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SI Conversion Calculator

Enter the desired value below in the Enter Quantity field and click the button to perform the metric conversion. If you wish to reverse a conversion begin by entering a value in the Conversion Result field and click to obtain the non SI value.

Table 1. Conversions to Metric Measures

Symbol	Known Quantity	Enter Quantity	Multiply by	To Find	Conversion Result	Metric Symbol	Convert
Length
in	inches		2.54	centimeters		cm
ft	feet		30	centimeters		cm
ft	feet		0.3	meters		m
yd	yards		0.9	meters		m
--	miles		1.6	kilometers		km
Area
sq in	square inches		6.5	square centimeters		cm²
sq ft	square feet		0.09	square meters		m²
sq yd	square yard		0.8	square meters		m²
--	square miles		2.6	square kilometers		km²
Mass
oz	ounces		28	grams		g
lb	pounds		0.45	kilograms		kg
Volume
tsp	teaspoons		5	milliliters		mL
tbsp	tablespoons		15	milliliters		mL
fl oz	fluid ounces		30	milliliters		mL
c	cups		0.24	liters		L
pt	US pints		0.47	liters		L
qt	US quarts		0.95	liters		L
gal	US gallons		3.8	liters		L
cu ft	cubic feet		0.03	cubic meters		m³
cu yd	cubic yard		0.76	cubic meters		m³

Table 2. Selected Laboratory Tests and Conversion Factors

Analyte	Specimen	Conventional Unit	Enter Quantity	Conversion Factor (Multiply by)	Conversion Result	SI Unit	Convert
Acetaminophen	Serum, plasma	µg/mL		6.614		µmol/L
Acetoacetate	Serum, plasma	mg/dL		97.95		µmol/L
Acetone	Serum, plasma	mg/dL		0.172		mmol/L
Acid phosphatase	Serum	U/L		16.667		nkat/L
Activated partial thromboplastin time (APTT)	Whole blood	s		1		s
Adenosine deaminase	Serum	U/L		16.667		nkat/L
Adrenocorticotropic hormone (ACTH)	Plasma	pg/mL		0.22		pmol/L
Alanine	Plasma	mg/dL		112.2		µmol/L
Alanine aminotransferase (ALT)	Serum	U/L		0.0167		µkat/L
Albumin	Serum	g/dL		10		g/L
Alcohol dehydrogenase	Serum	U/L		16.667		nkat/L
Aldolase	Serum	U/L		0.0167		µkat/L
Aldosterone	Serum, plasma	ng/dL		27.74		pmol/L
Alkaline phosphatase	Serum	U/L		0.0167		µkat/L
Alprazolam	Serum, plasma	ng/mL		3.24		nmol/L
Amikacin	Serum, plasma	µg/mL		1.708		µmol/L
α-Aminobutyric acid	Plasma	mg/dL		96.97		µmol/L
δ-Aminolevulinic acid	Serum	µg/dL		0.0763		µmol/L
Amiodarone	Serum, plasma	µg/mL		1.55		µmol/L
Amitriptyline	Plasma	ng/mL		3.605		nmol/L
Ammonia (as nitrogen)	Serum, plasma	µg/dL		0.714		µmol/L
Amobarbital	Serum	µg/mL		4.42		µmol/L
Amphetamine	Serum, plasma	ng/mL		7.4		nmol/L
Amylase	Serum	U/L		0.0167		µkat/L
Androstenedione	Serum	ng/dL		0.0349		nmol/L
Angiotensin I	Plasma	pg/mL		0.772		pmol/L
Angiotensin II	Plasma	pg/mL		0.957		pmol/L
Angiotensin-converting enzyme	Serum	U/L		16.667		nkat/L
Anion gap Na⁺–(Cl^- + HCO₃^-)	Serum, plasma	mEq/L		1		mmol/L
Antidiuretic hormone (ADH)	Plasma	pg/mL		0.923		pmol/L
Antithrombin III	Plasma	mg/dL		10		mg/L
α₁-Antitrypsin	Serum	mg/dL		0.184		µmol/L
Apolipoprotein A-I	Serum	mg/dL		0.01		g/L
Apolipoprotein B	Serum, plasma	mg/dL		0.01		g/L
Arginine	Serum	mg/dL		57.4		µmol/L
Arsenic	Whole blood	µg/L		0.0133		µmol/L
Ascorbic acid (see Vitamin C)
Asparagine	Plasma	mg/dL		75.689		µmol/L
Aspartate aminotransferase (AST)	Serum	U/L		0.0167		µkat/L
Aspartic acid	Plasma	mg/dL		75.13		µmol/L
Atrial natriuretic hormone	Plasma	pg/mL		1		ng/L
Bands (see White blood cell count)
Base excess	Whole blood	mEq/L		1		mmol/L
Basophils (see White blood cell count)
Bicarbonate	Serum	mEq/L		1		mmol/L
Bile acids (total)	Serum	µg/mL		2.448		µmol/L
Bilirubin, direct (conjugated)	Serum	mg/dL		17.104		µmol/L
Bilirubin, total	Serum	mg/dL		17.104		µmol/L
Biotin	Serum	pg/mL		0.00409		nmol/L
Bismuth	Whole blood	µg/L		4.785		nmol/L
Blood gases
Carbon dioxide, Pco₂	Arterial blood	mm Hg		0.133		kPa
pH	Arterial blood			1
Oxygen, Po₂	Arterial blood	mm Hg		0.133		kPa
Brain-type natriuretic peptide (BNP)	Plasma	pg/mL		1		ng/L
Bromide (toxic)	Serum	µg/mL		0.0125		mmol/L
C1 esterase inhibitor	Serum	mg/dL		10		mg/L
C3 complement	Serum	mg/dL		0.01		g/L
C4 complement	Serum	mg/dL		0.01		g/L
Cadmium	Whole blood	µg/L		8.896		nmol/L
Caffeine	Serum, plasma	µg/mL		5.15		µmol/L
Calcitonin	Plasma	pg/mL		0.292		pmol/L
Calcium, ionized	Serum	mg/dL		0.25		mmol/L
Calcium, total	Serum	mg/dL		0.25		mmol/L
Cancer antigen (CA) 125	Serum	U/mL		1		kU/L
Carbamazepine	Serum, plasma	µg/mL		4.233		µmol/L
Carbon dioxide (total)	Serum, plasma	mEq/L		1		mmol/L
Carboxyhemoglobin, toxic	Whole blood	%		0.01		Proportion of 1.0
Carcinoembryonic antigen (CEA)	Serum	ng/mL		1		µg/L
β-Carotene	Serum	µg/dL		0.01863		µmol/L
Carotenoids	Serum	µg/dL		0.01863		µmol/L
Ceruloplasmin	Serum	mg/dL		10		mg/L
Chloramphenicol	Serum	µg/mL		3.095		µmol/L
Chlordiazepoxide	Serum, plasma	µg/mL		3.336		µmol/L
Chloride	Serum, plasma	mEq/L		1		mmol/L
Chlorpromazine	Plasma	ng/mL		3.136		nmol/L
Chlorpropamide	Plasma	mg/L		3.61		µmol/L
Cholecalciferol (see Vitamin D)
Cholesterol
Total	Serum, plasma	mg/dL		0.0259		mmol/L
Cholesterol, high-density (HDL)	Serum, plasma	mg/dL		0.0259		mmol/L
Cholesterol, low-density (LDL)	Serum, plasma	mg/dL		0.0259		mmol/L
Cholinesterase	Serum	U/L		1.0		kU/L
Chorionic gonadotropin (ß-hCG) (nonpregnant)	Serum	mIU/mL		1		IU/L
Chromium	Whole blood	µg/L		19.232		nmol/L
Citrate	Serum	mg/dL		52.05		µmol/L
Citrulline	Plasma	mg/dL		57.081		µmol/L
Clonazepam	Serum	ng/mL		3.167		nmol/L
Clonidine	Serum, plasma	ng/mL		4.35		nmol/L
Clozapine	Serum	ng/mL		0.003		µmol/L
Coagulation factor I	Plasma	g/dL		29.41		µmol/L
(Fibrinogen)	Plasma	mg/dL		0.01		g/L
Coagulation factor II (prothrombin)	Plasma	%		0.01		Proportion of 1.0
Coagulation factor V	Plasma	%		0.01		Proportion of 1.0
Coagulation factor VII	Plasma	%		0.01		Proportion of 1.0
Coagulation factor VIII	Plasma	%		0.01		Proportion of 1.0
Coagulation factor IX	Plasma	%		0.01		Proportion of 1.0
Coagulation factor X	Plasma	%		0.01		Proportion of 1.0
Coagulation factor XI	Plasma	%		0.01		Proportion of 1.0
Coagulation factor XII	Plasma	%		0.01		Proportion of 1.0
Cobalt	Serum	µg/L		16.968		nmol/L
Cocaine (toxic)	Serum	ng/mL		3.297		nmol/L
Codeine	Serum	ng/mL		3.34		nmol/L
Coenzyme Q10 (ubiquinone)	Plasma	µg/mL		1		mg/L
Copper	Serum	µg/dL		0.157		µmol/L
Coproporphyrin	Urine	µg/24 h		1.527		µmol/d
Corticotropin	Plasma	pg/mL		0.22		pmol/L
Cortisol	Serum, plasma	µg/dL		27.588		nmol/L
Cotinine	Plasma	µg/L		5.675		nmol/L
C-peptide	Serum	ng/mL		0.331		nmol/L
C-reactive protein	Serum	mg/dL		10		mg/L
Creatine	Serum	mg/dL		76.25		µmol/L
Creatine kinase (CK)	Serum	U/L		0.0167		µkat/L
Creatine kinase–MB fraction	Serum	ng/mL		1		µg/L
Creatinine	Serum, plasma	mg/dL		88.4		µmol/L
Creatinine clearance	Serum, plasma	mL/min/1.73 m²		0.0167		mL/s/m²
Cyanide (toxic)	Whole blood	µg/mL		38.4		µmol/L
Cyclic adenosine monophosphate (cAMP)	Plasma	ng/mL		3.04		µmol/L
Cyclosporine	Serum	ng/mL		0.832		nmol/L
Cystine	Plasma	mg/dL		41.615		µmol/L
D-dimer	Plasma	µg/mL		5.476		nmol/L
Dehydroepiandrosterone (DHEA)	Serum	ng/mL		3.47		nmol/L
Dehydroepiandrosterone sulfate (DHEA-S)	Serum	µg/dL		0.027		µmol/L
Deoxycorticosterone	Serum	ng/dL		0.0303		nmol/L
Desipramine	Serum, plasma	ng/mL		3.754		nmol/L
Diazepam	Serum, plasma	ng/mL		0.0035		µmol/L
Digoxin	Plasma	ng/mL		1.281		nmol/L
Diltiazem	Serum	mg/L		2.412		µmol/L
Disopyramide	Serum, plasma	µg/mL		2.946		µmol/L
Dopamine	Plasma	pg/mL		6.528		pmol/L
Doxepin	Serum, plasma	ng/mL		3.579		nmol/L
Electrophoresis (protein)
Proportion of total protein
Albumin	Serum	%		0.01		Proportion of 1.0
α₁-Globulin	Serum	%		0.01		Proportion of 1.0
α₂-Globulin	Serum	%		0.01		Proportion of 1.0
ß-Globulin	Serum	%		0.01		Proportion of 1.0
γ-Globulin	Serum	%		0.01		Proportion of 1.0
Concentration
Albumin	Serum	g/dL		10		g/L
α₁-Globulin	Serum	g/dL		10		g/L
α₂-Globulin	Serum	g/dL		10		g/L
ß-Globulin	Serum	g/dL		10		g/L
γ-Globulin	Serum	g/dL		10		g/L
Eosinophils (see White blood cell count)
Ephedrine (toxic)	Serum	µg/mL		6.052		µmol/L
Epinephrine	Plasma	pg/mL		5.459		pmol/L
Erythrocyte count (see Red blood cell count)
Erythrocyte sedimentation rate	Whole blood	mm/h		1		mm/h
Erythropoietin	Serum	mIU/mL		1		IU/L
Estradiol (E₂ )	Serum	pg/mL		3.671		pmol/L
Estriol (E₃ )	Serum	ng/mL		3.467		nmol/L
Estrogens (total)	Serum	pg/mL		1		ng/L
Estrone (E₁ )	Serum, plasma	pg/mL		3.698		pmol/L
Ethanol (ethyl alcohol)	Serum, whole blood	mg/dL		0.2171		mmol/L
Ethchlorvynol (toxic)	Serum, plasma	µg/mL		6.915		µmol/L
Ethosuximide	Serum	mg/L		7.084		µmol/L
Ethylene glycol (toxic)	Serum, plasma	mg/dL		0.1611		mmol/L
Fatty acids (nonesterified)	Serum, plasma	mg/dL		0.0355		mmol/L
Fecal fat (as stearic acid)	Stool	g/d		1		g/24 h
Fentanyl	Serum	µg/mL		2.972		µmol/L
Ferritin	Serum	ng/mL		1		µg/L
α₁-Fetoprotein	Serum	ng/mL		1		µg/L
Fibrin degradation products	Plasma	µg/mL		1		mg/L
Fibrinogen	Plasma	mg/dL		0.01		g/L
Flecainide	Serum, plasma	µg/mL		2.413		µmol/L
Fluoride	Whole blood	mg/dL		0.5263		mmol/L
Fluoxetine	Serum	ng/mL		0.00323		µmol/L
Flurazepam (toxic)	Serum, plasma	µg/mL		2.578		µmol/L
Folate (folic acid)	Serum	ng/mL		2.266		nmol/L
Follicle-stimulating hormone (FSH)	Serum, plasma	mIU/mL		1		IU/L
Fructosamine	Serum	mg/L		5.581		mmol/L
Fructose	Serum	mg/dL		55.506		µmol/L
Galactose	Serum, plasma	mg/dL		0.0555		mmol/L
Gastrin	Serum	pg/mL		0.481		pmol/L
Gentamicin	Serum	µg/mL		2.09		µmol/L
Glucagon	Plasma	pg/mL		1		ng/L
Glucose	Serum	mg/dL		0.0555		mmol/L
Glucose-6-phosphate dehydrogenase	Whole blood	U/g hemoglobin		0.0167		nkat/g hemoglobin
Glutamic acid	Plasma	mg/dL		67.967		µmol/L
Glutamine	Plasma	mg/dL		68.423		µmol/L
γ-Glutamyltransferase (GGT)	Serum	U/L		0.0167		µkat/L
Glutethimide	Serum	µg/mL		4.603		µmol/L
Glycerol (free)	Serum	mg/dL		0.1086		mmol/L
Glycine	Plasma	mg/dL		133.2		µmol/L
Gold	Serum	µg/dL		50.77		nmol/L
Growth hormone (GH)	Serum	ng/mL		1		µg/L
Haloperidol	Serum, plasma	ng/mL		2.66		nmol/L
Haptoglobin	Serum	mg/dL		10		mg/L
Hematocrit	Whole blood	%		0.01		Proportion of 1.0
Hemoglobin	Whole blood	g/dL		10		g/L
Mean corpuscular hemoglobin (MCH)	Whole blood	pg/cell		1		pg/cell
Mean corpuscular hemoglobin concentration (MCHC)	Whole blood	g/dL		10		g/L
Mean corpuscular volume (MCV)	Whole blood	µm³		1		fL
Hemoglobin A_1c (glycated hemoglobin)	Whole blood	% of total hemoglobin		0.01		Proportion of total hemoglobin
Dual report as mmol/mol
Hemoglobin A₂	Whole blood	%		0.01		Proportion of 1.0
Histamine	Plasma	µg/L		8.997		nmol/L
Histidine	Plasma	mg/dL		64.45		µmol/L
Homocysteine	Plasma	mg/L		7.397		µmol/L
Homovanillic acid	Urine	mg/24 h		5.489		µmol/d
Hydrocodone	Serum	µg/mL		3.34		µmol/L
Hydromorphone	Serum	µg/mL		3504		nmol/L
β-Hydroxybutyric acid	Plasma	mg/dL		96.06		µmol/L
5-Hydroxyindoleacetic acid (5-HIAA)	Urine	mg/24 h		5.23		µmol/d
Hydroxyproline	Plasma	mg/dL		76.266		µmol/L
Ibuprofen	Serum	µg/mL		4.848		µmol/L
Imipramine	Plasma	ng/mL		3.566		nmol/L
Immunoglobulin A (IgA)	Serum	mg/dL		0.01		g/L
Immunoglobulin D (IgD)	Serum	mg/dL		10		mg/L
Immunoglobulin E (IgE)	Serum	mg/dL		10		mg/L
Immunoglobulin G (IgG)	Serum	mg/dL		0.01		g/L
Immunoglobulin M (IgM)	Serum	mg/dL		0.01		g/L
Insulin	Serum	µIU/mL		6.945		pmol/L
Insulinlike growth factor	Serum	ng/mL		0.131		nmol/L
Iodine	Serum	µg/L		7.88		nmol/L
Iron	Serum	µg/dL		0.179		µmol/L
Iron-binding capacity	Serum	µg/dL		0.179		µmol/L
Isoleucine	Plasma	mg/dL		76.236		µmol/L
Isoniazid	Plasma	µg/mL		7.291		µmol/L
Isopropanol (toxic)	Serum, plasma	mg/L		0.0166		mmol/L
Kanamycin	Serum, plasma	µg/mL		2.064		µmol/L
Ketamine	Serum	µg/mL		4.206		µmol/L
17-Ketosteroids	Urine	mg/24 h		3.33		µmol/d
Lactate	Plasma	mg/dL		0.111		mmol/L
Lactate dehydrogenase (LDH)	Serum	U/L		0.0167		µkat/L
LDH isoenzymes
LD₁	Serum	%		0.01		Proportion of 1.0
LD₂	Serum	%		0.01		Proportion of 1.0
LD₃	Serum	%		0.01		Proportion of 1.0
LD₄	Serum	%		0.01		Proportion of 1.0
LD₅	Serum	%		0.01		Proportion of 1.0
Lead	Serum	µg/dL		0.0483		µmol/L
Leucine	Plasma	mg/dL		76.237		µmol/L
Leukocytes (see White blood cell count)
Lidocaine	Serum, plasma	µg/mL		4.267		µmol/L
Lipase	Serum	U/L		0.0167		µkat/L
Lipoprotein(a) [Lp(a)]	Serum	mg/dL		0.1		mg/L
Lithium	Serum	mEq/L		1		mmol/L
Lorazepam	Serum	ng/mL		3.114		nmol/L
Luteinizing hormone (LH)	Serum, plasma	mIU/mL		1		IU/L
Lycopene	Serum	mg/L		1.863		µmol/L
Lymphocytes (see White blood cell count)
Lysergic acid diethylamide	Serum	µg/mL		3092		nmol/L
Lysine	Plasma	mg/dL		68.404		µmol/L
Lysozyme	Serum, plasma	mg/dL		10		mg/L
Magnesium	Serum	mg/dL		0.4114		mmol/L
Manganese	Whole blood	µg/L		18.202		nmol/L
Maprotiline	Plasma	ng/mL		1		µg/L
Melatonin	Serum	ng/L		4.305		pmol/L
Meperidine	Serum, plasma	ng/mL		4.043		nmol/L
Mercury	Serum	µg/L		4.985		nmol/L
Metanephrine (total)	Urine	mg/24 h		5.07		µmol/d
Metformin	Serum	µg/mL		7.742		µmol/L
Methadone	Serum, plasma	ng/mL		0.00323		µmol/L
Methamphetamine	Serum	µg/mL		6.7		µmol/L
Methanol	Plasma	mg/mL		0.312		mmol/L
Methaqualone	Serum, plasma	µg/mL		3.995		µmol/L
Methemoglobin	Whole blood	g/dL		155		µmol/L
Methemoglobin	Whole blood	% of total hemoglobin		0.01		Proportion of total hemoglobin
Methicillin	Serum	mg/L		2.636		µmol/L
Methionine	Plasma	mg/dL		67.02		µmol/L
Methotrexate	Serum, plasma	mg/L		2200		nmol/L
Methyldopa	Plasma	µg/mL		4.735		µmol/L
Metoprolol	Serum, plasma	ng/mL		3.74		nmol/L
ß ₂ -Microglobulin	Serum	mg/L		1		mg/L
Morphine	Serum, plasma	ng/mL		3.504		nmol/L
Myoglobin	Serum	µg/L		0.05814		nmol/L
Naproxen	Serum	µg/mL		4.343		µmol/L
Niacin (nicotinic acid)	Urine	mg/24 h		8.123		µmol/d
Nickel	Whole blood	µg/L		17.033		nmol/L
Nicotine	Plasma	mg/L		6.164		µmol/L
Nitrogen (nonprotein)	Serum	mg/dL		0.714		mmol/L
Nitroprusside (as thiocyanate)		µg/mL		17.2		µmol/L
Norepinephrine	Plasma	pg/mL		5.911		pmol/L
Nortriptyline	Serum, plasma	ng/mL		3.797		nmol/L
Ornithine	Plasma	mg/dL		75.666		µmol/L
Osmolality	Serum	mOsm/kg		1		mmol/kg
Osteocalcin	Serum	ng/mL		1		µg/L
Oxalate	Serum	mg/mL		11.107		µmol/L
Oxazepam	Serum, plasma	µg/mL		3.487		µmol/L
Oxycodone	Serum	ng/mL		3.171		nmol/L
Oxygen, partial pressure (Po ₂ )	Arterial blood	mm Hg		0.133		kPa
Paraquat	Whole blood	µg/mL		5.369		µmol/L
Parathyroid hormone	Serum	pg/mL		1		ng/L
Pentobarbital	Serum, plasma	µg/mL		4.419		µmol/L
Pepsinogen	Serum	ng/mL		1		µg/L
pH (see Blood gases)
Phencyclidine (toxic)	Serum, plasma	ng/mL		4.109		nmol/L
Phenobarbital	Serum, plasma	µg/mL		4.31		µmol/L
Phenylalanine	Plasma	mg/dL		60.544		µmol/L
Phenylpropanolamine	Serum	µg/mL		6613		nmol/L
Phenytoin	Serum, plasma	mg/L		3.968		µmol/L
Phosphorus (inorganic)	Serum	mg/dL		0.323		mmol/L
Placental lactogen	Serum	µg/mL		46.296		nmol/L
Plasminogen (antigenic)	Plasma	mg/dL		0.113		µmol/L
Plasminogen activator inhibitor	Plasma	ng/mL		22.19		pmol/L
Platelet count (thrombocytes)	Whole blood	×10³/µL		1		×10⁹/L
Potassium	Serum	mEq/L		1		mmol/L
Prealbumin	Serum	mg/dL		10		mg/L
Pregnanediol	Urine	mg/24 h		3.12		µmol/d
Pregnanetriol	Urine	mg/24 h		2.972		µmol/d
Primidone	Serum, plasma	µg/mL		4.582		µmol/L
Procainamide	Serum, plasma	µg/mL		4.25		µmol/L
Progesterone	Serum	ng/mL		3.18		nmol/L
Prolactin	Serum	ng/L		1		µg/L
Proline	Plasma	mg/dL		86.858		µmol/L
Propoxyphene	Plasma	µg/mL		2.946		µmol/L
Propranolol	Serum	ng/mL		3.856		nmol/L
Prostate-specific antigen	Serum	ng/mL		1		µg/L
Protein (total)	Serum	g/dL		10		g/L
Prothrombin time (PT)	Plasma	s		1		s
Protoporphyrin	Red blood cells	µg/dL		0.0178		µmol/L
Protriptyline	Serum, plasma	µg/dL		3.787		nmol/L
Pyridoxine (see Vitamin B₆)
Pyruvate	Plasma	mg/dL		113.56		µmol/L
Quinidine	Serum	µg/mL		3.082		µmol/L
Red blood cell count	Whole blood	×10⁶/µL		1		×10¹²/L
Renin	Plasma	pg/mL		0.0237		pmol/L
Reticulocyte count	Whole blood	×10³/µL		1		×10⁹/L
Reticulocyte count	Whole blood	% of red blood cells		0.01		Proportion of red blood cells
Retinol (see Vitamin A)
Riboflavin (see Vitamin B₂)
Rifampin	Serum	mg/L		1.215		µmol/L
Salicylates	Serum, plasma	µg/mL		7.24		µmol/L
Selenium	Serum, plasma	µg/L		0.0127		µmol/L
Serine	Plasma	mg/dL		95.156		µmol/L
Serotonin (5-hydroxytryptamine)	Whole blood	ng/mL		0.00568		µmol/L
Sex hormone-binding globulin	Serum	µg/mL		8.896		nmol/L
Sodium	Serum	mEq/L		1		mmol/L
Somatomedin C (insulinlike growth factor)	Serum	ng/mL		0.131		nmol/L
Somatostatin	Plasma	pg/mL		0.611		pmol/L
Streptomycin	Serum	mg/L		1.719		µmol/L
Strychnine	Whole blood	mg/L		2.99		µmol/L
Substance P	Plasma	pg/mL		0.742		pmol/L
Sulfate	Serum	mg/L		10.41		µmol/L
Sulfmethemoglobin	Whole blood	% of total hemoglobin		0.01		Proportion of total hemoglobin
Taurine	Plasma	mg/dL		79.91		µmol/L
Testosterone	Serum	ng/dL		0.0347		nmol/L
Tetrahydrocannabinol	Serum	µg/mL		3.18		µmol/L
Theophylline	Serum, plasma	µg/mL		5.55		µmol/L
Thiamine (see Vitamin B₁ )
Thiopental	Serum, plasma	µg/mL		4.144		µmol/L
Thioridazine	Serum, plasma	µg/mL		2.699		µmol/L
Threonine	Plasma	mg/dL		84		µmol/L
Thrombin time	Plasma	s		1		s
Thrombocytes (see Platelet count)
Thyroglobulin	Serum	ng/mL		1		µg/L
Thyrotropin	Serum	mIU/L		1		mIU/L
Thyroxine, free (FT ₄ )	Serum	ng/dL		12.871		pmol/L
Thyroxine, total (T ₄ )	Serum	µg/dL		12.871		nmol/L
Thyroxine-binding globulin	Serum	µg/mL		17.094		nmol/L
Tissue plasminogen activator	Plasma	IU/mL		1000		IU/L
Tobramycin	Serum, plasma	µg/mL		2.139		µmol/L
Tocainide	Serum	µg/mL		5.201		µmol/L
α-Tocopherol (see Vitamin E)
Tolbutamide	Serum	µg/mL		3.7		µmol/L
Transferrin	Serum	mg/dL		0.123		µmol/L
Triglycerides	Serum	mg/dL		0.0113		mmol/L
Triiodothyronine, free (FT₃)	Serum	pg/dL		0.0154		pmol/L
Triiodothyronine, total (T₃)	Serum	ng/dL		0.0154		nmol/L
Troponin I	Serum	ng/mL		1		µg/L
Troponin T	Serum	ng/mL		1		µg/L
Tryptophan	Plasma	mg/dL		48.967		µmol/L
Tyrosine	Plasma	mg/dL		55.19		µmol/L
Urea nitrogen	Serum	mg/dL		0.357		mmol/L
Uric acid	Serum	mg/dL		0.0595		mmol/L
Urobilinogen	Urine	mg/24 h		1.7		µmol/d
Valine	Plasma	mg/dL		85.361		µmol/L
Valproic acid	Serum, plasma	µg/mL		6.934		µmol/L
Vancomycin	Serum, plasma	µg/mL		0.69		µmol/L
Vanillylmandelic acid (VMA)	Urine	mg/24 h		5.046		µmol/d
Vasoactive intestinal polypeptide	Plasma	pg/mL		0.296		pmol/L
Vasopressin	Plasma	pg/mL		0.923		pmol/L
Verapamil	Serum, Plasma	ng/mL		2.2		nmol/L
Vitamin A (retinol)	Serum	µg/dL		0.0349		µmol/L
Vitamin B₁ (thiamine)	Serum	µg/dL		29.6		nmol/L
Vitamin B₂ (riboflavin)	Serum	µg/dL		26.6		nmol/L
Vitamin B₃	Whole blood	µg/mL		4.56		µmol/L
Vitamin B₆ (pyridoxine)	Plasma	ng/mL		4.046		nmol/L
Vitamin B₁₂	Serum	pg/mL		0.7378		pmol/L
Vitamin C (ascorbic acid)	Serum	mg/dL		56.78		µmol/L
Vitamin D (1,25 dihydroxyvitamin D)	Serum	pg/mL		2.4		pmol/L
Vitamin D (25-hydroxyvitamin D)	Plasma	ng/mL		2.496		nmol/L
Vitamin E (α-tocopherol)	Serum	µg/mL		2.322		µmol/L
Vitamin K	Serum	ng/mL		2.22		nmol/L
Warfarin	Serum, plasma	µg/mL		3.247		µmol/L
White blood cell count	Whole blood	/µL		0.001		×10⁹/L
Differential count
Neutrophils-segmented	Whole blood	/µL		0.001		×10⁹/L
Neutrophils-bands	Whole blood	/µL		0.001		×10⁹/L
Lymphocytes	Whole blood	/µL		0.001		×10⁹/L
Monocytes	Whole blood	/µL		0.001		×10⁹/L
Eosinophils	Whole blood	/µL		0.001		×10⁹/L
Basophils	Whole blood	/µL		0.001		×10⁹/L
Differential count (number fraction)
Neutrophils-segmented	Whole blood	%		0.01		Proportion of 1.0
Neutrophils-bands	Whole blood	%		0.01		Proportion of 1.0
Lymphocytes	Whole blood	%		0.01		Proportion of 1.0
Monocytes	Whole blood	%		0.01		Proportion of 1.0
Eosinophils	Whole blood	%		0.01		Proportion of 1.0
Basophils	Whole blood	%		0.01		Proportion of 1.0
Zidovudine	Serum, plasma	µg/mL		3.7		µmol/L
Zinc	Serum	µg/dL		0.153		µmol/L

^aThe laboratory values are provided for illustration only and are not intended to be comprehensive or definitive. Each laboratory determines its own values.

The information in this table is adapted from and based on the following sources: (1) Kratz A, Ferraro M, Sluss PM, Lewandrowski KB. Laboratory reference values. N Engl J Med. 2004;351(15):1548-1563; (2) Young DS, Huth EJ. SI Units for Clinical Measurement. Philadelphia, PA: American College of Physicians; 1998; (3) McPherson R, Pincus M, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 22 ed. Elsevier Saunders; 2012; (4) Goldman L, Schaeffer AI. Goldman-Cecil Medicine. 25th ed. Elsevier Saunders; 2015; (5) Longo D, et al. Harrison's Principles of Internal Medicine. 18th ed. McGraw-Hill Professional; 2011; (6) Lipoprotein a Foundation. Accessed August 1, 2019. https://www.lipoproteinafoundation.org./page/UnderstandLPA ; (7) Laposta M, ed. Laboratory Medicine: The Diagnosis of Disease in the Clinical Laboratory. 2nd ed. McGraw-Hill Education; 2014

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date: 22 May 2022

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Table 1. Conversions to Metric Measures

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