Hematocrit measurements by electrical conductivity

Details Hematocrit measurements by electrical conductivity Hematocrit measurements by electrical conductivity

1976-08-24

1979-05-22

Tokar, M.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 30R, G01N 2742

Patent

active

RE0300071

ABSTRACT:
Method and apparatus for determining the hematocrit of blood samples from the electrical conductance of whole blood by means of a portable, simple to use instrument with a digital readout. A dip-electrode-probe and/or a "fingerstick"-probe, requiring one drop of blood, have been developed to provide an easy to use and clean electrode system. Electronic improvements further provide for uniformity of readings between observers, automatic operator alert when poor sample contact or insufficient battery power, an exponential solution to the Fricke, Curtis and Maxwell equations and further eliminates electrode polarization by providing a separate DC path to conduct any DC component in the sine-wave signal. A provision is also made to estimate the hemoglobin value from the measured hematocrit.

REFERENCES:
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patent: 2082213 (1937-06-01), O'Donnell
patent: 2215213 (1940-09-01), Ellis
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patent: 3115602 (1963-12-01), Sutton et al.
patent: 3512080 (1970-05-01), Hanson
patent: 3593119 (1971-07-01), Brum
patent: 3710778 (1973-01-01), Cornelius
patent: 3772591 (1973-11-01), Louder

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