A new cord blood factor has been suggested as a measure of the seventy of haemolytic disease of the newborn at birth. One hundred and seventy three cases of Rhesus iso-immunisation have been classified as mild, moderate and severe according to the readings of Optical Density Difference of bilirubin in the liquor amnii and correlated with the cord blood haemoglobin, cord blood serum bilirubin, and the new cord blood factor. The new cord blood factor gave the best correlation.
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