Michael H Rausch

US Patent:

51569744, Oct 20, 1992

Filed:

May 27, 1988

Appl. No.:

7/199551

Inventors:

Hyman Grossman - Lambertville NJ
Michael Rausch - Warrington PA

Assignee:

Biodata Corporation - Hatboro PA

International Classification:

G01N 3386

US Classification:

436 69

Abstract:

A method for determining the fibrinogen level of a patient blood plasma in an optical density based prothrombin time test. The method and apparatus utilize a novel parameter DELTA which factors out statistical inaccuracies associated with prior art test methods. The patient fibrinogen level is determined using DELTA points calculated from blood samples having known fibrinogen levels in the low, normal and high ranges. A piece wise function is then constructed around the DELTA points and the fibrinogen level of a patient blood sample is calculated using four equations pre-stored in a non-volatile memory.