Table 1

Dosage of anti-D IG for RhD negative women⁹

Potential sensitising event during pregnancy^1-150	Anti-D 1g dose
Prior to 20 weeks’ gestation	250 iu
Later than 20 weeks’ gestation	500 iu^1-1
Post-delivery of Rh D positive infant	500iu^1-1

↵1-150 eg abdominal trauma, abortion, amniocentesis, antepartum haemorrhage, chorionic villus sampling, ectopic pregnancy, external cephalic version, termination of pregnancy.
↵1-1 A Kleihauer test should be undertaken, as a larger dose may be required.