With 0.3% fetal cells observed in the maternal circulation, the estimated fetal whole blood volume ranges from 10.8 to 31.6 mL.
What is a fetomaternal hemorrhage?
Fetomaternal hemorrhage refers to the entry of fetal blood into the maternal circulation before or during delivery. Very small amount of fetal red cells are normally detectable in all pregnancies.
What is the Kleihauer-Betke test used for ?
A Kleihauer-Betke test is used to quantitative the number of fetal Rh-positive cells in the maternal circulation as a result of fetomaternal hemorrhage.
When does fetomaternal hemorrhage occur?
Fetomaternal hemorrhage (FMH) is defined by the transfer of fetal blood into the maternal circulation during pregnancy. It occurs in the majority of pregnancies, usually without any maternal or fetal risk factors or consequences.
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