Reasons you may not be able to
have the test or why the results may not be helpful include:
Having a blood transfusion in the
Being pregnant within
the past 3 months.
Taking some medicines, such as cephalosporins,
sulfa medicines, tuberculosis medicines, insulin, and tetracyclines.
What To Think About
A newborn baby (whose mother has
Rh-negative blood) may have a direct Coombs test to
check for antibodies against the baby's red blood cells. If the test is
positive, the baby may need a transfusion with compatible blood to prevent