Table 5. Coagulation Assays Among Maternal Factor V Leiden Mutation Carriers and Noncarriers in the First and Second or the Third Trimesters.

	FVL Carriers		FVL Noncarriers
Assay	Trimester 1&2 (n = 79)	Trimester 3 (n = 43)	Trimester 1&2 (n = 132)	Trimester 3 (n = 126)
Antithrombin III activity	103.6 (7.7)	105.4 (7.4)	103.0 (8.2)	105.5 (8.2)
Protein C activity	118.0 (20.3)	113.5 (24.0)	118.7(24.1)	108.4 (24.3)
Protein C antigen	110.1 (17.8)	111.9 (22.3)	110.2 (18.3)	106.3 (19.9)
Protein S activity	44.5 (11.3)	36.6 (8.8)	50.4 (13.6)	41.7(13.2)
Protein S total antigen	98.0 (16.8)	100.5 (19.6)	98.8 (19.2)	94.0 (19.7)
Protein S free antigen	61.7(14.0)	51.2 (10.4)	60.6 (14.0)	52.3 (14.0)

FVL, factor V Leiden mutation.

Data are presented as mean (SD).