
11
11
11
11----3
3
3
3
WARNING: The YSI Model 1500 is not suitable for use with
samples containing thymol or other phenol preservatives.
These are interfering substances.
Warning: Frozen blood-bank blood, which contains a high
percentage of glycerine, is not a suitable specimen for
diagnostic work with the Model 1500.
Whole Blood
Whole Blood
Whole Blood
Whole Blood
If more than five minutes will elapse between the time you draw a specimen and
analyze it, you should mix the blood with an anticoagulant during or
immediately after collection. Analysis of whole blood without an anticoagulant
is not recommended. The preferred anticoagulants are EDTA in a concentration
of 1 mg/ml of blood, or heparin sodium as commonly supplied in Vacutainer
collection tubes.
Other effective anticoagulants which may be used are potassium oxalate in a
concentration of 2 mg/ml of blood, sodium fluoride in a concentration of 5-10
mg/ml of blood, or sodium fluoride and EDTA in a concentration of 2.5mg
fluoride and 1 mg EDTA per ml of blood. These are not know to cause any error
in the measurement of whole blood lactate, but they may cause a reduction of
the sample's hematocrit value with or without accompanying hemolysis. This
would lead to a slight error in the calculated plasma lactate value. Hemolysis
can cause disagreement between readings on the Model 1500 and some
reference methods.
Cell metabolism will result in increased lactate concentrations in the specimen
through glycolysis, which will result in erroneously high assay values.
Glycolysis is particularly rapid in whole blood specimens, and these should be
analyzed within an hour of drawing. Refrigeration at +4°C will retard glycolysis
and extend the acceptable delay to four hours. Whole blood specimens must not
be frozen. Some authorities recommend the use of chemical preservatives to
minimize glycolysis:
Fluoride in concentrations of 7.5 mg/ml of blood.
Boric acid in concentrations of 8 mg/ml of blood.
Sodium iodoacetate; if sodium iodoacetate is used as the antiglycolytic, it
must be free of iodide and iodine.
YSI has not evaluated the effects of these antiglycolytics.
Summary of Contents for 1500 Sport
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