Journal of Thyroid Research / 2011 / Article / Tab 3

Research Article

First- and Second-Trimester Reference Intervals for Thyroid Hormones during Pregnancy in “Rhea” Mother-Child Cohort, Crete, Greece

Table 3

Comparison between reference ranges for thyroid hormones as calculated by our analysis and those proposed by the manufacturer.

Reference rangesTSH ( IU/mL)free T4 (ng/dL)free T3 (pg/mL)
1st trimester2nd trimester1st trimester2nd trimester1st trimester2nd trimester

Rhea cohort0.05–2.530.18–2.730.95–1.530.87–1.451.54–5.221.78–5.29
Manufacturer0.4–40.89–1.761.8–4.2

TSH: thyroid-stimulating hormone; free T3: free triiodothyronine; free T4: free thyroxine.

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