What is pregnancy reference ranges for TSH?

The 2011 American Thyroid Association (ATA) guidelines recommended that the interpretation of thyroid function in pregnancy be based on trimester specific reference ranges: TSH values should be 0.1-2.5 mIU/L (first trimester), 0.2-3.0 mIU/L (second trimester), and 0.3-3.5 mIU/L (third trimester)(1).

What is the normal range of T4 during pregnancy?

For Free T4, the trimester specific reference ranges were 0.8–1.53, 0.7–1.20 and 0.7–1.20 ng/dL for first, second and third trimesters, respectively. The reference ranges for total T4 for the first, second and third trimesters were 7.31–15.0, 8.92–17.38, and 7.98–17.70 μg/dL, respectively.

What happens if you have thyroid during pregnancy?

KEY POINTS. The thyroid makes hormones that help your body work. If it makes too little or too much of these hormones, you may have problems during pregnancy. Untreated thyroid conditions during pregnancy are linked to serious problems, including premature birth, miscarriage and stillbirth.

Is TSH 6 high during pregnancy?

Main text. Various studies have demonstrated that with the use of fixed TSH upper limits, 8–28% of pregnant women have a TSH concentration that is considered too high [5, 6].

Can high TSH levels cause infertility?

Too much thyroid hormone caused by hyperthyroidism can affect fertility by: Disrupting the menstrual cycle. Causing a reduction in sperm count. Increasing the risk of early-term miscarriage.

Does TSH mean your pregnant?

TSH test. If a pregnant woman’s symptoms suggest hyperthyroidism, her doctor will probably first perform the ultrasensitive TSH test. This test detects even tiny amounts of TSH in the blood and is the most accurate measure of thyroid activity available. Generally, below-normal levels of TSH indicate hyperthyroidism.

Is pregnancy safe with hypothyroidism?

Hypothyroidism can also interfere with the development of an embryo (fertilized egg). This increases the risk of miscarriage. Also, if you are pregnant and your hypothyroidism is not treated, your baby may be born prematurely (before the predicted due date), weigh less than normal, and have lowered mental capacity.