How is free T4 measured and monitored in pregnancy?

Updated: Mar 03, 2021
  • Author: Philip R Orlander, MD, FACP; Chief Editor: George T Griffing, MD  more...
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In pregnancy, the variation in the results of commercially available free T4 assays has led the American Thyroid Association to recommend using method-specific and trimester-specific reference ranges for serum free T4. If these specific ranges are not available, TSH, total T4, and FTI can be used to monitor the pregnant patient.

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