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for Values in Clinical Chemistry
| Component | Conventional Reference values/ Units | Conversion factor | SI Reference Values/ Units |
| Thyroid-stimulating hormone (TSH) | 0-5 μIU/mL | 1.0 | 0-5 mIU/L |
| Thyroxine T4 Male Female | 4.0-12.0 mcg/dL 5.0-12.0 mcg/dL | 12.87 12.87 | 51-154 nmol/L 64-154 nmol/L |
| Triiodothyronine T3 | 70-235 ng/mL | 0.01536 | 1.1-3.6 nmol/L |
| Transferrin (S) Male Female | 215-365 mg/dL 250-380 mg/dL | 0.01 0.01 | 2.15-3.65 g/L 2.50-3.80 g/L |
| Triglycerides (S) | <100 mg/dL | 0.01129 | <1.13 mmol/L |
| Urea nitrogen (S) | 6-25 mg/dL | 0.3570 | 2.1-8.9 mmol/L |
S = Serum, B = Blood, P = Plasma, U = Urine
Adapted from Fischbach,F A Manual of Laboratory and Diagnostic Tests, 8th ed. Philadelphia, PA, Lippincott, Williams & Wilkins
Laboratory Assessment of Nutritional Status: Bridging Theory & Practice uses a variety of standard abbreviations and units of measurement listed in Table 3. Many organizations are moving away from the use of lower case Greek letters such as μ for micro to avoid miscommunication. Please note that your institutional policy on standard abbreviations and units of measurement may vary.
Table 3. Abbreviations & Units of Measurement
| Abbreviation | Definition | Abbreviation | Definition |
| < | Less than | kg H2O | Kilogram of water |
| < | Less than or equal to | L | Liter |
| > | Greater than | m | Meter |
| > | Greater than or equal to | m2 | Square meter |
| AU | Arbitrary units | m3 | Cubic meter |
| C | Celsius | mcg | Microgram |
| cc | Cubic centimeter | μmol | Micromole |
| cg | Centigram | mEq | Milliequivalent |
| cm | Centimeter | mEq/L | Milliequivalent per liter |
| cm H2O | Centimeter of water | mg | Milligram |
| cu | Cubic | min | Minute |
| dL | Deciliter (100 mL) | mL | Milliliter |
| fl | Femtoliter | mm | Millimeter |
| fmol | Femtomole | mm3 | Cubic millimeter |
| g or gm | Gram | mM | Millimole |
| h | Hour | mm Hg | Millimeter of mercury |
| IU | International Unit | mm H2O | Millimeter of water |
| ImU | International milliunit | mol | Mole |
| ImcU | International microunit | mmol | Millimole |
| IU | International Unit | mOsm | Milliosmole |
| K | Kilo | mμ | Millimicron |
| kat | Katal | mU | Milliunit |
| kg | Kilogram | mμ | Millimicron |
Table 3. Abbreviations & Units of Measurement
| Abbreviation | Definition | Abbreviation | Definition |
| μ3 | Cubic micron | ng | Nanogram |
| μKat | Microkatal | nm | Nanometer |
| μg | Microgram | nmol |
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