SI Unit Conversion Table

SI Unit Conversion Table

 

Analyte

Conventional Units

Conventional to SI (multiply by)

SI Units

SI to Conventional (multiply by)

NA = not applicable.

AU = arbitrary unit.

Acetaminophen (Datril®, Tylenol®), serum

μg/mL

6.62

μmol/L

0.151

Acid phosphatase

units/L

NA

units/L

NA

Adrenocorticotropic hormone (ACTH)

pg/mL

1

ng/L

1

Alanine aminotransferase (ALT)

units/L

NA

units/L

NA

Albumin, serum

g/dL

10

g/L

0.10

Aldolase, serum

units/L

NA

units/L

NA

Aldosterone

       

serum

ng/dL

0.0277

nmol/L

36.10

urine

μg/24 h

2.77

nmol/d

0.361

Alkaline phosphatase

units/L

NA

units/L

NA

α1-Antitrypsin

mg/dL

0.01

g/L

100

α1-Fetoprotein

       

amniotic fluid

μg/mL

1

mg/L

1

serum

ng/mL

1

μg/L

1

Aluminum, serum

μg/L

0.0371

μmol/L

26.95

Amikacin, serum

μg/mL

1.71

μmol/L

0.585

Aminolevulinic acid (delta), urine

mg/24 h

7.626

μmol/d

0.131

Ammonia, plasma

μg/dL

0.59

μmol/L

1.69

Amylase, serum

units/L

NA

units/L

NA

Androstenedione

ng/dL

0.0349

nmol/L

28.7

Angiotensin-converting enzyme (ACE)

units/L

1

units/L

1

Antidiuretic hormone (ADH) (vasopressin)

pg/mL

1

ng/L

1

Arsenic

       

blood

μg/L

0.0133

μmol/L

75.2

urine

μg/L

0.0133

μmol/d

75.2

Aspartate aminotransferase (AST)

units/L

NA

units/L

NA

Bilirubin, serum

       

direct

mg/dL

17.1

μmol/L

0.0585

total

mg/dL

17.1

μmol/L

0.0585

Bromide, plasma

μg/mL

0.0125

mmol/L

799

Cadmium

       

blood

μg/L

8.897

nmol/L

0.112

urine

μg/g creatinine

8.897

μmol/g creatinine

0.112

Caffeine, serum

μg/mL

5.15

μmol/L

0.194

Calcitonin

pg/mL

1

ng/L

1

Calcium

       

ionized

mg/dL

0.25

mmol/L

4

serum

mg/dL

0.25

mmol/L

4

urine

mg/24 h

0.025

mmol/d

40

Carbamazepine (Tegretol®), serum

μg/mL

4.23

μmol/L

0.236

Carbon dioxide

mEq/L

1

mmol/L

1

Carboxyhemoglobin

%

NA

%

NA

Carcinoembryonic antigen (CEA)

ng/mL

1

μg/L

1

Carotene, serum

μg/dL

0.0186

μmol/L

53.8

Catecholamines, fractionation, urine

μg/24 h

5.91

nmol/d

0.169

Ceruloplasmin

mg/dL

10

μmol/L

0.10

Chloramphenicol, serum

μg/mL

3.09

μmol/L

0.323

Chlordiazepoxide (Librium®), serum

μg/mL

3.3

μmol/L

0.303

Chloride

       

serum

mEq/L

1

mmol/L

1

urine

mmol/24 h

1

mmol/d

1

Cholesterol

mg/dL

0.0259

mmol/L

38.61

HDL

mg/dL

0.0259

mmol/L

38.61

LDL

mg/dL

0.0259

mmol/L

38.61

Cholinesterase, serum

units/L

1000

kU/L

0.001

Chromium, plasma

μg/L

19.2

nmol/L

0.052

Clonazepam (Klonopin™), serum

ng/mL

3.17

nmol/L

0.315

Codeine, serum

ng/mL

3.34

nmol/L

0.299

Complement C3 activator

mg/dL

10

mg/L

0.10

Compound S (11-deoxycortisol)

μg/dL

0.029

μmol/L

34.5

Copper

       

serum

μg/L

0.0157

μmol/L

63.7

urine

μg/24 h

0.0157

μmol/d

63.7

Coproporphyrins

       

blood

μg/dL

15

nmol/L

0.067

fluid

μg/g

1.5

nmol/g

0.67

urine

μg/24 h

1.5

nmol/d

0.67

Cortisol

       

blood

μg/dL

27.6

nmol/L

0.036

urine

μg/24 h

2.76

nmol/d

0.362

C-Peptide, serum

ng/mL

0.33

nmol/L

3.03

Creatine kinase (CK)

units/L

NA

units/L

NA

Creatinine

       

serum

mg/dL

88.4

μmol/L

0.0113

urine

mg/kg/24 h

8.84

μmol/kg/d

0.113

 

mg/24 h

0.0088

μmol/d

113.1

Cyanide, blood

μg/mL

38.4

μmol/L

0.026

Cyclic AMP, urine

μg/L

3.04

μmol/L

0.329

Cystine, urine

mg/24 h

8.32

μmol/24 h

0.120

DHEA

ng/dL

0.0347

nmol/L

28.8

DHEA sulfate

μg/dL

0.026

μmol/L

38

Diazepam (Valium®), serum

μg/mL

0.0000035

μmol/L

286

Digitoxin

ng/mL

1.31

nmol/L

0.763

Digoxin (Lanoxin®)

ng/mL

1.28

nmol/L

0.781

Disopyramide (Norpace®), serum

μg/mL

2.95

μmol/L

0.339

Doxepin (Sinequan®), serum

ng/mL

3.58

nmol/L

0.279

Erythropoietin

mIU/mL

1

IU/L

1

Estradiol (E2), serum

pg/mL

3.67

pmol/L

0.272

Estriol (E3), serum

ng/mL

3.47

nmol/L

0.288

Estrone (E1), serum

pg/mL

3.70

pmol/L

0.27

Ethanol, blood

g/dL (%)

217

mmol/L

0.00461

Ethosuximide (Zarontin®), serum

μg/mL

7.08

μmol/L

0.141

Ethylene glycol, serum

mg/L

16.1

μmol/L

0.0621

Fecal fat

g/24 h

1

g/d

1

Ferritin, serum

ng/mL

1

μg/L

1

Fluoride, plasma

μg/mL

52.6

μmol/L

0.019

Folate

       

red cell

ng/mL

2.265

nmol/L

0.442

serum

ng/mL

2.265

nmol/L

0.442

Follicle-stimulating hormone (FSH)

mIU/mL

1

IU/L

1

γ-Glutamyl transferase (GGT)

units/L

NA

units/L

NA

Gastrin, serum

pg/mL

1

ng/L

1

Gentamicin, serum

μg/mL

2.09

μmol/L

0.478

Glucose

       

blood

mg/dL

0.0555

mmol/L

18.02

CSF

mg/dL

0.0555

mmol/L

18.02

urine

mg/dL

0.0555

mmol/L

18.02

Glutamine, CSF

μmol/dL

10

μmol/L

0.1

Glycohemoglobin

% of total Hb

0.01

Fraction of total Hb

100

Gold, plasma

mg/L

5.08

μmol/L

0.20

Growth hormone (GH)

ng/mL

1

μg/L

1

Haloperidol (Haldol®), serum

ng/mL

2.66

nmol/L

0.376

Haptoglobin, serum

mg/dL

10

mg/L

0.10

Human chorionic gonadotropin (hCG), serum

mIU/mL

1

IU/L

1

17-Hydroxycorticosteroids (17-OHCS), urine

mg/24 h

2.76

μmol/d

0.362

5-Hydroxyindoleacetic acid (5-HIAA), urine

mg/24 h

5.2

μmol/d

0.19

17-Hydroxyprogesterone

ng/dL

0.0303

nmol/L

33.0

Imipramine (Tofranil®), serum

ng/mL

3.57

nmol/L

0.280

Insulin, blood

μIU/mL

1

mIU/L

1

Iron

μg/dL

0.179

μmol/L

5.587

Iron-binding capacity, total (TIBC)

μg/dL

0.179

μmol/L

5.587

Isopropanol, blood

g/dL (%)

16.6

mmol/L

0.06

17-Ketogenic steroids, urine

mg/24 h

3.467

μmol/d

0.288

17-Ketosteroids

mg/24 h

3.467

μmol/d

0.288

Lactate dehydrogenase (LD)

units/L

NA

units/L

NA

Lactic acid

       

blood

mg/dL

0.111

mmol/L

9.01

CSF

mg/dL

0.111

mmol/L

9.01

Lead

       

blood

μg/dL

0.0483

μmol/L

20.70

urine

μg/24 h

0.00483

μmol/d

207.04

Lidocaine (Xylocaine®), serum

μg/mL

4.27

μmol/L

0.234

Lipase, serum

units/L

NA

units/L

NA

Lipids, total

mg/dL

0.01

g/L

100

Lithium, serum

mEq/L

1

mmol/L

1

Lorazepam, serum

ng/mL

3.11

nmol/L

0.321

Luteinizing hormone (LH)

mIU/mL

1

IU/L

1

Lysergic acid diethylamide (LSD)

ng/mL

0.0031

μmol/L

323

Magnesium

       

serum

mg/dL

0.4114

mmol/L

2.43

urine

mg/24 h

0.0411

mmol/d

24.31

Manganese

       

plasma

μg/L

18.2

nmol/L

0.055

urine

μg/L

18.2

nmol/L

0.055

Meperidine (Demerol®), serum

ng/mL

4.04

nmol/L

0.248

Mercury

       

blood

μg/L

0.005

μmol/L

200

urine

μg/L

0.005

μmol/d

200

Metanephrines, urine

μg/24 h

5.07

nmol/d

0.197

Methadone, serum

ng/mL

0.00323

μmol/L

310

Methanol, blood

g/dL (%)

312

mmol/L

0.0032

Methsuximide (Celontin®), serum

μg/mL

5.29

μmol/L

0.189

Myoglobin, serum

ng/mL

1

μg/L

1

N-Acetylprocainamide (NAPA), serum

μg/mL

3.61

μmol/L

0.277

Nortriptyline (Aventyl®), serum

ng/mL

3.80

nmol/L

0.263

5± Nucleotidase

units/L

NA

units/L

NA

Osmolality

       

serum

mOsm/kg

NA

mmol/kg

NA

urine

mOsm/kg

NA

mmol/kg

NA

Oxalate, urine

mg/24 h

11.4

μmol/d

0.088

Parathyroid hormone, intact

pg/mL

1

ng/L

1

Pentobarbital (Nembutal®), serum

μg/mL

4.42

μmol/L

0.226

Phencyclidine (PCP), serum or urine

ng/mL

4.11

nmol/L

0.243

Phenobarbital, serum

μg/mL

4.31

μmol/L

0.232

Phenylalanine, blood

μmol/dL

10

μmol/L

0.1

Phenytoin (Dilantin®)

       

free

μg/mL

3.96

μmol/L

0.253

serum

μg/mL

3.96

μmol/L

0.253

total

μg/mL

3.96

μmol/L

0.253

Phospholipids, serum

mg/dL

0.01

g/L

100

Phosphorus

       

serum

mg/dL

0.323

mmol/L

3.10

urine

g/24 h

32.3

mmol/d

0.031

Porphobilinogen (PBG), urine

mg/24 h

4.42

μmol/d

0.226

Potassium

       

blood

mEq/L

1

mmol/L

1

urine

mEq/24 h

1

mmol/d

1

Pregnanediol, urine

mg/24 h

3.12

μmol/24 h

0.321

Pregnanetriol, urine

mg/24 h

2.97

μmol/24 h

0.337

Primidone (Mysoline®), serum

μg/mL

4.58

μmol/L

0.218

Procainamide (Pronestyl®), serum

μg/mL

4.23

μmol/L

0.236

Progesterone

ng/mL

3.18

nmol/L

0.314

Prolactin

ng/mL

1

μg/L

1

Propoxyphene (Darvon®), serum or urine

ng/mL

0.003

μmol/L

339

Propranolol (Inderal®), serum

ng/mL

3.86

nmol/L

0.259

Protein

       

CSF

mg/dL

10

mg/L

0.10

serum

g/dL

10

g/L

0.10

urine

mg/24 h

0.001

g/d

1000

Protoporphyrin, free erythrocyte (FEP)

μg/dL

0.0178

μmol/L

56.18

Protoporphyrin, zinc (ZPP)

μg/dL

0.016

μmol/L

62.5

Quinidine, serum

μg/mL

3.08

μmol/L

0.325

Salicylate, serum

μg/mL

0.00724

mmol/L

138.1

Secobarbital (Seconal™), serum

μg/mL

4.20

μmol/L

0.238

Serotonin

ng/mL

0.00568

μmol/L

176

Sodium

       

blood

mEq/L

1

mmol/L

1

urine

mEq/24 h

1

mmol/d

1

T3 uptake (T3U)

%

1

AU*

1

Testosterone

ng/dL

0.0347

nmol/L

28.8

Theophylline, serum

μg/mL

5.55

μmol/L

0.18

Thiocyanate, serum

mg/dL

172

μmol/L

0.0058

Thyroglobulin

ng/mL

1

μg/L

1

Thyroid-stimulating hormone (TSH)

μIU/mL

1

mIU/L

1

Thyroxine-binding globulin (TBG)

μg/mL

1

mg/L

1

Thyroxine (T4)

μg/dL

12.9

nmol/L

0.0775

Thyroxine, free (FT4)

ng/dL

12.9

pmol/L

0.0775

Tobramycin, serum

μg/mL

2.14

μmol/L

0.467

Transferrin

mg/dL

0.01

g/L

100

Triglycerides

mg/dL

0.0113

mmol/L

88.5

Triiodothyronine (T3)

ng/dL

0.0154

nmol/L

64.9

Urea nitrogen, blood (BUN)

mg/dL

0.357

mmol/L

2.80

Uric acid

       

serum

mg/dL

0.059

mmol/L

16.9

urine

mg/24 h

0.0059

mmol/d

169

Valproic acid (Depakene®), serum

μg/mL

6.93

μmol/L

0.144

Vancomycin, serum

μg/mL

0.690

μmol/L

1.45

Vanillylmandelic acid (VMA), urine

mg/24 h

5.05

μmol/d

0.198

Vitamin

       

A

μg/dL

0.0349

μmol/L

28.65

B6

ng/mL

4.046

nmol/L

0.247

B12

ng/mL

738

pmol/L

0.001355

C

mg/dL

56.78

μmol/L

0.018

D3 (calcitriol, 1,25-dihydroxy)

pg/mL

2.4

pmol/L

0.417

E

mg/L

2.322

μmol/L

0.43

Warfarin (Coumadin®), serum

μg/mL

3.24

μmol/L

0.308

Xylose, plasma

mg/dL

0.0667

mmol/L

15.0

Zinc

       

serum

μg/dL

0.153

μmol/L

6.54

urine

μg/24 h

0.0153

μmol/d

65.36

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