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Liu
Shan
THE MANY ASPECTS
OF
TAKING FASTING BLOOD
SAMPLES
Food
and drink
may
affect certain
blood tests considerably. After a fatty
meal,
the blood stream is
loaded with
fat and
triglyceride
levels may
be
10
times
that of
normal;a
high
protein meal
would
also
raise protein metabolites
in
the blood, e.9., urea or uric acid, giving
a
false impression of impaired
kidney
function; carbohydrates taken before
blood
taking would also raise
blood
sugar and diabetes may be misdiag-
nosed;
a
rich breaklast would lead to
a
raised
alkaline
phosphatase
levels
giving a false impression
of
disturbed
liver
function.
On
the night before blood
taking, avoid taking tea, coffee or coke
- all these contain
caffeine
that
may
stimulate
the
adrenals
to
secrete
steroid hormones so that
the
blood
sugar and free fatty acids levels would
be
affected.
lt
is
worthwhile
to
take note
of
the instructions given before blood
is
taken.
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