Abnormal renal tubular resorption Impaired renal tubular reabsorption of uric acid 2021-05-04T14:21:45Z Decreased renal tubular reabsorption of uric acid. Uric acid excretion rate is the product of the filtered load (which can be approximated as plasma ultrafilterable urate multiplied by tge glomerular filtration rate) and fractional excretion of urate (FEUA), which represents the percentage of filtered urate that is excreted in the final urine.