... was determined by spectrophotometry, while creatinine clearance, serum creatinine,urea and uric acid levels were determined using AMS Autolab analyzer.Results: Urinary aminolevulinic acid levels ... rangesaccording to the manufacturer of the kit were: serum cre-atinine (male, 7–13 μg/ml and female, 6–11 μg/ml); cre-atinine clearance (male, 94–140 ml/min and female, 72–110 ml/min); and blood ... blank for tubes C andD. All tubes were heated in a boiling water bath for 10 minand allowed to cool in cold water. The glass stoppers werethen removed and centrifuged (1000 g ×) for 1 min...