Hemagglutination inhibiton in capillary tubes—a simple and reliable test for HBsAg

Abstract
A technique is described which allows testing for HBsAg [hepatitis B surface antigen] by hemagglutination inhibition in capillary tubes. The test is rapid, and compares favorably in sensitivity to radioimmunoassay. The equipment is simple and its design eliminates the risk of [human] infection from the HBsAg reagents.