Abstract
The effect of storage on the catalytic concentration of cholinesterase and on the reference values of cholinesterase in human serum were studied. When serum was stored at room temperature (20 degrees C), at 4 degrees C and at - 20 degrees C (one year) there was no change in catalytic activity. Even after nine times freezing and thawing (over nine weeks) the catalytic activity was unaffected. The average reference value was significantly higher for males than for females (3.11 +/- 0.57 vs 2.50 +/- 0.43 kU/l).
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