CST3 and chronic kidney disease: The Chronic Kidney Disease Epidemiology creatinine-cystatin C (CKD-Epi_cr-cys) equation [16]: 135 × min(Scr/κ, 1)α × max(Scr/κ, 1)‒ 0.601 × min(Scys/0.8, 1)‒ 0.375 × max(Scys/0.8, 1)‒ 0.711 × 0.995age(×0.969 if female)(×1.08 if black); where Scr is serum creatinine, Scys is serum cystatin C, κ is 0.7 for females and 0.9 for males, α is -0.248 for females and -0.207 for males, min indicates the minimum of Scr/κ or 1, and max indicates the maximum of Scr/κ or 1.