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TSH (Thyroid Stimulating Hormone), PREGNANCY
TSH (Thyroid Stimulating Hormone), PREGNANCY
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CPT Code(s)



Immunoassay (IA)

Reference Range(s)

First Trimester0.26-2.66 mIU/L
Second Trimester0.55-2.73 mIU/L
Third Trimester0.43-2.91 mIU/L
Results are flagged based on the first trimester assay-specific reference interval. For later stages of pregnancy, interpret results based on the trimester-specific reference intervals provided.

Clinical Significance

TSH levels are lower during pregnancy, especially during the 1st trimester. Based on recent clinical studies which have shown that even mildly elevated TSH during pregnancy is associated with adverse pregnancy outcomes, the American Thyroid Association has released clinical guidelines which recommend the use of assay-specific and trimester-specific reference intervals.

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