The focus of monitoring in diabetic pregnancy is no longer the prevent
ion of fetal mortality, owing to the impressive benefits of strict mat
ernal glucose control. Against this background, fetal monitoring must
account for congenital anomalies, fetal mortality and severe morbidity
as a result of metabolic consequences of hyperinsulinism, the exponen
tial effect of diabetes when other maternal complications are present,
and peripartum problems of the macrosomic infant, of delayed lung mat
uration, birth trauma and neonatal hypoglycemia. Thus, a broad range o
f potential fetal problems with varying maternal complications require
s individualized, serial observation with multiple-format, properly va
lidated tests. There has been recent progress: definition of the popul
ation at risk, clarification of pathophysiology, application of multip
le-format tests, and evaluation of neonatal impacts; further precision
may be developed with specific fetal tests. This review deals with th
e continued fine tuning of this critical area of perinatal medicine.