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[AFJebb]

Underactive Thyroid

How useful a basal temperature readings, first thing in the morning, for the diagnosis of sub clinical ( blood tests wnl ) hypothyroidism ?

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AFJebb,

Useless. Hypothyroidism is diagnosed by thyroid function blood tests. Hypothyroid patients may have low basal temperature but other conditions also cause low temperature.

Arrange a blood test early in the morning when TSH is highest and fast (water only) as TSH drops after eating and drinking. Post your results in a new question for interpretation and advice.