Method and apparatus for determining the erythrocyte sedimentati

Details Method and apparatus for determining the erythrocyte sedimentati Method and apparatus for determining the erythrocyte sedimentati

1996-06-26

1998-04-28

Rosenberger, Richard A.

Optics: measuring and testing

Blood analysis

436 70, G01N 1505, G01N 3349

Patent

active

057452270

ABSTRACT:
In an improved method for measuring the erythrocyte sedimentation rate (ESR) a pre-evacuated test tube (T) is used to collect a blood specimen. The tube (T) is made of a material such as glass or plastics and contains an anticoagulant/mixing agent. For testing, the tube (T) is put into a rack (1) and loaded into an instrument which mixes the specimen briefly. An optical sensor (3) is used to record the location of the blood/air meniscus at initial time. At subsequent time intervals thereafter for periods up to 20 minutes or less, the optical sensor (3) identifies and measures the location of the cell/plasma interface (I) within an observation window constituting a minor portion of the overall length of the tube (T). The measured value is then converted by an algorithm (10, 11) to the value which would be obtained using the classical Westergren method.

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patent: 4848900 (1989-07-01), Kuo et al.
patent: 5003488 (1991-03-01), Hardy
patent: 5594164 (1997-01-01), Bull

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