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  • Title: [Determination of the degree of saturation of calcium hydrogen phosphate in the urine].
    Author: Reusz G, Szabó A, Tulassay T.
    Journal: Orv Hetil; 1989 Mar 12; 130(11):565-8. PubMed ID: 2927936.
    Abstract:
    Calcium-hydrogen-phosphate (CaHPO4) was considered as one of the main factors governing renal calculus formation. The degree of saturation (expressed as activity product) with respect to this phase was therefore calculated in urines of 36 hypercalciuric children (20 absorptive, 16 renal subtype) with isolated hematuria, 10 renal stone patients, and 30 healthy controls. On low calcium diet 12 children of the absorptive hypercalciuric-, 13 of the renal hypercalciuric and 7 of the renal stone forming children hat their urines in the saturated zone --irrespective of the evolution of hypercalciuria Ca/cr ratio. Thiazide normalised the activity product in all groups. The use of the Ca/cr ratio as the sole parameter in the investigation of children with isolated hematuria and hypercalciuria or calcium nephrolithiasis is therefore insufficient, simultaneous determinations of the state of saturation of urines is recommended. This technique should also allow a quantitative assessment of the various therapeutic regimens recommended.
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