AGE

US REFERENCE VALUE

CONVERSION
FACTOR

SI REFERENCE
VALUE

THYROID THYROGLOBULIN, SERUM

Cord blood

14.7-101.1 ng/mL

×1

14.7-101.1 µg/L

Birth to 35 mo

10.6-92.0 ng/mL

×1

10.6-92.0 µg/L

3-11 yr

5.6-41.9 ng/mL

×1

5.6-41.9 µg/L

12-17 yr

2.7-21.9 ng/mL

×1

2.7-21.9 µg/L

THYROID STIMULATING HORMONE, SERUM

Premature Infants (28-36 wk)

1st wk of life

0.7-27.0 mIU/L

×1

0.7-27.0 mIU/L

Term Infants

Birth to 4 days

1.0-38.9 mIU/L

×1

1.0-28.9 mIU/L

2-20 wk

1.7-9.1 mIU/L

×1

1.7-9.1 mIU/L

5 mo-20 yr

0.7-6.4 mIU/L

×1

0.7-6.4 mIU/L

THYROXINE BINDING GLOBULIN, SERUM

Cord blood

1.4-94 mg/dL

×10

14-94 mg/L

1-4 wk

1.0-9.0 mg/dL

×10

10-90 mg/L

1-12 mo

2.0-7.6 mg/dL

×10

20-76 mg/L

1-5 yr

2.9-5.4 mg/dL

×10

29-54 mg/L

5-10 yr

2.5-5.0 mg/dL

×10

25-50 mg/L

10-15 yr

2.1-4.6 mg/dL

×10

21-46 mg/L

Adult

1.5-3.4 mg/dL

×10

15-34 mg/L

THYROXINE, TOTAL, SERUM

Full-Term Infants

1-3 days

8.2-19.9 µg/dL

×12.9

106-256 nmol/L

1 wk

6.0-15.9 µg/dL

×12.9

77-205 nmol/L

1-12 mo

6.1-14.9 µg/dL

×12.9

79-192 nmol/L

Prepubertal Children

1-3 yr

6.8-13.5 µg/dL

×12.9

88-174 nmol/L

3-10 yr

5.5-12.8 µg/dL

×12.9

71-165 nmol/L

Pubertal Children and Adults

>10 yr

4.2-13.0 µg/dL

×12.9

54-167 nmol/L

THYROXINE, FREE, SERUM

Full-term (3 days)

2.0-4.9 ng/dL

×12.9

26-631 pmol/L

Infants

0.9-2.6 ng/dL

×12.9

12-33 pmol/L

Prepubertal children

0.8-2.2 ng/dL

×12.9

10-28 pmol/L

Pubertal children and adults

0.8-2.3 ng/dL

×12.9

10-30 pmol/L

THYROXINE, TOTAL, WHOLE BLOOD

Newborn screen (filter paper)

6.2-22 µg/dL

×12.9

80-283 nmol/L

TRIIDOTHYRONINE, FREE, SERUM

Cord blood

20-240 pg/dL

×0.01536

0.3-0.7 pmol/L

1-3 days

200-610 pg/dL

×0.01536

3.1-9.4 pmol/L

6 wk

240-560 pg/dL

×0.01536

3.7-8.6 pmol/L

Adult (20-50 yr)

230-660 pg/dL

×0.01536

3.5-10.0 pmol/L

TRIIODOTHYRONINE RESIN UPTAKE TEST (T3RU), SERUM

Newborn

26-36%

×0.01

0.26-0.36 fractional uptake

Thereafter

26-35%

×0.01

0.26-0.35 fractional uptake

TRIIODOTHYRONINE, TOTAL, SERUM

Cord blood

30-70 ng/dL

×0.0154

0.46-1.08 nmol/L

Newborn

75-260 ng/dL

×0.0154

1.16-4.00 nmol/L

1-5 yr

100-260 ng/dL

×0.0154

1.54-4.00 nmol/L

5-10 yr

90-240 ng/dL

×0.0154

1.39-3.70 nmol/L

10-15 yr

80-210 ng/dL

×0.0154

1.23-3.23 nmol/L

>15 yr

115-190 ng/dL

×0.0154

1.77-2.93 nmol/L