My almost three year old son had fetal hydronephrosis, was followed by a pediatric nephrologist until one year of age, and he has always had excessive thirst. He currently drinks approximately 48-60 ounces of fluid per day, including waking up at night twice for juice or water. He usually drinks an eight ounce cup at a time, all at once (what college students refer to as “chugging”). Am I correct in being concerned about diabetes insipidus? If so, what tests should I request from his pediatrician, who is likely to downplay my concerns?

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