Table 4.

Reference intervals for triiodothyronine (T3)

Triiodothyronine (T3)a
Age	Female, ng/dl (nmol/l)		Male, ng/dl (nmol/l)
0 to <12 months	n=60	36–320 (.5–4.9)	n=74	48–320 (.7–4.9)
1 to <5 years	n=80	54–304 (.8–4.6)	n=130	90–285 (1.4–4.4)
5 to <9 years	n=96	64–272 (1.0–4.2)	n=123	60–290 (.9–4.5)
9 to <13 years	n=159	62–248 (.9–3.8)	n=178	65–270 (1.0–4.2)
13 to <16 years	n=289	52–198 (.8–3.0)	n=178	60–228 (.9–3.5)
16 to <19 years	n=206	28–202 (.4–3.1)	n=114	38–208 (.6–3.2)

Females and males ages newborn to 19 years old.

^aTo derive T3 ng/dl×0.0154=nmol/l.