Accuracy of dating pregnancy tests
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Hc G is a hormone detectable in pregnant women’s blood or urine about 10 days post-conception; it increases at a rapid rate, peaking about 10 weeks into the pregnancy.
Early pregnancy tests can now be taken several days before your period is due – but the earlier you take the test, the less reliable the result.
The number of days varies according to the make of pregnancy test.
This may be one reason why the Clearblue digital pregnancy tests have been documented to have an abnormally high rate of false positives. Other causes of false positives include taking certain fertility medications, hormones left over from a recent pregnancy, or in some cases by menopause or ovarian cysts.
For women carrying twins, the test can indicate that the pregnancy is more advanced than is actually the case.