Blood Test Clinical Significance Chart Page 17
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28PHOSPHOROUS
Why get tested?
4.0-7.0 mg/dL
To evaluate the level of
phosphorus in your blood
and to aid in the diagnosis
of conditions known to
cause abnormally high or
low levels
When to get tested?
As a follow-up to an
abnormal
calcium
level, if
you have a
kidney disorder
or uncontrolled diabetes,
and if you are taking
calcium or phosphate
supplements
POTASSIUM
3.6-5.0 mmol/L
Why get tested?
To diagnose levels of
potassium that are too high
(hyperkalemia) or too low
(hypokalemia)
When to get tested?
As part of a routine medical
exam or to investigate a
serious illness, such as high
blood pressure or
kidney
disease
PROSTATIC SPECIFIC ANTIGEN
Why get tested?
0.00-4.00 ng/mL
(PSA)
To get screened for -- and
to monitor --
prostate
cancer
When to get tested?
There is some debate over
this (see
prostate cancer
screening). Generally, for
men over 50, as
recommended by your
physician (may be annually
or less frequently); annually
starting at age 45 for
African-American men and
men with a family history
of prostate cancer.
RHEUMATOID FACTOR
Why get tested?
IU/mL
To help diagnose
Negative
<20
rheumatoid arthritis (RA)
Weak Positive 20-50
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