Method and system for measuring blood coagulation time

  • US 4,252,536 A
  • Filed: 11/06/1978
  • Issued: 02/24/1981
  • Est. Priority Date: 11/12/1977
  • Status: Expired due to Term
First Claim
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1. A method for measuring the end point of blood coagulation time comprising the steps ofproviding a mixture of a blood sample and a reagent,irradiating the mixture with light.detecting the amount of light scattered from the irradiated mixture and producing an electrical signal representative thereof, anddetermining from said electrical signal a first time at which the most rapid change in the electrical signal is occurring and then determining as the end point at a time prior to said first time the time at which a change which is 1/n that of the most rapid change occurred, where n is greater than 1.

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