Control or calibration standard for use with instruments for optical measurement of hemoglobin concentration in blood samples
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United States of America Patent
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Jan 16, 2001
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app pub date -
Apr 3, 1998
filing date -
Apr 3, 1998
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Abstract
A control or calibration standard for use with instruments for the optical measurement of the hemoglobin content in blood samples, features scattering particles or beads dispersed in aqueous electrolyte solution. To prevent sedimentation of the beads during storage, they have a mean diameter of <0.6 .mu.m, preferably about 0.3 .mu.m, and a volume concentration of <1%, preferably <0.3%. To prevent long term agglomeration, a non-ionic surfactant with an added antioxidant can be included in the formulation.
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