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Figure 14-9 Gestation-related reference intervals for serum TSH in a Chinese population (343 healthy pregnant women & 63 non-pregnant controls). The median, 2.5th and 97.5th percentiles for serum TSH values are shown in the blue boxes for each trimester. Gestation-specific reference intervals for TSH should alleviate the potential risk of misinterpretation of thyroid function tests in pregnancy (from Panesar, Ref 87).