[Determination of procollagen type III aminopropeptide by a solid phase method using antibodies conjugated with peroxidase or protein A labelled with radioactive iodine].

A solid-phase assay was developed for estimation of procollagen III aminopropeptide which involved both immunoenzymatic and radioimmune procedures. The assay did not require the iodine-labelled aminopropeptide, while content of the antigen was estimated using the conjugate of secondary antibodies and peroxidase or iodine-labelled protein A. Substitution of the protein A for the antibodies conjugate and peroxidase enabled to abolish the radioactive materials use.