Comparison of the sensitivity and specificity of serum creatinine with serum cystatin C on assesement of renal functions in men respectively as follows: the sensitivity was 81.9% compared to 94.1% and the specificity of 79.6% compared to 93.5%, and in female group, the sensitivity is 76.6% compared to 92.6% and the specificity was 89.6% compared to 92.3%.