< T >

Lab (Specimen)

Conventional Units

SI Units

T3 (Triiodothyronine) Free (serum)
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0-6 years: 2.4 -4.2 pg/mL
7-17 years: 2.9-5.1 pg/mL
> 18 years old: 2.3- 4.2 pg/mL
3.5 – 6.5 pmol/L
T3 (Triiodothyronine) Reverse (RT3) (serum)
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Birth-6 days: 600 -2500 pg/mL
> 7 days old: 90 -350 pg/mL
Adults: 0.11 – 0.32 ng/ml
           0.04 – 0.29 nmol/L
T3 (Triiodothyronine) Total  (serum)

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Cord blood: 14 -86 ng/dL
1-7 days: 100 -470 ng/dL
8- 364 days: 105 -245 ng/dL
1 -9 years: 94 -269 ng/dL
10-19 years: 102 -200 ng/dL
> 20 years old: 80 -200 ng/dL
Adults: 0.8 – 2.0 ng/ml
           0.9 – 2.8 nmol/L
T4 (thyroxine) Free (serum)
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0.8 – 1.8 ng/dL 10 – 23 pmol/L
T4 (thyroxine) Total (serum)
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4.5 – 12.5 µg/dL 58 – 161 nmol/L
Testosterone – total (serum)

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Male: 300 to 1000 ng/dL
Female: < 62 ng/dL

ALT:
Male:
14-15 yr: 33-585 ng/dL
16-17 yr: 185-886 ng/dL
18-39 yr: 400-1080 ng/dL
40-59 yr: 350-890 ng/dL
> 60 yr: 350-720 ng/dL

Tanner Stage IV: 165-854 ng/dL
Tanner Stage V: 194-783 ng/dL

Male: 6.7 – 28.9 nmol/L
Female: < 2.1 nmol/L
Thrombin time (plasma)
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10 – 13.5  sec 10 – 13.5  sec
Thyroglobulin (serum)
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</= 60 ng/mL </= 60 µg/L
Thyroid-stimulating hormone (TSH)  (serum)

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0.5 – 4.70 µIU/mL

American Association of Clinical Endocrinologists guidelines changed their normal range for TSH to 0.3 – 3.04 mIU/L.

0.5 – 4.70 mIU/L
Thyroxine-binding globulin (TBG) (serum)
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Depending on the lab:
Electrophoresis:
10 – 24 mg/dL

Radioimmunoassay is used:
1.3 – 2.0 mg/dL

Depending on the lab:
Electrophoresis:
10 – 24 mg/dL

Radioimmunoassay is used:
1.3 – 2.0 mg/dL

Thyroid Function Tests
Alternative source:

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Thyroid Function Testing

Thyroid Function Test
Measurement
Normal Range
Total T4 (TT4) bound and free T4 4.5 -11.5 ug/dL
Free T4 (FT4) free T4 0.8 -2.8 ng/dL
Free T4 Index (FT4I) estimate of free T4
FT4I = TT4 x RT3U
1.0 -4.3 U
Total T3 (TT3) bound and free T3 75 -200 ng/dL
Resin T3 Uptake (RT3U) binding capacity of TBG 25 -35%
TRH TRH 5 -25 mIu/mL
TSH TSH 0.3 – 5.0 U/mL
Thyroglobulin Thyroglobulin 5-25 ng/mL
Radioactive Iodine Uptake (RAIU) Distribution of radiolabeled iodine in the thyroid 5 hr – 5 to 15%
24 hr – 15 to 35%

Notes:
Free T4
– much more useful than total T4 (e.g. interested in unbound or active form).  Total T4 not commonly measured. Greatly affected by TBG. 
Free T4 index
: indirect measure of free T4. Corrects for high/low values of TBG.
Total T3
: not as useful as free T3, however, may be useful in locating problems with TBG, or if looking for problems with peripheral conversion of T4 to T3. 
Resin T3 Uptake
: if low, then TBG binding capacity is high. Opposite if high.
TSH
: best measure to determine thyroid function. 
Thyroglobulin
: nonspecific test that is elevated when the thyroid gland is inflamed or enlarged. 

Transferrin (serum)
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188 – 341 mg/dL 1.88 – 3.41 g/L
Triglycerides (serum)

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NML: 30-149 mg/dL

Normal: < 150 mg/dL.
Borderline-high:
    150 to 199 mg/dL
High: 200 to 499 mg/dL
Very High: >499 mg/dL

<2.26 mmol/L (<200 mg/dL)

Disclaimer

The authors make no claims of the accuracy of the information contained herein; and these suggested doses are not a substitute for clinical judgment. Neither GlobalRPh Inc. nor any other party involved in the preparation of this program shall be liable for any special, consequential, or exemplary damages resulting in whole or part from any user’s use of or reliance upon this material.PLEASE READ THE DISCLAIMER CAREFULLY BEFORE ACCESSING OR USING THIS SITE. BY ACCESSING OR USING THIS SITE, YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONS SET FORTH IN THE DISCLAIMER. Read the disclaimer