14dpt – Beta HCG 521

November 9, 2010

I did #2 Beta today and HCG level is 521. Nice and strong. 🙂

My HCG level is a little bit high at this stage – about 3 times higher than 3 days ago. We are not sure if it will be one or two or even three babies growing in my uterus- we transferred 3 3-day embryos. I did some online search regarding HCG levels in single and twin pregnancies.

HCG levels in pregnancy

HCG, or human chorionic gonadotropin, is a hormone made by the pregnancy that can be detected in the mother’s blood or urine even before the woman’s missed period. This hormone is what we look for with a “pregnancy test”.

HCG is first detectable in the blood as early as 7-8 days after ovulation by very sensitive HCG assays (research assays). In real life, blood pregnancy tests will be positive (> 2 mIU/ml) by 10-11 days after HCG injection or LH surge.

In general, the HCG level will double every 2-3 days in early pregnancy.

85% of normal pregnancies will have the HCG level double every 72 hours.

HCG levels peak at about 8-10 weeks of pregnancy and then decline, remaining at lower levels for the rest of the pregnancy.

There is a large variation in a “normal” HCG level for any given time in pregnancy.

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

HCG levels from normal twin pregnancies

Twin pregnancies tend to show higher HCG levels on a given day of pregnancy. However, there is a large variation in HCG levels between pregnancies, and great overlap exists between single and twin pregnancies.

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

The information in the table above is part of a study carried out by Dr. Sherbahn that compared HCG levels from single, twin and heterotopic (combined intrauterine and ectopic) pregnancies.

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