The normal values for kidney function tests may vary depending on the hospital and region, as well as the differences between men and women. First, for normal values of blood creatinine, the normal range for women is about 44-84 μmol/L, while for men it is between 62-106 μmol/L. Because men have a higher metabolic rate than women, men produce more blood creatinine metabolically than women. Secondly, the normal range of urea nitrogen is about 2.1-8.2 mmol/L, and the normal range of uric acid is between 140-340 μmol/L in women and about 200-420 μmol/L in men. Thirdly, the normal glomerular filtration rate is between 80-120 ml/min/1.73m2.