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Is it possible for the predictor to be negative and the blood pregnancy test to be positive?

By Andrea Rodrigo B.Sc., M.Sc. (embryologist).
Last Update: 03/25/2022

Yes, it is possible due to the different sensitivity of both tests. Urine tests detect hormone levels higher than 20 or 50 mIU/ml, depending on the type of test we buy. On the contrary, in the blood test, we can detect lower values. Therefore, if we use a 50 sensitivity predictor and the concentration of beta-hCG hormone in our body is 30, the predictor will be negative and the blood pregnancy test will be positive.

 Andrea Rodrigo
Andrea Rodrigo
B.Sc., M.Sc.
Embryologist
Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.
Embryologist. Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.