]> 2026-07-31T12:14:37+00:00 WBR0980 0 en Lysine Phenylalanine The patient's presentation and findings on urinalysis are consistent with cystine stones, which often develop among patients with cystinuria. Phenylalanine reabsorption is not impaired in cystinuria, and urinary concentration of phenylalanine is not typically elevated. Tryptophan Homocysteine Leucine Biochemistry A 10-year-old girl is brought to the emergency department (ED) for severe right flank pain that developed acutely over the past 2 hours. The patient explains that her pain radiates to her groin and is only associated with nausea and one episode of yellowish vomiting. When asked, she denies any association between her pain and food intake, change in bowel movement, or change in position. Physical examination is remarkable for costovertebral angle tenderness on the right side. Urinalysis in the ED is remarkable for numerous red blood cells in addition to the presence of hexagonal crystals. Chronic elevation in the urinary concentration of which compound is associated with the development of this patient's condition? A Renal 2020-10-28T02:16:14Z 2459150.5946065 WBR0980