Quantitation, in pregnancy, of any 2 of the following to detect foetal abnormality - total human chorionic gonadotrophin (total HCG), free alpha human chorionic gonadotrophin (free alpha HCG), free beta human chorionic gonadotrophin (free beta HCG), pregnancy associated plasma protein A (PAPP-A), unconjugated oestriol (uE3), alpha-fetoprotein (AFP) - including (if performed) a service described in item 73527 or 73529 - Applicable not more than once in a pregnancy