Abstract
An antiserum to follicle stimulating hormone (FSH) obtained as a gift from National Institute of Health (NIH), U.S.A. could not be adsorbed on microtitre ELISA plates, although two other FSH antisera raised in authors' laboratory could be adsorbed. A good precision profile for the FSH assay using these three antisera could be achieved with only one separation system viz. solid phase anti rabbit gamma globulin (ARGG), out of the five separation systems tried. The study suggests that a few antisera used for radio-immunoassay (RIA) purposes may not by themselves get adsorbed on plastic plates. However, they could be effectively used for ELISA purposes using solid phase second antibody.
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