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HCG LEVELS IN PREGNANCY

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 during Pregnancy

Days Past Ovulation

Normal HCG Levels:
MIU/ML

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

 

Source: http://www.advancedfertility.com/earlypre.htm  

NORMAL SINGLE PREGNANCIES

Day after HCG or LH

Average
mIU/ml

High
mIU/ml

Low
mIU/ml

#

14

48

119

17

12

15

59

147

17

18

16

95

223

33

23

17

132

429

17

21

18

292

758

70

19

19

303

514

111

23

20

522

1690

135

13

21

1061

4130

324

12

22

1287

3279

185

22

23

2034

4660

506

13

24

2637

10000

540

16

NORMAL TWIN PREGNANCIES

Day after LH or HCG

Average
mIU/ml

High
mIU/ml

Low
mIU/ml

#

14

68

313

56

7

15

38

159

26

9

16

146

803

112

12

17

154

542

52

8

18

360

1760

200

9

19

499

2509

215

13

21

963

5859

631

10

 
 
 

 

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