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Previous Volume 331:1302-1303 November 10, 1994 Number 19 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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Since the introduction 10 years ago of assays for serum thyrotropin that are sensitive enough to distinguish between normal and low concentrations, the measurement of serum thyrotropin has become the single best test of thyroid function. The reason is that an increase in the serum thyroxine (T₄) or triiodothyronine (T₃) concentration sufficient to cause clinically apparent hyperthyroidism inhibits thyrotropin secretion substantially, just as a decrease in the serum thyroid hormone concentration sufficient to cause hypothyroidism increases it.

Serum thyrotropin concentrations are usually undetectable in patients with overt hyperthyroidism. They may be detectable but low in patients with thyrotropin . . . [Full Text of this Article]

References

This article has been cited by other articles:

• Auer, J., Berent, R., Weber, T., Eber, B. (2002). Thyroid hormone and arrhythmogenic activity. J Am Coll Cardiol 40: 574-575 [Full Text]  
• Allahabadia, A., Daykin, J., Sheppard, M. C., Gough, S. C. L., Franklyn, J. A. (2001). Radioiodine Treatment of Hyperthyroidism--Prognostic Factors for Outcome. J. Clin. Endocrinol. Metab. 86: 3611-3617 [Abstract] [Full Text]  
• Kreuzberg, U., Theissen, P., Schicha, H., Schroder, F., Mehlhorn, U., de Vivie, E. R., Boknik, P., Neumann, J., Grohe, C., Herzig, S. (2000). Single-channel activity and expression of atrial L-type Ca2+ channels in patients with latent hyperthyroidism. Am. J. Physiol. Heart Circ. Physiol. 278: H723-H730 [Abstract] [Full Text]  
• (1994). LOW SERUM TSH: A RISK FACTOR FOR ATRIAL FIBRILLATION?. JWatch General 1994: 2-2 [Full Text]