DOI: 10.1373/clinchem.2012.195750


A 24-year-old woman (53 kg) with a 5-year history of steroid-dependent ulcerative colitis with mild and extensive ulcerations presented to the gastroenterology clinic for symptom recurrence. She was given 100 mg/day (1.9 mg · kg−1 · day−1) azathioprine (AZA)5 for 1 month, after which the dose was increased to 125 mg/day (2.3 mg · kg−1 · day−1).