International System of Units (SI) Conversion

Use the following information to convert conventional units of measure to SI units when you review laboratory test results.

The conversion factor (CF) is used as follows:

  • conventional unit × CF = SI unit
  • SI unit ÷ CF = conventional unit

Analyte Reported Unit Conversion Factor SI Unit
25HDN – 25-Hydroxyvitamin D2 and D3, Serum
25-Hydroxy D2 ng/mL 2.4271845 nmol/L
25-Hydroxy D3 ng/mL 2.5 nmol/L
25-Hydroxy D Total ng/mL 2.496 nmol/L
3MT – 3-Methoxytyramine, 24 Hour, Urine
3-Methoxytyramine, U mcg/24 h 5.98068240 nmol/day
ACE – Angiotensin Converting Enzyme, Serum
Angiotensin Converting Enzyme, S U/L 0.017 mcKat/L
ACTH – Adrenocorticotropic Hormone (ACTH), Plasma
Adrenocorticotropic Hormone, P pg/mL 0.22 pmol/L
AL – Aluminum, Serum
Aluminum, S ng/mL 0.0371 mcmol/L
ALB – Albumin, Serum
Albumin, S g/dL 10 g/L
ALDS – Aldosterone, Serum
Aldosterone, S ng/dL 0.0277431 nmol/L
ALDU – Aldosterone, 24 Hour, Urine
Aldosterone, U mcg/24 h 2.77430989 nmol/day
ANST – Androstenedione, Serum
Androstenedione, S ng/dL 0.0349144 nmol/L
CA – Calcium, Total, Serum
Calcium, Total, S mg/dL 0.25 mmol/L
CAI – Calcium, Ionized, Serum
Calcium, Ionized, S mg/dL 0.25 mmol/L
CATN – Calcitonin, Serum
Calcitonin, S pg/mL 1 ng/L
CATP – Catecholamine Fractionation, Free, Plasma
Norepinephrine pg/mL 5.9108642 pmol/L
Epinephrine pg/mL 5.4583067 pmol/L
Dopamine pg/mL 6.5282248 pmol/L
CATU – Catecholamine Fractionation, Free, 24 Hour, Urine
Norepinephrine mcg/24 h 5.9108642 nmol/day
Epinephrine mcg/24 h 5.4583067 nmol/day
Dopamine mcg/24 h 6.5282248 nmol/day
COCOU – Cortisol/Cortisone, Free, 24 Hour, Urine
Cortisol, U mcg/24 h 2.76 nmol/day
CORT – Cortisol, Serum
Cortisol, S mcg/dL 27.6 nmol/L
AM Result mcg/dL 27.6 nmol/L
PM Result mcg/dL 27.6 nmol/L
CORTU – Cortisol, Free, 24 Hour, Urine
Cortisol, U mcg/24 h 2.76 nmol/day
CTU – Creatinine, 24 Hour, Urine
Creatinine, U mg/24 h 0.00884 mmol/day
Creatinine Conc mg/dL 0.0884 mmol/L
DCORT – 11-Deoxycortisol, Serum
11-Deoxycortisol, S ng/dL 0.0289 nmol/L
DHEA_ – Dehydroepiandrosterone (DHEA), Serum
Dehydroepiandrosterone, S ng/mL 3.4670337 nmol/L
DHES1 – Dehydroepiandrosterone Sulfate, Serum
Dehydroepiandrosterone Sulfate, S mcg/dL 0.027 mcmol/L
DHVD – 1,25-Dihydroxyvitamin D, Serum
1,25-Dihydroxyvitamin D, S pg/mL 2.4038462 pmol/L
E1 – Estrone, Serum
Estrone, S pg/mL 3.6986078 pmol/L
EEST – Estradiol, Serum
Estradiol, Mass Spectrometry, S pg/mL 3.6712337 pmol/L
FRT3 – T3 (Triiodothyronine), Free, Serum
T3 (Triiodothyronine), Free, S pg/mL 1.54 pmol/L
FRT4 – T4 (Thyroxine), Free, Serum
T4 (Thyroxine), Free, S ng/dL 12.87 pmol/L
FRTUP – Free Thyroxine Index (FTI), Serum
Free Thyroxine Index mcg/dL 12.87 nmol/L
GAST – Gastrin, Serum
Gastrin, S pg/mL 1 ng/L
GLP – Glucagon, Plasma
Glucagon, P pg/mL 1 ng/L
GLSF – Glucose, Spinal Fluid
Glucose, CSF mg/dL 0.05551 mmol/L
HGH – Growth Hormone, Serum
Growth Hormone, S ng/mL 1 mcg/L
INS – Insulin, Serum
Insulin, S mcIU/mL 6.95 pmol/L
LIVPR – Liver Profile, Serum
Albumin, S g/dL 10 g/L
METAF – Metanephrines, Fractionated, 24 Hour, Urine
Metanephrine, U mcg/24 h 5.0701198 nmol/day
Normetanephrine, U mcg/24 h 5.4583067 nmol/day
Total Metanephrines, U mcg/24 h 5.2642133 nmol/day
PGSN – Progesterone, Serum
Progesterone, S ng/mL 3.18 nmol/L
PRL – Prolactin, Serum
Prolactin, S ng/mL 1 mcg/L
SERWB – Serotonin, Blood
Serotonin, B ng/mL 5.68 nmol/L
T3 – T3 (Triiodothyronine), Total, Serum
T3 (Triiodothyronine), Total, S ng/dL 0.0154 nmol/L
T4 – T4 (Thyroxine), Total Only, Serum
T4 (Thyroxine), Total Only, S mcg/dL 12.87 nmol/L
TBGI – Thyroxine-Binding Globulin (TBG), Serum
Thyroxine Binding Globulin, S mcg/mL 1 mg/L
TGRP – Testosterone, Total and Free, Serum
Testosterone, Free, S ng/dL 34.6703371 pmol/L
TRIG – Triglycerides, Serum
Triglycerides, S mg/dL 0.0113 mmol/L
TTST – Testosterone, Total by Mass Spectrometry, Serum
Testosterone, Total, S ng/dL 0.0346703 nmol/L
UE3 – Estriol, Unconjugated, Serum
Estriol, Unconjugated, S ng/mL 3.47 nmol/L
UOSMS – Osmolality, Serum
Osmolality, S mOsm/kg 1 mmol/kg