Correction of blood count tube readings

Details Correction of blood count tube readings Correction of blood count tube readings

1989-01-30

1990-08-28

McGraw, Vincent P.

Optics: measuring and testing

Blood analysis

73 611R, 128771, 356384, G01B 1108, G01B 1112, B01D 2126

Patent

active

049520547

ABSTRACT:
The method of correcting readings of cell counts in a centrifuged blood sample contained in a transparent tube which also contains a transparent cylindrical float. Light absorption measurements are made at different locations in the tube. A beam of light is directed through the tube and the float and a light absorption reading is taken. A light beam is also directed through the sample above the float and another absorption reading is taken. The ratio of the two readings is determined and compared to a target ratio that is precalculated from an ideal tube and float. Any deviations from the target ratio are proportional to correction factors which are applied to the cell readings taken. A colorant is added to the sample to impart the light absorption capability thereto.

REFERENCES:
patent: 4774965 (1988-10-01), Rodriguez et al.

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