Poly-HRP is an enhanced enzymatic label comprising covalent HRP homopolymer. Proprietary synthesis process has been developed to produce HRP homopolymers of different size. Three standartized intermediates are currently made. These are Poly-HRP20, Poly-HRP40 and Poly-HRP80 named according to the average polymerization range characteristic of each item. Poly-HRP is stable in aqueous solutions and has a loose linear-branched structure which maintains 100% activity of the composite enzyme. In the capacity of enhanced label Poly-HRP can be covalently coupled to virtually any anti-analyte. .