Measurement of the risk of calcium phosphate crystallization in urine
- 1 March 1987
- journal article
- research article
- Published by Springer Nature in Urological Research
- Vol. 15 (2) , 79-81
- https://doi.org/10.1007/bf00260937
Abstract
A method is described for analysis of the risk of calcium phosphate (CaP) crystallization in urine samples. The pH required for formation of 500 crystals in the size range 3.5 to 5 μm (pHCaP) was determined in a Coulter Counter following addition of sodium hydroxide. The risk of CaP crystallization (CaP-CR) was defined as: 1/(pHCaP−5.8). CaP-CR was determined in 24 h urine collections from 25 patients with calcium stone disease and 26 normal subjects, each urine diluted to a creatinine concentration of 5 μmol per ml. The mean (±SD) CaP-CR was 0.71±0.18 and 0.63±0.14 respectively and did not differ significantly. This method might be useful for evaluations and follow-up of stone formers with respect to the risk of CaP precipitation and stone formation.This publication has 6 references indexed in Scilit:
- Measurement of the risk of calcium oxalate crystallization in urineUrological Research, 1985
- A Simplified Estimate of the Ion-Activity Product of Calcium Phosphate in UrineEuropean Urology, 1984
- A simple technique for assessing the propensity for crystallization of calcium oxalate and brushite in urine from the increment in oxalate or calcium necessary to elicit precipitationMetabolism, 1983
- Biochemical Evaluation of Patients with UrolithiasisEuropean Urology, 1981
- Inhibitors and promoters of stone formationKidney International, 1978
- A Biochemical Basis for Grouping of Patients with UrolithiasisEuropean Urology, 1978