TWIN HCG LEVEL :
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 much overlap exists between single and twin pregnancies.

Levels are listed for various days after the ovulatory HCG injection or LH surge
First (same as Third) International Reference Preparation was used (Second IRP gives different values)
"High" is highest seen in this group of pregnancies
"Low" is lowest seen in this group of pregnancies
"#" is the number of tests done for that day in this group of pregnancies

These values are from a group of 29 normal twin pregnancies (a small group)
Because this is a very small group of patients and because lab assays vary, it is important not to rely on these values to try to determine whether your pregnancy is viable, single, twin, etc.

The information in the above is part of a study of compared HCG levels from single, twin and heterotopic (combined intrauterine and ectopic) pregnancies.