Human Reproduction, Vol. 15, No. 1, 218-221,
January 2000
© 2000 European Society of Human Reproduction and Embryology
Fetal cells in maternal blood of pregnancies with severe fetal growth restriction
1 Harris Birthright Research Centre for Fetal Medicine, King's College School of Medicine and Dentistry, London SE5 8RX and 2 Department of Haematological Medicine, King's College Hospital, London, UK
The aim of this study was to examine whether, in pregnancies with severe early onset fetal growth restriction, the number of fetal erythroblasts in maternal blood is increased. The percentage of fetal erythroblasts in maternal blood, enriched by triple density gradient centrifugation and anti-CD71 magnetic cell sorting, was determined in 10 singleton pregnancies with severe intrauterine growth restriction in which there was Doppler ultrasound evidence of impaired placental perfusion. The values were compared to those of 10 normal pregnancies at the same gestational range of 22–26 weeks. In the growth restricted pregnancies the median number of fetal erythroblasts per 100 nucleated cells in maternal blood enriched for fetal cells was significantly higher than the median value in the control pregnancies (8.5% compared with 1%; P < 0.001). These data suggest that impaired uteroplacental perfusion and severe fetal growth restriction may be associated with placental damage leading to increased feto-maternal cell traffic. Alternatively the rate of transfer of fetal cells into the maternal circulation is not altered but in growth restriction the proportion of fetal erythroblasts in fetal blood is increased.
Key words: Doppler ultrasound/fetal cells in maternal blood/fetal growth restriction
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