copper sulfate method

cop·per sul·fate meth·od

a method for the determination of specific gravity of blood or plasma in which the blood or plasma is delivered by drops into solutions of copper sulfate graded in specific gravity by increments of 0.004, each of the bottles of solution being within the expected range of the blood or plasma sample; the specific gravity of the copper sulfate solution in which the drop of blood or plasma remains suspended indefinitely indicates the specific gravity of the sample.
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Waived procedures are limited to dipstick or tablet urinalysis (nonautomated), fecal occult blood, ovulation and urine pregnancy tests using visual color comparisons, erythrocyte sedimentation rate, hemoglobin (copper sulfate method), spun hematocrit, and blood glucose using certain devices cleared by the FDA specifically for home use.