TYPE, RH, AND ANTIBODY
SCREENING
The patient’s blood type and Rh is determined with the direct Coombs test. If
the patient is Rh-negative, she is at risk for anti-D isoimmunization.
The presence of atypical RBC antibodies is determined with the indirect
Coombs test (or atypical antibody test [AAT]). Isoimmunization is identified
if atypical antibodies are present. Follow-up testing is necessary to identify
whether the fetus is at risk.http://ebookobgyne.net