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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