Albuminuria, Proteinuria, and Urinary Albumin to Protein Ratio in Chronic Kidney Disease
Journal of Clinical Laboratory Analysis,  Clinical Article

Wu MT et al. – There was a significant association between urinary albumin to creatinine ratio (UACR) and UPCR in patients with Chronic Kidney Disease. Characteristics of patients, renal function, and co–morbidities all affected urinary albumin to creatinine ratio (UACR), total protein to creatinine ratio (UPCR), and albumin to total protein ratio (UAPR) .

Methods
  • The authors conducted a cross-sectional study in 602 CKD patients.
  • Demographic data, including age, gender, and co-morbidity such as diabetes, hypertension, hyperuricemia, and hyperlipidemia, were reviewed and recorded.
  • Their urinary albumin, total protein, and creatinine were determined and urinary albumin to creatinine ratio (UACR), total protein to creatinine ratio (UPCR), and albumin to total protein ratio (UAPR) were calculated.
  • Their estimated glomerular filtration rate (eGFR) was calculated according to serum creatinine.
  • The correlation between UACR and UPCR was thus analyzed.
  • The authors also investigated factors associated with these urinary measurements.

Results
  • UACR and UPCR increased progressively as renal function deteriorated, while UAPR increased to a plateau in CKD stage 4.
  • There was direct relationship between UACR and UPCR.
  • UAPR rose exponentially with the increase of both UACR and UPCR when UACR <500 mg/g or UPCR <1,000 mg/g.
  • Multivariate regression analysis revealed diabetes and hyperuricemia were associated with increased UACR and UPCR, while both urinary parameters were inversely related to male gender and eGFR.
  • Diabetes and hyperuricemia were associated with increased UAPR and UAPR was negatively correlated with age and eGFR.

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