TABLE 3.

Ternary Classification of Thyroid Function Based on Various Published Reference Ranges

Reference rangeEuthyroidHyperthyroidHypothyroidReference
0.45%–4.5%67.5%26.8%7.7%6
0.4%–1.7%35.0%61.0%4.0%3
0.4%–4.0%65.0%31.0%4.0%4
0.3%–3.4%57.7%38.2%4.1%2
0.2%–2.0%43.1%52.8%4.1%5
Biochemical status53.1%27.1%19.8%*11
Salivary classification44.8%50.0%5.2%
Physician visual rating51.0%43.8%5.2%
Physician rating with uptake value64.6%29.2%6.3%
  • *15.6% were hypothyroid without suppression of uptake (2.1% autonomous, 2.1% secondary hypothyroidism, 11.5% primary hypothyroidism, and 4.2% subclinical hypothyroidism).