| TSH | TT4 | fT4 index | fT4 |
---|---|---|---|---|
Laboratory reference range: | 0.3–4.5 mIU/L | 60–140 nM | 70–140 nM | 12–22 pM |
Samples within the reference range: | ||||
 Euthyroid, % (n) | 100 (180) | 99.4 (179) | 97.8 (176) |  |
 Mildly hypothyroid, % (n)a | 12.9 (31) | 97.1 (233) |  | 78.3 (188) |
 Sensitivity, % | 87.1 | 2.9 | 21.7 | |
 Specificity, % | 100 | 99.4 | 98.9 | |
 PPV, positive predictive value, % | 100 | 87.5 | 96.3 | |
 NPV, negative predictive value, % | 85.3 | 43.4 | 48.8 |