Determination of Specific Gravity of Urine

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Abstract
Goldman (Pediatrics, 24:814, 1959) pointed out that determination of the specific gravity of urine of pediatric patients by use of a urinometer was often difficult to perform because a minimum sample of 25 ml was required. It should also be noted that the ordinary urinometer is a relatively inaccurate instrument. Moreover, the test as ordinarily done does not take into consideration additional error resulting from variation in the temperature of the urine. Goldman suggested that the determination of specific gravity of urine by means of the copper sulfate method was suitable for clinical use in pediatrics. The method suggested requires replacement of solutions every 2 weeks and some skill in performance of the test.

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