IMPORTANT NOTES
NORMAL LABORATORY VALUES
TERMINOLOGY
Each commercial laboratory has its own set of “normal” values, called “Normal Range” or “Reference Range” on your lab report. These values depend on the equipment or method used. Compare your results to the range shown on your lab report. Results that are “out of range” may not represent a problem. Your test results can be affected by several factors, including your age or gender, if you are pregnant, the time of day when the sample was taken, active infections, stage of HIV disease, and food (some test samples need to be taken after you have fasted  not eaten anything  for several hours). Where normal values for men and women are different, they are indicated as W for women and M for men. Discuss “out of range” results with your health care provider.
The table below compares the units used in the United States with the "Système International d'Unités (SI units), a metric system used in many parts of the world. The last column, "To Convert US to SI Units," is the factor to multiply US lab values to convert them to SI units. To convert SI units to US units, divide the SI value by the conversion factor. See page 2 for a terminology list.
Laboratory Test  Normal Range in US Units  Normal Range in SI Units  To Convert US to SI Units 
ALT (Alanine aminotransferase)  W 730 units/liter M 1055 units/liter 
W 0.120.50 µkat/liter M 0.170.92 µkat/liter 
x 0.01667 
Albumin  3.1  4.3 g/dl  31  43 g/liter  x 10 
Alkaline Phosphatase  W 30100 units/liter M 45115 units/liter 
W 0.51.67 µkat/liter W 0.751.92 µkat/liter 
x 0.01667 
Amylase (serum)  53123 units/liter  0.882.05 nkat/liter  x 0.01667 
AST (Aspartate aminotransferase)  W 925 units/liter M 1040 units/liter 
W 0.150.42 µkat/liter M 0.170.67 µkat/liter 
x 0.01667 
Basophils  03% of lymphocytes  0.00.3 fraction of white blood cells  x 0.01 
Bilirubin  Direct  0.00.4 mg/dl  07 µmol/liter  x 17.1 
Bilirubin  Total  0.01.0 mg/dl  017 µmol/liter  x 17.1 
Blood pressure  Normal: 120/70 to 120/80 millimeters of mercury (mmHg). The top number is systolic pressure, when the heart is pumping. Bottom number is diastolic pressure then the heart is at rest. Blood pressure can be too low (hypotension) or too high (hypertension).  No conversion  
C peptide  0.52.0 ng/ml  0.170.66 nmol/liter  x 0.33 
Calcium, serum  8.5 10.5 mg/dl  2.12.6 mmol/liter  x 0.25 
Calcium, urine  0300 mg/24h  0.07.5 mmol/24h  x 0.025 
Cholesterol, total 

x 0.01129  
Urea, plasma (BUN)  825 mg/dl  2.98.9 mmol/liter  x 0.357 
Urinalysis: pH Specific gravity 
5.09.0 1.0011.035 
5.09.0 1.0011.035 
No conversion 
WBC (White blood cells, leucocytes)  4.511.0x10^{3}/mm3  4.511.0x10^{9}/liter  No conversion 
UNITS:
gram: common measurement of weight. Used in this table: pg (picograms), g (grams), mg (milligrams), etc. per liter
katal (kat): a unit of catalytic activity, used especially in the chemistry of enzymes. Used in this table: µkat (microkatals), nkat (nanokatals) per liter
micrometer (µm): a unit of length. Mean Corpuscular Volume is expressed in cubic micrometers
mole: also “gram molecular weight,” a quantity based on the atomic weight of the substance. Many test results in the Système Internationale are expressed as the number of moles per liter. In US units, these measurements are usually in grams per liter. Used in this table: mmol (millimoles), µmol, (micromoles), nmol (nanomoles), pmol (picomoles) per liter
Some units of measurement include the following fractions and multipliers:
mega (M): 106 or x1,000,000 
milli (m): 103 or ÷1,000 
kilo (k): 103 or x1,000 
micro (µ): 106 or ÷1,000,000 
deca or deka: 101 or x10 
nano (n): 109 or ÷1,000,000,000 
deci (d): 101 or ÷10 
pico (p): 1012 or ÷1,000,000,000,000 