hCG (human chorionic gonadotropin) is a hormone produced by the placenta during pregnancy. Home pregnancy tests (HPTs) and Blood serum tests are designed to detect it. hCG is detectable in the blood of pregnant women by 8-10 days after ovulation and the majority by 12 days past ovulation. This is when the embryo burrows itself into the lining of the uterus. This is also know as implantation. HCG rises progressively from conception. Levels double on the average, every 31-48 hours as the embryo grows until values reach 6500 mIU/ml (6,500 IU/L) at approximately the eighth week after the last menstrual period (LMP). After that the rate of rise becomes individualized, peaking between the 60th and 70th day (9 to 10 weeks) LMP (Last Menstrual Period). HCG decreases slightly between the 12th and 16th week post LMP, and then remains constant until birth.
HCG levels in normal pregnancy
Days Past Ovulation
7 Days - 5-50 (avg. 14)
14 Days - 5-50 (avg. 21)
21 Days - 5-50 (avg. 42)
28 Days - 10-425
35 Days - 19-7,340
42 Days - 1,080-56,500
7-8 weeks - 7,650-229,000
9-12 weeks - 25,700-288,000
13-16 weeks - 13,300-254,000
17-24 weeks - 4,060-165,400
25-40 weeks - 3,640-117,000
Normal Twin Pregnancy
Day after LH/HCG
14 Days - 68-313
15 Days - 38-159
16 days - 146-803
17 Days - 154-542
18 Days - 360-1760
19 days - 499-2509
21 Days - 963-5859
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