A false-negative test result is one that does not detect what is
being tested even though it is present. A false-negative test result may thus
suggest that a person does not have a disease or condition being tested for
when in fact he or she does.
For example, a false-negative pregnancy test result would be one
that does not detect the substance (human chorionic gonadotropin) that would
confirm pregnancy, when in reality the woman is pregnant.
Anne C. Poinier, MD - Internal Medicine & Thomas M. Bailey, MD - Family Medicine