Table 3.

Concentration of total hCG and in 4246 urine samples from 574 women having term pregnancies measured using the Siemens Immulite 1000 total hCG assay.

Gestation age (weeks since start of menstrual period)	N	Median Total hCG ng/ml	Range Total hCG ng/ml (variation)	Variance
3-weeks-3-weeks 6-days	n = 574	0.24 (255 of 574 <0.1 ng/ml)	0 - 415
4 weeks-4 weeks 6-days	n = 574	21.7 (20 of 574 <0.1 ng/ml)	0 - 213
5 weeks-5-weeks 6-days	n = 574	301.2	2.3 - 4,195	1839X
6-weeks-6-weeks 6-days	n = 574	1,472	14.1 - 24,580	1743X
7 weeks-7 weeks 6-days	n = 574	4,795	93.1 - 28,370	305X
8 weeks-8 weeks 6-days	n = 574	6,813	124.5 - 42,120	338X
9 weeks-9 weeks 6-days	n = 65	8,869	134.5 - 54,530	405X
10 weeks-10 weeks 6-days	n = 45	9,864	123.4 - 60,130	487X
11 weeks-13-weeks 6-days	n = 74	1,984	179.3 - 49,540	276X
14 weeks-17 weeks 6-days	n = 494	768.8	58.5 - 8,411	143X
18 weeks-26-weeks 6-days	n = 74	506.3	84.0 - 2,643	31.5X
27 weeks-40 weeks 6-days	n = 50	522.4	66.1 - 1,873	28.3X

Data from a further 97 pregnancies that failed (miscarriage) were excluded from this table. Pregnancies which failed to implant in early pregnancy (total hCG <0.1 ng/ml) are indicated in parenthesis.