Estimated Glomerular Filtration Rate Using Cystatin C is a More Sensitive Marker for Kidney Dysfunction in Nonweight-bearing Individuals.

Estimated glomerular filtration rate equations containing serum creatinine, cystatin C, or both, validated in mostly ambulatory populations, are not equivalently accurate in estimating kidney function in nonweight-bearing individuals. Comparison of these equations against gold standard glomerular filtration rate measurement is needed to determine which most closely approximates true glomerular filtration rate.