| Sumario: | Polyuria-polydipsia syndromes are rare disorders characterized by hypotonic polyuria and polydipsia. They may result from complete or partial arginine vasopressin deficiency or resistance or may take the secondary form of primary polydipsia. Traditional diagnostic tests have limitations, making differentiation from other polyuric disorders challenging. New assays and updated algorithms have enhanced diagnostic accuracy and efficiency. This article reviews the pathophysiology, diagnostic challenges, and latest advancements associated with polyuria-polydipsia syndromes. As patients' conditions become more complex, staying up to date with evolving diagnostic algorithms is essential to safe, high-quality, and evidence-supported care.
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