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. 1977 May;44(5):998-1001.
doi: 10.1210/jcem-44-5-998.

Seasonal variation in serum T3 and T4 levels in man

A G Smals, H A Ross, P W Kloppenborg

Seasonal variation in serum T3 and T4 levels in man

A G Smals et al. J Clin Endocrinol Metab. 1977 May.

Abstract

In a group of 13 healthy male adults in the Netherlands, a seasonal variation in circulating serum thyroxine (T4) and triiodothyronine (T3) levels was found, inversely correlating with the seasonally altering environmental temperature. Lowest serum T4 and T3 levels were found in the summer.

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