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Rapidlab 800 Operator's Manual
The following limitations apply to the 850 and 860 systems:
S Avoid hemolyzed samples, because they falsely elevate potassium levels due to
intra-erythrocyte potassium levels.
S Avoid samples with elevated levels of salicylates, salicylate derivatives such as
ibuprofen, and bromide (Br
–
), because they falsely elevate chloride levels.
S Avoid samples contaminated with perchlorate (ClO
4
–
), thiocyanate (SCN
–
),
iodide (I
–
), and nitrate (NO
3
–
), because they falsely elevate chloride levels.
S Avoid using excessive levels of heparin anticoagulants. Excessive levels of
heparin anticoagulants cause calcium-heparin chelation and falsely decrease
calcium levels.
The following limitations apply only to the 860 system:
S Avoid using sample collection devices containing fluoride/oxalate anticoagulants
(the gray top tube). These anticoagulants have a significant effect on glucose and
lactate.
Sample Sources
The 800 system can analyze samples obtained from the following sources:
Sample Source Description
arterial blood Arterial blood is commonly recommended for use in blood gas
studies because it accurately reflects acid-base physiology and
oxygenation status.
Arterial blood is routinely obtained from the radial, femoral, or
brachial arteries. Other sites can be used following catheterization or
surgical procedure
s.
venous blood Venous blood can provide satisfactory pH and pCO
2
values;
however, venous pO
2
values may not be significant in routine
clinical study without simultaneous study of arterial pO
2
.
Venous blood is routinely obtained from an antecubital vein using
vacuum tube collection systems. Other sites can be used as necessary.
Venous oxygen saturation values reported must be so labeled to
ensure correct interpretation of the results.
mixed venous
blood
Mixed venous (pulmonary artery) blood may be obtained from a
pulmonary artery catheter after carefully clearing the catheter of
infusion fluid. Take appropriate precautions to prevent mixing of
pulmonary capillary blood with the pulmonary artery blood.
(Continued)
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