a woman is, doctors typically work off the date of her last menstrual period, as well as an ultrasound reading to document physical changes in the womb that can date a pregnancy.
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The Clearblue Advanced Pregnancy Test with Weeks Estimator contains two strips instead of the standard single strip.