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Comparison of the Equil2 Program and Other Methods for Estimating the Ion‐Activity Product of Urinary Calcium Oxalate: A New Simplified Method Is Proposed
Author(s) -
Ogawa Yoshihide,
Hatano Tadashi
Publication year - 1996
Publication title -
international journal of urology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 67
eISSN - 1442-2042
pISSN - 0919-8172
DOI - 10.1111/j.1442-2042.1996.tb00558.x
Subject(s) - calcium oxalate , medicine , oxalate , urinary system , urinary calcium , calcium , magnesium , urine , urology , inorganic chemistry , chemistry , organic chemistry
Background: We aimed to develop a new simplified method to determine the urinary calcium‐oxalate saturation. Methods: The ion‐activity product (AP) of urinary calcium oxalate was estimated in 345 clinical urine specimens (all 2.5 hour collections) using the Equil2 computer program and several other methods, and the results were compared. A new index using 4 parameters was created using multiple regression analysis. Results: Our new simplified method (the AP(CaOx) index EQ2) provided a better approximation to the Equil2 method ( r = 0.9897) than other conventional methods. Conclusion: This new method requiring 4 factors (urinary calcium, magnesium, oxalate, and citrate concentrations) is simple and clinically usable.