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  • Title: Serial fetal blood sampling for the management of pregnancies complicated by severe rhesus (D) isoimmunization.
    Author: MacKenzie IZ, Bowell PJ, Castle BM, Selinger M, Ferguson JF.
    Journal: Br J Obstet Gynaecol; 1988 Aug; 95(8):753-8. PubMed ID: 3139022.
    Abstract:
    Fifty-one pregnancies complicated by rhesus (D) isoimmunization have been managed by serial fetal blood sampling between 17 and 36 weeks gestation as an alternative to amniocentesis for delta OD453 measurements. In 36 pregnancies where the fetus was shown to be rhesus (D) positive and both measurements were made before any intrauterine fetal transfusions, the delta OD453 value gave misleading predictions on 13 of 63 occasions (21%). Fetal haematocrit estimations provided a direct assessment of the haemopoietic compensation occurring, but fetal bilirubin and albumin concentrations did not correlate directly with disease severity. It is proposed that pregnancies complicated by severe isoimmunization can be more precisely managed by serial fetal blood sampling for haematocrit estimation than amniocentesis for delta OD453 measurement thus avoiding unnecessary intervention or delayed treatment.
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