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Hcg Levels For Twins

Hcg Levels For Twins

HCG Levels – Know Twin Pregnancy Better

It is natural for expecting mothers to be full of questions. Since twin or multiple pregnancies are slightly different from single pregnancies, you may be filled with more questions than usual. How does a twin pregnancy differ from a single pregnancy? This, and the particulars of how HCG plays a role in it are discussed in the article below.

Connection Between HCG And Twins

HCG or Human Chorionic Gonadotropin is a hormone that helps in detecting pregnancy. For a single baby, the HCG level varies from 70 to 750 mIU/ml (i.e., milli international units per milliliter, which is a unit to measure hormones). High HCG levels can be found for twins during the early stages for pregnancy. The normal HCG levels for twins is 30% to 50% higher than in single pregnancy, somewhere around 200 to 1750 mIU/ml.

The level of HCG may double every 2-3 days in early pregnancy. Blood tests give best results when taken 7-8 days after ovulation. Most home tests can detect pregnancy 4 to 5 days before the next expected period.

Twins When HCG Is Increasing Too Fast

In most pregnancies, the normal hCG rise is at least 60% over 48 hours. In twins, it may rise much more, but it's not possible to diagnose a twin pregnancy just from the hCG levels alone. The hCG can rise manyfold even without twins.

    1. In most normal pregnancies at hCG levels below 1,200 mIU/ml, the hCG level usually doubles every 48-72 hours, and it normally increases by at least 60% every two days.
    2. In early pregnancy, a 48-hour increase of hCG by 35% can still be considered normal.
    3. As your pregnancy progresses, the HCG level increase slows down significantly.
    4. Between 1,200 and 6,000 mIU/ml serum, the hCG level usually takes 72-96 hours to double.
    5. Above 6,000 mIU/ml, the hCG levels often take over four or more days to double.
    6. In general, when the hCG level reaches 7200 mIU/ml, a yolk sac should be seen.
    7. At an hCG level greater than 10,800 mIU/ml, there should be a visible embryo with a heartbeat.

Twin pregnancy HCG levels

When a mother is carrying a twin pregnancy, she generally has higher hCG levels than a woman who is pregnant with one baby. But this is not a guarantee; there is a big cross over between singleton and twin pregnancy hCG levels and between individual women. Comparison is generally not helpful.

In general, pregnant women do not know what their individual hCG levels are. They know they are pregnant from their own clinical judgement and because they’ve either confirmed this with a home pregnancy test or their pregnancy has been confirmed by their health care provider. Home pregnancy tests do not give a precise reading of hCG levels, they only detect whether hCG is present or absent in the sample. However, for women who are undergoing fertility assistance and have regular blood tests, moitoring their hCG levels is likely to be an easier process because of pathology results.

In women who are having a multiple pregnancy, it is common for their hCG levels to be 30-50% higher than those with a singleton pregnancy. But this elevation is not evident until after the first period is missed.

A very rapid increase in hCG levels can be cause for concern. When an embryo implants in the ovary or, there is a rapid growth of either placental tissue/ not foetal, then high hCG levels can reflect this. There are also some types of (very rare) cancers which can impact on hCG concentrations.