Age, kidney function, obesity, rhythm, and clinical setting affect interpretation.
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What’s searchable?The test method and the reason for testing affect which cutoff your clinician uses.
Advanced lipoprotein testing. Ask your clinician to use the performing laboratory classification.
Method, units, and cutoffs vary. Dr. Purser to decide whether to retain.
Adult interval. Pregnancy and pituitary disease require different interpretation.
Binding abnormalities and severe illness may affect some free-hormone assays.
Useful in selected hyperthyroid states; not a sensitive stand-alone test for hypothyroidism.
Affected by thyroid-binding globulin, pregnancy, estrogen, and medications.
Affected by binding proteins and nonthyroidal illness.
No broadly accepted treatment target. Dr. Purser to define whether and how this is used.
The test method matters. Positive result supports thyroid autoimmunity but does not determine treatment alone.
The test method matters. Also affects thyroglobulin tumor-marker interpretation.
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