WALTHAM, Mass., Oct. 31 (UPI) -- A U.S. home pregnancy test can detect not only if a woman is pregnant, but how far along she is with 93 percent accuracy, says Procter & Gamble and Alere.
The $16 test Clearblue Advanced Pregnancy Test with Weeks Estimator, available in Europe since 2008, but approved by the U.S. Food and Drug Administration last December measures the levels of the hormone human chorionic gonadotropin, or hCG, in urine.
The test has two strips, one to determine if a woman is pregnant and the other estimates the number of weeks since ovulation. The second strip measures spikes in a woman's hCG levels to determine how long a woman is pregnant, The Wall Street Journal reported.
SPD Swiss Precision Diagnostics GmbH, of Geneva, a joint venture of Procter & Gamble Co. and Alere Inc., conducted a study on 146 women and found it 93 percent accurate, but only in single births, not multiple births.
The study was published in the September in the journal Fertility and Sterility.
