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Clinical Chemistry 34: 2249-2252, 1988;
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Clinical Chemistry, Vol 34, 2249-2252, Copyright © 1988 by American Association for Clinical Chemistry

A longitudinal study of cholinesterase changes in pregnancy

RT Evans, J O'Callaghan and A Norman
Department of Chemical Pathology, St. James's University Hospital, Leeds, U.K.

Serum cholinesterase activity was measured at intervals before, during, and after 44 pregnancies in 43 women. Three patterns of change were seen: (a) A decline in activity after conception, with no return towards pre-conception values before delivery (20 pregnancies). (b) A decline in activity accompanied by a partial or complete return to pre- conception values before delivery (19 pregnancies). (c) Either no discernible decline or increased activity during gestation (five pregnancies). We saw no association between these patterns and either the sex of the child, parity, smoking history, or alcohol intake. However, the continuous decrease in cholinesterase activity occurred in the youngest group of women, a decrease followed by an increase in the intermediate age group, and no decrease at all in the oldest group. Although not all the age-related differences quite reached statistical significance, these findings suggest that the patterns of change may be determined by some aspect of maternal physical maturity.




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