Capillary radioimmunoassay of insulin.

Capillary radioimmunoassay -- a modification of the coated tube technique -- is described. The assay is equivalent (accuracy, sensitivity, precision) to conventional methods for insulin determination; it overcomes, however, the necessity of centrifugation or filtration and offers the added bonus of being automation compatible.

Combined batchwise and continuous flow mechanization of solid-phase radioimmunoassays.

A new modification of the "coated-tube"-technique for the radioimmunoassay of human placental lactogen is described. Polyvinylchloride capillaries are used as reaction-vessels. Most working steps of the test procedure are mechanized. The possibilities and limitations of the new technique are discussed. The reliability of the method was shown by a recovery test, dilution tests, reproducibility and a comparison of the results for 71 sera, ranging from the 6th to the 42nd week of pregnancy, with those obtained by a conventional assay procedure.