title: An evaluation of test sticks used for the measurement of the specific gravity of urine from patients with stone disease.
abstract: A test stick for the measurement of the SG of the urine of stoneformers was examined. In 230 spontaneously voided urines and 45 25 h-urines the SG was measured by the test stick and compared with urinometer measurements. The two methods showed a good correlation (r = 0.86). Due to the principle of reaction of the SG-teststick a direct relationship of the SG-values to the sodium concentration and to the ionic strength of urine was found. There is no correlation between the relative supersaturation of CaOx and the SG-determination (urinometer, test stick). The handling of the SG-test stick is simple and can be easily performed by the patient.
mesh_terms: D002118:Calcium / Q000652:urine; D006801:Humans; D008274:Magnesium / Q000652:urine; D010070:Oxalates / Q000652:urine; D010710:Phosphates / Q000652:urine; D012964:Sodium / Q000652:urine; D013046:Specific Gravity; D014545:Urinary Calculi / Q000652:urine*
chemical_list: D010070:Oxalates; D010710:Phosphates; D012964:Sodium; D008274:Magnesium; D002118:Calcium