Method and apparatus for ratiometric measurement of hematocrit

Details Method and apparatus for ratiometric measurement of hematocrit Method and apparatus for ratiometric measurement of hematocrit

1996-05-17

1999-02-09

Brown, Glenn W.

Electricity: measuring and testing

Electrolyte properties

Using a conductivity determining device

324692, 324 711, G01N 2706

Patent

active

058699716

ABSTRACT:
A method and apparatus for measuring resistance of a blood sample in order to determine the hematocrit of that blood sample. The present invention makes a direct ratiometric measurement. That is, the alternating current that flows through the sample is directly measured by applying that alternating current to an integrator which converts the current to a D.C. voltage which is directly proportional to the applied current.

REFERENCES:
patent: 3772591 (1973-11-01), Louder et al.
patent: 3812425 (1974-05-01), Miller
patent: 3922598 (1975-11-01), Steuer et al.
patent: 4068169 (1978-01-01), Angel et al.
Teyssedou et al., "Impedance probe to measure local void fraction profiles", Review of Scientific Instruments 59 (1988) Apr., No. 4, NY USA, pp. 631-638.

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