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Method for determining cause of the prolongation of blood coagulation time

Provided is a method of accurately and easily determining a cause of the prolongation of blood coagulation time.
The method of determining a cause of the prolongation of blood coagulation time in test plasma includes (1) measuring the blood coagulation time of samples including (a) the test plasma only, (b) normal plasma only, and (c) the test plasma and the normal plasma mixed at least at a mixing ratio, (2) drawing a polygonal line graph by plotting the measurement results of the samples (a), (b) and (c), with the vertical axis representing the blood coagulation time or the prolongation ratio of blood coagulation time and the horizontal axis representing the mixing ratio or mixing proportion of the test plasma or the normal plasma, and thereby determining the area A under the polygonal line and the area B under a line segment that connects the plotted measurement results of the samples (a) and (b), (3) calculating the ratio of the area (A−B) obtained by subtracting the area B from the area A, with respect to the area B, ((A−B)/(B)):area ratio X), (4) performing the steps of (1) and (2) for a coagulation factor inhibitor-positive plasma, and thereby determining in advance a standard area ratio Y, and (5) comparing the area ratio X and the standard area ratio Y, and determining the test plasma as a coagulation factor inhibitor type in the case where Y≦X, or as a coagulation factor deficient type in the case where Y>X.
Owner:SEKISUI MEDICAL CO LTD
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