A 34-year-old healthy gravida 2 para 1 presented after an uncomplicated pregnancy at term with a 2-day history of diminished fetal movements. Fetal anemia was suspected by fetal heart rate monitoring and Doppler estimation of the fetal peak blood flow velocity of the middle cerebral artery. We were also fortunate to register pathological ST waveform changes of the fetal ECG indicating fetal hypoxia. The diagnosis of a massive feto-maternal hemorrhage was confirmed by an extremely high fraction of erythrocytes containing fetal hemoglobin in maternal blood and, after delivery, by placental histology.
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