The Relation of Specific Gravity to Composition and Total Solids in Normal Human Urine 1

The Specific Gravity Adjustment in Urinalysis

“…Typical data from the literature are shown in Table 3. 4 If diet does not affect the excretion Cor absorption) of heavy metals, solvent metabolites, etc, and if the rate of excretion C corrected for body size) is a true index of absorption, the specific gravity adjustment will lead to error when applied to urine specimens from persons with varying diets, particularly with respect to protein content. Assuming a constant excretion rate of heavy metal for subject D of Table 3, the specific gravity-adjusted values would differ markedly when on the different diets, as shown in Table 4.4 A sample taken on the low-protein diet would indicate twice as severe an exposure as that obtained on the diet rich in protein.…”

Fate of the pathogen indicators phage ΦX174 and Ascaris suum eggs during the production of struvite fertilizer from source-separated urine

“…This was the case for every volume of urine and initial phage number tested. When comparing phage concentrations on a struvite mass basis, assuming a urine density of 1.02 g/cm 3 (Price et al, 1940), the values were approximately equal for urine and struvite (Fig. 1a).…”

“…The concentration in struvite is calculated based on the mass m ref . For urine a density of 1.02 g/cm 3 was used (Price et al, 1940).…”

Effect of Varying Intake of Protein and Salts on the Composition and Specific Gravity of Urine 1

“…It has been shown in a previous paper (1) that the specific gravity of urine is a simple additive function of the concentrations of the individual solutes. By the use of appropriate factors, the specific gravity " pattern," i.e., the fraction of the specific gravity accounted for by each of the constituents of the urine, may be calculated when the composition is known.…”

“…All urine specimens were collected and analyzed as described in the previous paper (1). In cases where the collection period was less than 24 hours, or where the subject was held to a controlled regime, the details are given in the discussion.…”