Polymorphonuclear neutrophil iodination response as an estimate of defective yeast opsonization.

Polymorphonuclear neutrophil iodide uptake can be used as a measure of yeast opsonization and optimal assay conditions are described for the identification of sera defective in this function. The use of standard normal and defective sera permits correction of inter-assay variations resulting from the use of different cell donors. The iodination assay correlated well (r = 0.74, P less than 0.001) with a direct assay of yeast opsonization when both were used to measure this function in a panel of 72 sera. Differences in results between the two assay systems for some sera may be explained by a requirement for two different surface-associated opsonic molecules in the initiation of neutrophil metabolic activity.