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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.

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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, With Reference Ranges and Conversion Factors

 

Analyte Specimen Reference Range, Conventional Unit Conventional Unit Enter Quantity Conversion Factor (Multiply by) Reference Range, SI Unit Conversion Result SI Unit Convert
Acetaminophen
Serum, plasma
10-30
µg/mL
6.614
66-200
µmol/L
Acetoacetate
Serum, plasma
<1
mg/dL
97.95
<100
µmol/L
Acetone
Serum, plasma
<1.0
mg/dL
0.172
<0.17
mmol/L
Acid phosphatase
Serum
<5.5
U/L
16.667
<90
nkat/L
Activated partial thromboplastin time (APTT)
Whole blood
25-40
s
1
25-40
s
Adenosine deaminase
Serum
11.5-25.0
U/L
16.667
190-420
nkat/L
Adrenocorticotropic hormone (ACTH)
Plasma
<120
pg/mL
0.22
<26
pmol/L
Alanine
Plasma
1.87-5.89
mg/dL
112.2
210-661
µmol/L
Alanine aminotransferase (ALT)
Serum
10-40
U/L
0.0167
0.17-0.68
µkat/L
Albumin
Serum
3.5-5.0
g/dL
10
35-50
g/L
Alcohol dehydrogenase
Serum
<2.8
U/L
16.667
<47
nkat/L
Aldolase
Serum
1.0-7.5
U/L
0.0167
0.02-0.13
µkat/L
Aldosterone
Serum, plasma
2-9
ng/dL
27.74
55-250
pmol/L
Alkaline phosphatase
Serum
30-120
U/L
0.0167
0.5-2.0
µkat/L
Alprazolam
Serum, plasma
10-50
ng/mL
3.24
32-162
nmol/L
Amikacin
Serum, plasma
20-30
µg/mL
1.708
34-52
µmol/L
U+03B1-Aminobutyric acid
Plasma
0.08-0.36
mg/dL
96.97
8-35
µmol/L
U+03B4-Aminolevulinic acid
Serum
15-23
µg/dL
0.0763
1.1-8.0
µmol/L
Amiodarone
Serum, plasma
0.5-2.5
µg/mL
1.55
0.8-3.9
µmol/L
Amitriptyline
Plasma
120-250
ng/mL
3.605
433-903
nmol/L
Ammonia (as nitrogen)
Serum, plasma
15-45
µg/dL
0.714
11-32
µmol/L
Amobarbital
Serum
1-5
µg/mL
4.42
4-22
µmol/L
Amphetamine
Serum, plasma
20-30
ng/mL
7.4
148-222
nmol/L
Amylase
Serum
27-131
U/L
0.0167
0.46-2.23
µkat/L
Androstenedione
Serum
75-205
ng/dL
0.0349
2.6-7.2
nmol/L
Angiotensin I
Plasma
<25
pg/mL
0.772
<15
pmol/L
Angiotensin II
Plasma
10-60
pg/mL
0.957
0.96-58
pmol/L
Angiotensin-converting enzyme
Serum
<40
U/L
16.667
<670
nkat/L
Anion gap Na+–(Cl- + HCO3-)
Serum, plasma
8-16
mEq/L
1
8-16
mmol/L
Antidiuretic hormone (ADH)
Plasma
1-5
pg/mL
0.923
0.9-4.6
pmol/L
Antithrombin III
Plasma
21-30
mg/dL
10
210-300
mg/L
U+03B11- Antitrypsin
Serum
78-200
mg/dL
0.184
14.5-36.5
µmol/L
Apolipoprotein A-I
Serum
80-151
mg/dL
0.01
0.8-1.5
g/L
Apolipoprotein B
Serum, plasma
50-123
mg/dL
0.01
0.5-1.2
g/L
Arginine
Serum
0.37-2.40
mg/dL
57.05
21-138
µmol/L
Arsenic
Whole blood
<2-23
µg/L
0.0133
0.03-0.31
µmol/L
Asparagine
Plasma
0.40-0.91
mg/dL
75.689
30-69
µmol/L
Aspartate aminotransferase (AST)
Serum
10-30
U/L
0.0167
0.17-0.51
µkat/L
Aspartic acid
Plasma
<0.3
mg/dL
75.13
<25
µmol/L
Atrial natriuretic hormone
Plasma
20-77
pg/mL
0.325
6.5-2.5
pmol/L
Base excess
Whole blood
2 to 3
mEg/L
1
2 to 3
mmol/L
Bicarbonate
Serum
21-28
mEq/L
1
21-28
mmol/L
Bile acids (total)
Serum
0.3-2.3
µg/mL
2.448
0.73-5.63
µmol/L
Bilirubin, total
Serum
0.3-1.2
mg/dL
17.104
5.0-21.0
µmol/L
Bilirubin, direct (conjugated)
Serum
0.1-0.3
mg/dL
17.104
1.7-5.1
µmol/L
Biotin
Serum
200-500
pg/mL
0.00409
0.82-2.05
nmol/L
Bismuth
Whole blood
1-12
µg/L
4.785
4.8-57.4
nmol/L
Blood gases
    Carbon dioxide, Pco2
Arterial blood
35-45
mm Hg
0.133
4.7-5.9
kPa
    pH
Arterial blood
7.35-7.45
 
1
7.35-7.45
 
    Oxygen, Po2
Arterial blood
80-100
mm Hg
0.133
11-13
kPa
Brain-type natriuretic peptide (BNP)
Plasma
<167
pg/mL
1
<167
ng/L
Bromide (toxic)
Serum
>1250
µg/mL
0.0125
>15.6
mmol/L
C1 esterase inhibitor
Serum
12-30
mg/dL
10
120-300
mg/L
C3 complement
Serum
1200-1500
µg/mL
0.001
1.2-1.5
g/L
C4 complement
Serum
350-600
µg/mL
0.001
0.35-0.60
g/L
Cadmium
Whole blood
0.3-1.2
µg/L
8.896
2.7-10.7
nmol/L
Caffeine
Serum, plasma
3-15
µg/L
0.515
2.5-7.5
µmol/L
Calcitonin
Plasma
3-26
pg/mL
0.292
0.8-7.6
pmol/L
Calcium, ionized
Serum
4.60-5.08
mg/dL
0.25
1.15-1.27
mmol/L
Calcium, total
Serum
8.2-10.2
mg/dL
0.25
2.05-2.55
mmol/L
Cancer antigen (CA) 125
Serum
<35
U/mL
1
<35
kU/L
Carbamazepine
Serum, plasma
8-12
µg/mL
4.233
34-51
µmol/L
Carbon dioxide (total)
Serum, plasma
22-28
mEq/L
1
22-28
mmol/L
Carboxyhemoglobin, toxic
Whole blood
>20
%
0.01
>0.2
Proportion of 1.0
Carcinoembryonic antigen (CEA)
Serum
<3.0
ng/mL
1
<3.0
µg/L
U+03B2-Carotene
Serum
10-85
µg/dL
0.01863
0.2-1.6
µmol/L
Carotenoids
Serum
50-300
µg/dL
0.01863
0.9-5.6
µmol/L
Ceruloplasmin
Serum
20-40
mg/dL
10
200-400
mg/L
Chloramphenicol
Serum
10-25
µg/mL
3.095
31-77
µmol/L
Chlordiazepoxide
Serum, plasma
0.4-3.0
µg/mL
3.336
1.3-10.0
µmol/L
Chloride
Serum, plasma
96-106
mEq/L
1
96-106
mmol/L
Chlorpromazine
Plasma
50-300
ng/mL
3.126
157-942
nmol/L
Chlorpropamide
Plasma
75-250
mg/L
3.61
270-900
µmol/L
 
 
 
 
 
 
 
 
 
Cholesterol (total)
    Desirable
Serum, plasma
<200
mg/dL
0.0259
<5.18
mmol/L
    Borderline high
Serum, plasma
200-239
mg/dL
0.0259
5.18-6.18
mmol/L
    High
Serum, plasma
U+2265240
mg/dL
0.0259
U+2265 6.21
mmol/L
Cholesterol, high-density (HDL) (low level)
Serum, plasma
<40
mg/dL
0.0259
<1.03
mmol/L
Cholesterol, low-density (LDL) (high level)
Serum, plasma
>160
mg/dL
0.0259
4.144
mmol/L
Cholinesterase
Serum
5-12
mg/L
2.793
14-39
nmol/L
Chorionic gonadotropin (ß-hCG) (nonpregnant)
Serum
5
mIU/mL
1
5
IU/L
Chromium
Whole blood
0.7-28.0
µg/L
19.232
13.4-538.6
nmol/L
Citrate
Serum
1.2-3.0
mg/dL
52.05
60-160
µmol/L
Citrulline
Plasma
0.2-1.0
mg/dL
57.081
12-55
µmol/L
Clonazepam
Serum
10-50
ng/mL
0.317
0.4-15.8
nmol/L
Clonidine
Serum, plasma
1.0-2.0
ng/mL
4.35
4.4-8.7
nmol/L
Clozapine
Serum
200-350
ng/mL
0.003
0.6-1.0
µmol/L
Coagulation factor I
Plasma
0.15-0.35
g/dL
29.41
4.4-10.3
µmol/L
    (Fibrinogen)
Plasma
150-350
mg/dL
0.01
1.5-3.5
g/L
Coagulation factor II (prothrombin)
Plasma
70-130
%
0.01
0.70-1.30
Proportion of 1.0
Coagulation factor V
Plasma
70-130
%
0.01
0.70-1.30
Proportion of 1.0
Coagulation factor VII
Plasma
60-140
%
0.01
0.60-1.40
Proportion of 1.0
Coagulation factor VIII
Plasma
50-200
%
0.01
0.50-2.00
Proportion of 1.0
Coagulation factor IX
Plasma
70-130
%
0.01
0.70-1.30
Proportion of 1.0
Coagulation factor X
Plasma
70-130
%
0.01
0.70-1.30
Proportion of 1.0
Coagulation factor XI
Plasma
70-130
%
0.01
0.70-1.30
Proportion of 1.0
Coagulation factor XII
Plasma
70-130
%
0.01
0.70-1.30
Proportion of 1.0
Cobalt
Serum
4.0-10.0
µg/L
16.968
67.9-169.7
nmol/L
Cocaine (toxic)
Serum
>1000
ng/mL
3.297
>3300
nmol/L
Codeine
Serum
10-100
ng/mL
3.34
33-334
nmol/L
Coenzyme Q10 (ubiquinone)
Plasma
0.5-1.5
µg/mL
1
0.5-1.5
mg/L
Copper
Serum
70-140
µg/dL
0.157
44866
µmol/L
Coproporphyrin
Urine
<200
µg/24 h
1.527
<300
µmol/d
Corticotropin
Plasma
<120
pg/mL
0.22
<26
pmol/L
Cortisol
Serum, plasma
5-25
µg/dL
27.588
140-690
nmol/L
Cotinine
Plasma
0-8
µg/L
5.675
0-45
nmol/L
C-peptide
Serum
0.5-2.5
ng/mL
0.331
0.17-0.83
nmol/L
C-reactive protein
Serum
0.08-3.1
mg/L
9.524
0.76-28.5
nmol/L
Creatine
Serum
0.1-0.4
mg/dL
76.25
8-31
µmol/L
Creatine kinase (CK)
Serum
40-150
U/L
0.0167
0.67-2.5
µkat/L
Creatine kinase–MB fraction
Serum
0-7
ng/mL
1
0-7
µg/L
Creatinine
Serum, plasma
0.6-1.2
mg/dL
88.4
53-106
µmol/L
Creatinine clearance
Serum, plasma
75-125
mL/min/1.73m2
0.0167
1.24-2.08
mL/s/m2
Cyanide (toxic)
Whole blood
>1.0
µg/mL
23.24
>23
µmol/L
Cyclic adenosine monophosphate (cAMP)
Plasma
4.6-8.6
ng/mL
3.04
14-26
µmol/L
Cyclosporine
Serum
100-400
ng/mL
0.832
83-333
nmol/L
Cystine
Plasma
0.40-1.40
mg/dL
41.615
16-60
µmol/L
D-dimer
Plasma
<0.5
µg/mL
5.476
<3.0
nmol/L
Dehydroepiandrosterone (DHEA)
Serum
1.8-12.5
ng/mL
3.47
6.2-43.3
nmol/L
Dehydroepiandrosterone sulfate (DHEA-S)
Serum
50-450
µg/dL
0.027
1.6-12.2
µmol/L
Deoxycorticosterone
Serum
2-19
ng/dL
0.0303
61-576
nmol/L
Desipramine
Serum, plasma
50-200
ng/mL
3.754
170-700
nmol/L
Diazepam
Serum, plasma
100-1000
ng/mL
0.0035
0.35-3.51
µmol/L
Digoxin
Plasma
0.5-2.0
ng/mL
1.281
0.6-2.6
nmol/L
Diltiazem
Serum
<200
mg/L
2.412
<480
µmol/L
Disopyramide
Serum, plasma
2.8-7.0
µg/mL
2.946
8.3-22.0
µmol/L
Dopamine
Plasma
<87
pg/mL
6.528
<475
pmol/L
Doxepin
Serum, plasma
30-150
ng/mL
3.579
108-538
nmol/L
Electrophoresis (protein)
    Proportion of total protein
        Albumin
Serum
52-65
%
0.01
0.52-0.65
Proportion of 1.0
        U+03B1 1- Globulin
Serum
2.5-5.0
%
0.01
0.025-0.05
Proportion of 1.0
        U+03B12- Globulin
Serum
7.0-13.0
%
0.01
0.07-0.13
Proportion of 1.0
        ß- Globulin
Serum
8.0-14.0
%
0.01
0.08-0.14
Proportion of 1.0
        U+03B3-Globulin
Serum
12.0-22.0
%
0.01
0.12-0.22
Proportion of 1.0
    Concentration
        Albumin
Serum
3.2-5.6
g/dL
10
32-56
g/L
        U+03B1 1 - Globulin
Serum
0.1-0.4
g/dL
10
1-10
g/L
        U+03B1 2 - Globulin
Serum
0.4-1.2
g/dL
10
4-12
g/L
        ß- Globulin
Serum
0.5-1.1
g/dL
10
5-11
g/L
        U+03B3-Globulin
Serum
0.5-1.6
g/dL
10
5-16
g/L
Ephedrine (toxic)
Serum
>2
µg/mL
6.052
>12.1
µmol/L
Epinephrine
Plasma
<60
pg/mL
5.459
<330
pmol/L
Erythrocyte sedimentation rate
Whole blood
0-20
mm/h
1
0-20
mm/h
Erythropoietin
Serum
5-36
IU/L
1
5-36
IU/L
Estradiol (E 2 )
Serum
30-400
pg/mL
3.671
110-1470
pmol/L
Estriol (E 3 )
Serum
5-40
ng/mL
3.467
17.4-138.8
nmol/L
Estrogens (total)
Serum
60-400
pg/mL
1
60-400
ng/L
Estrone (E 1 )
Serum, plasma
1.5-25.0
pg/mL
3.698
5.5-92.5
pmol/L
Ethanol (ethyl alcohol)
Serum, whole blood
<20
mg/dL
0.2171
<4.3
mmol/L
Ethchlorvynol (toxic)
Serum, plasma
>20
µg/mL
6.915
>138
µmol/L
Ethosuximide
Serum
40-100
mg/L
7.084
280-700
µmol/L
Ethylene glycol (toxic)
Serum, plasma
>30
mg/dL
0.1611
>5
mmol/L
Fatty acids (nonesterified)
Serum, plasma
8-25
mg/dL
0.0355
0.28-0.89
mmol/L
Fecal fat (as stearic acid)
Stool
2.0-6.0
g/d
1
2-6
g/24 h
Fenfluramine
Serum
0.04-0.30
µg/mL
4.324
0.18-1.30
µmol/L
Fentanyl
Serum
0.01-0.10
µg/mL
2.972
0.02-0.30
µmol/L
Ferritin
Serum
15-200
ng/mL
2.247
33-450
pmol/Lng/mL
U+03B1 1 - Fetoprotein
Serum
<10
ng/mL
1
<10
µg/L
Fibrin degradation products
Plasma
<10
µg/mL
1
<10
mg/L
Fibrinogen
Plasma
200-400
mg/dL
0.0294
5.8-11.8
µmol/L
Flecanide
Serum, plasma
0.2-1.0
µg/mL
2.413
0.5-2.4
µmol/L
Fluoride
Whole blood
<0.05
mg/dL
0.5263
<0.027
mmol/L
Fluoxetine
Serum
200-1100
ng/mL
0.00323
0.65-3.56
µmol/L
Flurazepam (toxic)
Serum, plasma
>0.2
µg/mL
2.5
>0.5
µmol/L
Folate (folic acid)
Serum
3-16
ng/mL
2.266
7-36
nmol/L
Follicle-stimulating hormone (FSH)
Serum, plasma
1-100
mIU/mL
1
1-100
IU/L
Fructosamine
Serum
36-50
mg/L
5.581
200-280
mmol/L
Fructose
Serum
1-6
mg/dL
55.506
55-335
µmol/L
Galactose
Serum, plasma
<20
mg/dL
0.0555
<1.10
mmol/L
Gastrin
Serum
25-90
pg/mL
0.481
12-45
pmol/L
Gentamicin
Serum
6-10
µg/mL
2.09
12-21
µmol/L
Glucagon
Plasma
20-100
pg/mL
1
20-100
ng/L
Glucose
Serum
70-110
mg/dL
0.0555
3.9-6.1
mmol/L
Glucose-6-phosphate dehydrogenase
Whole blood
10-14
U/g hemoglobin
0.0167
0.17-0.24
nkat/g hemoglobin
Glutamic acid
Plasma
0.2-2.8
mg/dL
67.967
15-190
µmol/L
Glutamine
Plasma
6.1-10.2
mg/dL
68.423
420-700
µmol/L
U+03B3-Glutamyltransferase (GGT)
Serum
2-30
U/L
0.0167
0.03-0.51
µkat/L
Glutethimide
Serum
2-6
µg/mL
4.603
9-28
µmol/L
Glycerol (free)
Serum
0.3-1.72
mg/dL
0.1086
0.32-0.187
mmol/L
Glycine
Plasma
0.9-4.2
mg/dL
133.2
120-560
µmol/L
Gold
Serum
<10
µg/dL
50.77
<500
nmol/L
Growth hormone (GH)
Serum
0-18
ng/mL
1
0-18
µg/L
Haloperidol
Serum, Plasma
6-24
ng/mL
2.66
16-65
nmol/L
Haptoglobin
Serum
26-185
mg/dL
10
260-1850
mg/L
Hematocrit
Whole blood
41-50
%
0.01
0.41-0.50
Proportion of 1.0
Hemoglobin
Whole blood
14.0-17.5
g/dL
10
140-175
g/L
    Mean corpuscular hemoglobin (MCH)
Whole blood
26-34
pg/cell
1
26-34
pg/cell
    Mean corpuscular hemoglobin concentration (MCHC)
Whole blood
33-37
g/dL
10
330-370
g/L
    Mean corpuscular volume (MCV)
Whole blood
80-100
µm3
1
80-100
fL
Hemoglobin A 1c (glycated hemoglobin)
Whole blood
4-7
% of total hemoglobin
0.01
0.04-0.07
Proportion of total hemoglobin
Hemoglobin A 2
Whole blood
2.0-3.0
%
0.01
0.02-0.03
Proportion of 1.0
Histamine
Plasma
0.5-1.0
µg/L
8.997
4.5-9.0
nmol/L
Histidine
Plasma
0.5-1.7
mg/dL
64.45
32-110
µmol/L
Homocysteine
Plasma
0.68-2.02
mg/L
7.397
5-15
µmol/L
Homovanillic acid
Urine
1.4-8.8
mg/24 h
5.489
8-48
µmol/d
Hydrocodone
Serum
<0.02
µg/mL
3.34
<0.06
µmol/L
Hydromorphone
Serum
0.008-0.032
µg/mL
3504
28-112
nmol/L
U+03B2-Hydroxybutyric acid
Plasma
<3.0
mg/dL
96.06
<300
µmol/L
5-Hydroxyindoleacetic acid (5-HIAA)
Urine
2-6
mg/24 h
5.23
10.4-31.2
µmol/d
Hydroxyproline
Plasma
<0.55
mg/dL
76.266
<42
µmol/L
Ibuprofen
Serum
10-50
µg/mL
4.848
50-243
µmol/L
Imipramine
Plasma
150-250
ng/mL
3.566
536-893
nmol/L
Immunoglobulin A (IgA)
Serum
40-350
mg/dL
10
400-3500
mg/L
Immunoglobulin D (IgD)
Serum
0-8
mg/dL
10
0-80
mg/L
Immunoglobulin E (IgE)
Serum
0-1500
µg/L
0.001
0-1.5
mg/L
Immunoglobulin G (IgG)
Serum
650-1600
mg/dL
0.01
6.5-16.0
g/L
Immunoglobulin M (IgM)
Serum
54-300
mg/dL
10
550-3000
mg/L
Insulin
Serum
2.0-20
µIU/mL
6.945
14-140
pmol/L
Insulinlike growth factor
Serum
130-450
ng/mL
0.131
18-60
nmol/L
Iodine
Serum
58-77
µg/L
7.88
450-580
nmol/L
Iron
Serum
60-150
µg/dL
0.179
10.7-26.9
µmol/L
Iron-binding capacity
Serum
250-450
µg/dL
0.179
44.8-80.6
µmol/L
Isoleucine
Plasma
0.5-1.3
mg/dL
76.236
40-100
µmol/L
Isoniazid
Plasma
1-7
µg/mL
7.291
7-51
µmol/L
Isopropanol (toxic)
Serum, plasma
>400
mg/L
0.0166
>6.64
mmol/L
Kanamycin
Serum, plasma
25-35
µg/mL
2.08
52-72
µmol/L
Ketamine
Serum
0.2-6.3
µg/mL
4.206
0.8-26
µmol/L
17-Ketosteroids
Urine
3-12
mg/24 h
3.33
10-42
µmol/d
Lactate
Plasma
5.0-15
mg/dL
0.111
0.6-1.7
mmol/L
Lactate dehydrogenase (LDH)
Serum
100-200
U/L
0.0167
1.7-3.4
µkat/L
LDH isoenzymes
    LD1
Serum
17-27
%
0.01
0.17-0.27
Proportion of 1.0
    LD2
Serum
27-37
%
0.01
0.27-0.37
Proportion of 1.0
    LD3
Serum
18-25
%
0.01
0.18-0.25
Proportion of 1.0
    LD4
Serum
3-8
%
0.01
0.03-0.08
Proportion of 1.0
    LD5
Serum
0-5
%
0.01
0-0.05
Proportion of 1.0
Lead
Serum
<10-20
µg/dL
0.0483
<0.5-1.0
µmol/L
Leucine
Plasma
1.0-2.3
mg/dL
76.237
75-175
µmol/L
Lidocaine
Serum, plasma
1.5-6.0
µg/mL
4.267
6.4-25.6
µmol/L
Lipase
Serum
31-186
U/L
0.0167
0.5-3.2
µkat/L
Lipoprotein(a) [Lp(a)]
Serum
10-30
mg/dL
0.0357
0.35-1.0
µmol/L
Lithium
Serum
0.6-1.2
mEq/L
1
0.6-1.2
mmol/L
Lorazepam
Serum
50-240
ng/mL
3.114
156-746
nmol/L
Luteinizing hormone (LH)
Serum, plasma
1-104
mIU/mL
1
1-104
IU/L
Lycopene
Serum
0.15-0.25
mg/L
1.863
0.28-0.46
µmol/L
Lysergic acid diethylamide
Serum
<0.004
µg/mL
3726
<15
nmol/L
Lysine
Plasma
1.2-3.5
mg/dL
68.404
80-240
µmol/L
Lysozyme
Serum, plasma
0.4-1.3
mg/dL
10
4-13
mg/L
Magnesium
Serum
1.3-2.1
mEq/L
0.5
0.65-1.05
mmol/L
Manganese
Whole blood
10-12
µg/L
18.202
182-218
nmol/L
Maprotiline
Plasma
200-600
ng/mL
1
200-600
µg/L
Melatonin
Serum
10-15
ng/L
4.305
45-66
pmol/L
Meperidine
Serum, plasma
400-700
ng/mL
4.043
1620-2830
nmol/L
Mercury
Serum
<5
µg/L
4.985
<25
nmol/L
Metanephrine (total)
Urine
<1.0
mg/24 h
5.07
<5
µmol/d
Metformin
Serum
1-4
µg/mL
7.742
8-30
µmol/L
Methadone
Serum, plasma
100-400
ng/mL
0.00323
0.32-1.29
µmol/L
Methamphetamine
Serum
0.01-0.05
µg/mL
6.7
0.07-0.34
µmol/L
Methanol
Plasma
<200
µg/mL
0.0312
<6.2
mmol/L
Methaqualone
Serum, plasma
2-3
µg/mL
4
8-12
µmol/L
Methemoglobin
Whole blood
<0.24
g/dL
155
<37.2
µmol/L
Methemoglobin
Whole blood
<1.0
% of total hemoglobin
0.01
<0.01
Proportion of total hemoglobin
Methicillin
Serum
8-25
mg/L
2.636
22-66
µmol/L
Methionine
Plasma
0.1-0.6
mg/dL
67.02
6-40
µmol/L
Methotrexate
Serum, plasma
0.04-0.36
mg/L
2200
90-790
nmol/L
Methyldopa
Plasma
1-5
µg/mL
4.735
5.0-25
µmol/L
Metoprolol
Serum, plasma
75-200
ng/mL
3.74
281-748
nmol/L
ß 2 -Microglobulin
Serum
1.2-2.8
mg/L
1
1.2-2.8
mg/L
Morphine
Serum, plasma
10-80
ng/mL
3.504
35-280
nmol/L
Myoglobin
Serum
19-92
µg/L
0.0571
1.0-5.3
nmol/L
Naproxen
Serum
26-70
µg/mL
4.343
115-300
µmol/L
Niacin (nicotinic acid)
Urine
2.4-6.4
mg/24 h
7.3
17.5-46.7
µmol/d
Nickel
Whole blood
1.0-28.0
µg/L
17.033
17-476
nmol/L
Nicotine
Plasma
0.01-0.05
mg/L
6.164
0.062-0.308
µmol/L
Nitrogen (nonprotein)
Serum
20-35
mg/dL
0.714
14.3-25.0
mmol/L
Nitroprusside (as thiocyanate)
 
6-29
µg/mL
17.2
103-500
µmol/L
Norepinephrine
Plasma
110-410
pg/mL
5.911
650-2423
pmol/L
Nortriptyline
Serum, plasma
50-150
ng/mL
3.797
190-570
nmol/L
Ornithine
Plasma
0.4-1.4
mg/dL
75.666
30-106
µmol/L
Osmolality
Serum
275-295
mOsm/kg
1
275-295
mmol/kg
Osteocalcin
Serum
3.0-13.0
ng/mL
1
3.0-13.0
µg/L
Oxalate
Serum
1.0-2.4
mg/mL
11.107
11-27
µmol/L
Oxazepam
Serum, plasma
0.2-1.4
µg/mL
3.487
0.7-4.9
µmol/L
Oxycodone
Serum
10-100
ng/mL
3.171
32-317
nmol/L
Oxygen, partial pressure (Po 2 )
Arterial blood
80-100
mm Hg
0.133
11-13
kPa
Paraquat
Whole blood
0.1-1.6
µg/mL
5.369
0.5-8.5
µmol/L
Parathyroid hormone
Serum
10-65
pg/mL
1
10-65
ng/L
Pentobarbital
Serum, plasma
1-5
µg/mL
4.439
4.0-22
µmol/L
Pepsinogen
Serum
28-100
ng/mL
1
28-100
µg/L
Phencyclidine (toxic)
Serum, plasma
90-800
ng/mL
4.109
370-3288
nmol/L
Phenobarbital
Serum, plasma
15-40
µg/mL
4.31
65-172
µmol/L
Phenylalanine
Plasma
0.6-1.5
mg/dL
60.544
35-90
µmol/L
Phenylpropanolamine
Serum
0.05-0.10
µg/mL
6613
330-660
nmol/L
Phenytoin
Serum, plasma
10-20
mg/L
3.968
40-79
µmol/L
Phosphorus (inorganic)
Serum
2.3-4.7
mg/dL
0.323
0.74-1.52
mmol/L
Placental lactogen
Serum
0.5-1.1
µg/mL
46.296
23-509
nmol/L
Plasminogen (antigenic)
Plasma
10-20
mg/dL
0.113
1.1-2.2
µmol/L
Plasminogen activator inhibitor
Plasma
4-40
ng/mL
19.231
75-750
pmol/L
Platelet count (thrombocytes)
Whole blood
150-350
×103L
1
150-350
×109/L
Porphyrins (total)
Urine
20-120
µg/L
1.203
25-144
nmol/L
Potassium
Serum
3.5-5.0
mEq/L
1
3.5-5.0
mmol/L
Prealbumin
Serum
19.5-35.8
mg/dL
10
195-358
mg/L
Pregnanediol
Urine
<2.6
mg/24 h
3.12
<8
µmol/d
Pregnanetriol
Urine
<2.5
mg/24 h
2.972
<7.5
µmol/d
Primidone
Serum, plasma
5-12
µg/mL
4.582
23-55
µmol/L
Procainamide
Serum, plasma
4-10
µg/mL
4.25
17-42
µmol/L
Progesterone
Serum
0.15-25
ng/mL
3.18
0.5-79.5
nmol/L
Prolactin
Serum
3.8-23.2
µg/L
43.478
165-1010
pmol/L
Proline
Plasma
1.2-3.9
mg/dL
86.858
104-340
µmol/L
Propoxyphene
Plasma
0.1-0.4
µg/mL
2.946
0.3-1.2
µmol/L
Propranolol
Serum
50-100
ng/mL
3.856
193-386
nmol/L
Prostate-specific antigen
Serum
<4.0
ng/mL
1
<4.0
µg/L
Protein (total)
Serum
6.0-8.0
g/dL
10
60-80
g/L
Prothrombin time (PT)
Plasma
10-13
s
1
10-13
s
Protoporphyrin
Red blood cells
15-50
µg/dL
0.0178
0.27-0.89
µmol/L
Protriptyline
Serum, plasma
70-250
µg/dL
3.787
266-950
nmol/L
Pyruvate
Plasma
0.5-1.5
mg/dL
113.56
60-170
µmol/L
Quinidine
Serum
2.0-5.0
µg/mL
3.082
6.2-15.4
µmol/L
Red blood cell count
Whole blood
3.9-5.5
×106L
1
3.9-5.5
×1012/L
Renin
Plasma
30-40
pg/mL
0.0237
0.7-1.0
pmol/L
Reticulocyte count
Whole blood
25-75
×103L
1
25-75
×109/L
Reticulocyte count
Whole blood
0.5-1.5
% of red blood cells
0.01
0.005-0.015
Proportion of red blood cells
Rifampin
Serum
4-40
mg/L
1.215
5-49
µmol/L
Salicylates
Serum, plasma
150-300
µg/mL
7.24
1086-2172
µmol/L
Selenium
Serum, plasma
58-234
µg/L
0.0127
0.74-2.97
µmol/L
Serine
Plasma
0.7-2.0
mg/dL
95.156
65-193
µmol/L
Serotonin (5-hydroxytryptamine)
Whole blood
50-200
ng/mL
0.00568
0.28-1.14
µmol/L
Sex hormone-binding globulin
Serum
1.5-2.0
µg/mL
8.896
13-17
nmol/L
Sodium
Serum
136-142
mEq/L
1
136-142
mmol/L
Somatomedin C (Insulinlike growth factor)
Serum
130-450
ng/mL
0.131
18-60
nmol/L
Somatostatin
Plasma
<25
pg/mL
0.611
<15
pmol/L
Streptomycin
Serum
7-50
mg/L
1.719
12-86
µmol/L
Strychnine
Whole blood
<0.5
mg/L
2.99
<1.5
µmol/L
Substance P
Plasma
<240
pg/mL
0.742
<180
pmol/L
Sulfate
Serum
10-32
mg/L
31.188
310-990
µmol/L
Sulfmethemoglobin
Whole blood
<1.0
% of total hemoglobin
0.01
<0.010
Proportion of total hemoglobin
Taurine
Plasma
0.3-2.1
mg/dL
79.91
24-168
µmol/L
Testosterone
Serum
300-1200
ng/dL
0.0347
10.4-41.6
nmol/L
Tetrahydrocannabinol
Serum
<0.20
µg/mL
3.18
<0.60
µmol/L
Theophylline
Serum, plasma
10-20
µg/mL
5.55
56-111
µmol/L
Thiopental
Serum, plasma
1-5
µg/mL
4.144
4.1-20.7
µmol/L
Thioridazine
Serum, plasma
1.0-1.5
µg/mL
2.699
2.7-4.1
µmol/L
Threonine
Plasma
0.9-2.5
mg/dL
84
75-210
µmol/L
Thrombin time
Plasma
16-24
s
1
16.24
s
Thyroglobulin
Serum
3-42
ng/mL
1
3-42
µg/L
Thyrotropin
Serum
0.4-4.2
mIU/L
1
0.4-4.2
mIU/L
Thyroxine, free (FT 4 )
Serum
0.9-2.3
ng/dL
12.871
12-30
pmol/L
Thyroxine, total (T 4 )
Serum
5.5-12.5
µg/mL
17.094
206-309
nmol/L
Thyroxine-binding globulin
Serum
16.0-24.0
µg/mL
17.094
206-309
nmol/L
Tissue plasminogen activator
Plasma
<0.04
IU/mL
1000
<40
IU/L
Tobramycin
Serum, plasma
5-10
µg/mL
2.139
10-21
µmol/L
Tocainide
Serum
4-10
µg/mL
5.201
21-52
µmol/L
Tolbutamide
Serum
80-240
µg/mL
3.7
296-888
µmol/L
Transferrin
Serum
200-400
mg/dL
0.123
2.5-5.0
µmol/L
Triglycerides
Serum
<160
mg/dL
0.0113
1.8
mmol/L
Triiodothyronine, free (FT3)
Serum
130-450
pg/dL
0.0154
2.0-7.0
pmol/L
Triiodothyronine, total (T3)
Serum
60-180
ng/dL
0.0154
0.92-2.76
nmol/L
Troponin I
Serum
0-0.4
ng/mL
1
0-0.4
µg/L
Troponin T
Serum
0-0.1
ng/mL
1
0-0.1
µg/L
Tryptophan
Plasma
0.5-1.5
mg/dL
48.967
25-73
µmol/L
Tyrosine
Plasma
0.4-1.6
mg/dL
55.19
20-90
µmol/L
Urea nitrogen
Serum
8-23
mg/dL
0.357
2.9-8.2
mmol/L
Uric acid
Serum
4.0-8.0
mg/dL
59.485
240-480
µmol/L
Urobilinogen
Urine
1-3.5
mg/24 h
1.7
1.7-5.9
µmol/d
Valine
Plasma
1.7-3.7
mg/dL
85.361
145-315
µmol/L
Valproic acid
Serum, plasma
50-100
µg/mL
6.934
346-693
µmol/L
div class="si_cell">Vancomycin
Serum, plasma
20-40
µg/mL
0.69
14-28
µmol/L
Vanillylmandelic acid (VMA)
Urine
2.1-7.6
mg/24 h
5.046
11-38
µmol/d
Vasoactive intestinal polypeptide
Plasma
<50
pg/mL
0.296
<15
pmol/L
Vasopressin
Plasma
1.5-2.0
pg/mL
0.923
1.0-2.0
pmol/L
Verapamil
Serum, Plasma
100-500
ng/mL
2.2
220-1100
nmol/L
Vitamin A (retinol)
Serum
30-80
µg/dL
0.0349
1.05-2.80
µmol/L
Vitamin B1 (thiamine)
Serum
0-2
µg/dL
29.6
0-75
nmol/L
Vitamin B2 (riboflavin)
Serum
4-24
µg/dL
26.6
106-638
nmol/L
Vitamin B3
Whole blood
0.2-1.8
µg/mL
4.56
0.9-8.2
µmol/L
Vitamin B6 (pyridoxine)
Plasma
5-30
ng/mL
4.046
20-121
nmol/L
Vitamin B12
Serum
160-950
pg/mL
0.7378
118-701
pmol/L
Vitamin C (ascorbic acid)
Serum
0.4-1.5
mg/dL
56.78
23-85
µmol/L
Vitamin D (1,25 dihydroxyvitamin D)
Serum
25-45
pg/mL
2.6
60-108
pmol/L
Vitamin D (25-hydroxyvitamin D)
Plasma
14-60
ng/mL
2.496
35-150
nmol/L
Vitamin E (a-tocopherol)
Serum
43221
µg/mL
23.22
15676
µmol/L
Vitamin K
Serum
0.13-1.19
ng/mL
2.22
0.29-2.64
nmol/L
Warfarin
Serum, plasma
1.0-10
µg/mL
3.247
3.2-32.4
µmol/L
White blood cell count
Whole blood
4500-11000
L
0.001
4.5-11.0
×109/L
    Differential count
        Neutrophils-segmented
Whole blood
1800-7800
L
0.001
1.8-7.8
×109/L
        Neutrophils-bands
Whole blood
0-700
L
0.001
0-0.70
×109/L
        Lymphocytes
Whole blood
1000-4800
L
0.001
1.0-4.8
×109/L
        Monocytes
Whole blood
0-800
L
0.001
0-0.80
×109/L
        Eosinophils
Whole blood
0-450
L
0.001
0-0.45
×109/L
        Basophils
Whole blood
0-200
L
0.001
0-0.20
×109/L
    Differential count (number fraction)
        Neutrophils-segmented
Whole blood
56
%
0.01
0.56
Proportion of 1.0
        Neutrophils-bands
Whole blood
3
%
0.01
0.03
Proportion of 1.0
        Lymphocytes
Whole blood
34
%
0.01
0.34
Proportion of 1.0
        Monocytes
Whole blood
4
%
0.01
0.04
Proportion of 1.0
        Eosinophils
Whole blood
2.7
%
0.01
0.027
Proportion of 1.0
        Basophils
Whole blood
0.3
%
0.01
0.003
Proportion of 1.0
Zidovudine
Serum, plasma
0.15-0.27
µg/mL
3.7
0.56-1.01
µmol/L
Zinc
Serum
75-120
µg/dL
0.153
11.5-18.5
µmol/L

 


aThe laboratory values and reference ranges are provided for illustration only and are not intended to be comprehensive or definitive. Each laboratory determines its own values, and reference ranges are highly method dependent. Reference values given are for adults. For some entries for which specific molecular masses are not known (eg, proteins), reference values in SI are given as mass amounts per liter.
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) Henry JB, ed. Clinical Diagnosis and Management by Laboratory Methods. 20th ed. Philadelphia, PA: WB Saunders; 2001; (4) Kasper DL, Braunwald E, Fauci AS, et al, eds. Harrison's Principles of Internal Medicine, 16th ed. New York, NY: McGraw Hill; 2004; and (5) Goldman L, Ausiello D. Cecil Textbook of Medicine. 22nd ed. Philadelphia, PA: WB Saunders; 2004.