Could Blood Test for Pregnancy Be Wrong?

As with urine/home pregnancy tests, it is possible to end up with false results (both negative and positive) from a blood pregnancy test. A false negative (test is negative, but you're pregnant) can occur if the blood pregnancy test was performed too early.

How early can a blood test detect pregnancy?

Blood tests

They can pick up hCG earlier in a pregnancy than urine tests can. Blood tests can tell if you are pregnant about six to eight days after you ovulate. Doctors use two types of blood tests to check for pregnancy: Quantitative blood test (or the beta hCG test) measures the exact amount of hCG in your blood.

What can cause a false-negative blood pregnancy test?