As with home urine tests, it is possible, although rare, to end up with false results (both negative and positive) from a blood pregnancy test. Can You Get a False Negative on a Blood Pregnancy Test?

Pregnancy tests with blue or pink dye typically show one line if the result is negative and two if hCG ... "the majority of people don't need a blood pregnancy test to confirm they are pregnant.

Problems arise only with Rh-negative mothers and Rh-positive babies. Usually the first pregnancy goes fine ... Otherwise, when they have blood tests, they might wrongly assume that they have ...

To address this gap, the researchers restricted their study to 136 women who were not depressed during pregnancy and measured ... for pregnant women whose blood tests reveal neuroactive steroid ...