For acting calcium and phosphorus tests, 10 ml of HCL 6 normal was added examination University 24 hour urine box, exam inhibit University precipitation of calcium and phosphorus salts. For each urine specimen, University parameters of calcium, phosphorus, urea, creatinine, uric acid, microalbumin and protein were measured using University autoanalyzer BIOLIS 24i Premium, and totally 21 tests were conducted for each patient. Urea was measured with urease/glutamate dehydrogenase method with sensitivity rate of 2 mg/dl, uric acid with enzymatic, colorimetric Toos method with sensitivity rate of 0. 3 mg/dl, and microalbumin with immunoturbidometric method with sensitivity rate of 3 mg/l using Pars Azmoon kits Iran. Creatinine was measured with University Jaffe, kinetic colorimetric method with sensitivity rate of 0. 3 mg/dl, calcium with University arsenazo method with sensitivity rate of 0. The definition of false positives is quizzes bad sample, which at first scores effective, but that is negative after retesting with University same test. I would say University second sentence is accurate, but not University first sentence. in the beginning constructive but then trying out negative poor after retesting is individually quizzes case of imprecision random error of University test near University limit of detection, not quizzes false beneficial. Check out Hedderich, M Sachs L, Angewandte Statistik 17th edition, phase 4. 5 p 186 Der diagnostische Test, Table 4. 6.