International Scholarly Research Notices / 2013 / Article / Tab 2

Clinical Study

A Longitudinal Study of Changes in Thyroid Related Hormones among Pregnant Women Residing in an Iodine Deficient Urban Area

Table 2

Distribution of lower or higher thyroid function tests in pregnant women as compared to the normal ranges of nonpregnant women.

Thyroid hormone1st trimester
2nd trimester
3rd trimester

FT4 (11.0–22.0 pmol/L)*
 Low value53 (20.9)67 (26.4)60 (23.6)
 High value5 (2.0)00
FT3 (2.5–5.8 pmol/L)
 Low value7 (2.8)00
 High value18 (7.1)13 (5.1)22 (8.7)
TSH (0.3–4.0 mIU/L)
 Low value37 (14.6)7 (2.8)0
 High value5 (2.0)6 (2.4)14 (5.5)

Normal range derived as 95% confidence interval.

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