Intrapartum fetal asphyxia with morbidity or mortality, although an infrequ
ent occurrence, is important because of the serious implications of this co
mplication. The benefits of intrapartum fetal surveillance by predictive fe
tal heart rate (FHR) patterns have not been established; however, harm may
occur because of unnecessary intervention. Prediction of most cases of intr
apartum fetal asphyxia by FHR patterns is possible but difficult. Because o
f the large number of false-positive FHR patterns, supplementary tests are
essential. Until additional fetal assessment tests are validated, blood gas
and acid-base assessment of fetal blood is the test that can provide a def
initive diagnosis and identify false-positive predictions.