Abstract
In a previous publication, a method for measuring fibrin monomer in plasma with the use of an immune precipitate of fibrinogen was described. The method was found to be more sensitive to unstabilized fibrin monomer than the serial-dilution protamine sulfate test, or the ethanol gel test, and detected fibrin in a mixture of the plasmin digestion products of fibrin. In the present study the sensitivity of the immune precipitate method for detecting specific plasmin digestion products of fibrin X, Y, D, and E, its sensitivity for stabilized fibrin monomer complexes, and its sensitivity for fibrin retaining B-peptide were measured and compared with the corresponding sensitivities of the serial-dilution protamine sulfate test and the ethanol gel test for detecting these same products. The immune precipitate method was found to be highly sensitive to stabilized fibrin monomer complexes and to fibrin retaining B-peptide; to be significantly less sensitive to the plasmin digestion fragments X, Y, and E; and to be insensitive to fragment D. The serial-dilution protamine sulfate test and the ethanol gel test were found to be insensitive to all of the plasmin digestion products of fibrin and less sensitive to the other fibrin complexes.
Published Version
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