Renal function and water balance

Routine urinalyses, including microscopic examination, were performed periodically.
Protein, sugar, and pH were determined using Hema-Combistix reagent strips manufactured by the Ames Company. When the presence of albumin was suspected from a
doubtful reaction of the reagent strip, the sulfasalicylic acid turbidity test for protein
was also done. Likewise, to rule out a false positive reaction for glucose, the
presence or absence of the latter was also determined using Clinitest Reagent
Tablets (Ames). Specific gravity was determined using an urinometer, and acetate
with Acetest Tablets (Ames Company). Serum and urinary creatinine clearance were
determined once every three days. Methods used in all of the above tests were taken
from standard Navy laboratory manuals published by the U. S. Naval Medical School,
National Naval Medical Center, Bethesda, Md.