The aim of this study is to evaluate whether a new test using mannitol infusion can diagnose the cause of polyuria-polydipsia syndrome as accurately as the current standard test (hypertonic saline infusion) and to compare which test patients prefer. The goal is to identify a simpler and more patient-friendly diagnostic approach.
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Overall Diagnostic Accuracy
Timeframe: One time assessment at Follow up Visit 2 (10 weeks after baseline)
Patient Test Preference
Timeframe: 1 week after completion of both diagnostic tests