Relationship between psoriasis and urolithiasis.

The aim of the present study was to investigate whether patients with psoriasis are prone to urolithiasis. Prospective analysis of 67 patients diagnosed as psoriasis (PS group) and 65 volunteers who had never been diagnosed as psoriasis (NPS group) was performed. The levels of oxalate, citrate, calcium, uric acid, magnesium, creatinine, and sodium were evaluated by analyzing the 24-h urine samples. Stone events were detected in 13 patients (19.4%) in the PS group and in five participants (7.7%) in the NPS group, respectively (P < 0.05). The median value of 24-h citrate was significantly lower in the PS group than in the NPS group (P = 0.029). The median value of 24-h urine uric acid was significantly higher in the PS group than the NPS group (P = 0.005). Hypernatriuria was significantly higher in the PS group (P = 0.027). Hyperuricosuria was detected in the 10.4% and 1.5% of patients who had severe and mild disease, respectively (P = 0.027). Patients with psoriasis are more prone to urolithiasis. Hypocitraturia, hyperuricosuria, and hypernatriuria were the main metabolic abnormalities detected in psoriasis. Hyperuricosuria has been associated with the severity of the disease.