A member asked:

I'm on day 16 of my cycle and after having 3 positive ovulation tests - i've had 2 positive hpt's. is this possible after a normal period 2 weeks ago?

A doctor has provided 1 answer

Cross reaction: You must not be using very good pregnancy tests. If they are testing for HCG, there is some cross reactivity to the hormone FSH, which is high around ovulation. Tests that are specific for the β subunit of HCG (βHCG) do not cross react, so are more accurate.

Answered 6/27/2014

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Thank

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