Stability of Cholinesterase in Frozen Plasma

[摘要] Specimens of plasma from 51 agricultural workers were divided into several portions for freezing and storage. Periodic assays (in duplicate) for cholinesterase activity in each specimen were compared with the initial values obtained on each fresh, unfrozen specimen.Freezing and/or thawing results in loss of approximately 30% of the plasma cholinesterase activity. It is not possible to use divided frozen portions of an initial specimen of plasma as controls for repeated testing of a subject.

[学科分类] 过敏症与临床免疫学