The Effect of Storage at Different Temperatures on Cholinesterase Activity in Human Serum

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.degree. C), at 4.degree. C and at -20.degree. C (1 yr) there was no change in catalytic activity. Even after 9 times freezing and thawing (over 9 wk) the catalytic activity was unaffected. The average reference value was significantly higher for males than for females (3.11 .+-. 0.57 vs. 250 .+-. 0.43 kU/l).

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