Table 1.

hPLAP activities in noninactivated (NI) and heat-inactivated (I) pregnant serum measured by ICA-PLAP and ICA-PEP.

Serum sample	Patient age (years)	Time of pregnancy (weeks)	ICA-PLAP hPLAP (U/L)		ICA-PEP hPLAP (U/L)
			NI	I	NI	I
1	35	12	0.1	0.1	0.1	0.2
2	33	18	1.58	1.7	2	2.5
3	28	27	33	35.5	36	35.5
4	26	32	31	31	34	32
5	24	33	51.5	49	53	52
5	32	35	42	44	40.2	43
6	27	37	43	42	41	44