2025-01-13
Flaw in many home pregnancy tests can return false negative results
Pregnancy tests can sometimes give a false negative result to women several weeks into their pregnancies, according to research by Ann Gronowski, PhD, a professor of pathology and immunology at Washington University School of Medicine in St. Louis. Her findings led the FDA to change its standards for evaluating new pregnancy tests, but old tests with the false-negative problem are still on the market.