In a normal pregnancy,
the levels of thyroid hormone (T3 and T4) increase due to the increase in the hormone estrogen.
Due to changes in T4 and TSH
levels in pregnancy, normal ranges
specified for each trimester of pregnancy
(
every 3 months),” says Dr A Sharda, Consultant, Endocrinologist
Diabetologist, Manipal Hospital Millers Road. Therefore,
it is crucial to use trimester-specific ranges for total
when diagnosing hypothyroidism
during pregnancy, to account for the normal hormonal
If the diagnosis is based on specific quarterly
ranges, diagnosing the conditions is no longer a challenge.
The diagnosis of hypothyroidism is based on
the measurement of the levels of thyroid hormones
pregnancy is considered normal. But, a TSH
greater than 10 mIU/L with a low or norma
If the TSH level is between 2.5
and 10, it is called subclinical hypothyroidism. “Subclinical hypothyroidism
Due to changes in T4 and TSH
levels in pregnancy, normal ranges
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