Multicentre physiological reference values for some urinary component-to-creatinine (creatininium) concentration ratios

Abstract

Nine clinical laboratories in different regions of Spain have shared the search for reference individuals and the production of reference values for urinary component-to-creatininium concentration ratios measured in first morning urine samples using RD/Hitachi<MODULAR ANALYTICS> analysers. These urinary quantities include albumin, calcium(II), chloride, magnesium(II), phosphate, potassium ion, protein, sodium ion, urate and urea. All the logistic work was done in co-operation with the reagents' and analysers' supplier (Roche Diagnostics España, S.L., Sant Cugat del Vallès, Catalonia, Spain). From the blend of reference values obtained by each laboratory, the multicentre reference limits were estimated parametrically after mathematical transformation of original data.

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“…Age-specific reference values were based on literature [18][19][20][21][22][23][24]: upper normal values for Ca/creatinine ratio: 2.2 (patient 1), 0.8 (patient 2) and 0.7 mol/mol creatinine (patients 3-8); upper normal values for Mg/creatinine ratio: 2.2 (patient 1), 1.0 (patient 2), 0.9 (patients 3 and 4) and 0.6 mol/mol creatinine (patients 5-8); potassium/creatinine: female, 1.7-8.7; male, 1.3-8.4 mol/mol; lower normal value for s-Mg: 0.70 mmol/l; lower normal value for s-K: 3.70 mmol/l and upper normal values for calciuria/24 h and magnesiuria/ 24 h: 0.1 mmol/kg body weight per 24 h.…”