human chorionic gonadotrophin ( hcg ) was estimated by radioreceptor assay ( rra ) , and beta hcg and pregnancy-specific beta 1 glycoprotein ( sp-1 ) by radioimmunoassay ( ria ) in 48 consecutive patients undergoing laparoscopy for suspected ectopic pregnancy .
C0018062
human chorionic gonadotrophin
C0106132
beta hcg