Approach to the hypophosphatemic patient

Area of Science:

• Biochemistry
• Nephrology
• Endocrinology

Background:

• Hypophosphatemia is a clinical condition characterized by low serum phosphate levels.
• It is frequently underdiagnosed due to nonspecific clinical manifestations.
• It is associated with significant morbidity and potential mortality.

Observation:

• Three main pathophysiological mechanisms underlie hypophosphatemia: increased renal phosphate excretion, decreased intestinal phosphate absorption, and transcellular shifts.
• Renal phosphate wasting can be further classified into fibroblast growth factor 23 (FGF23)-dependent and FGF23-independent etiologies.
• Recent advances in understanding phosphate homeostasis have stemmed from studying rare genetic disorders.

Findings:

• Accurate diagnosis necessitates a comprehensive evaluation, including medication and family history, physical examination, and assessment of renal phosphate handling.
• Identifying the specific cause of hypophosphatemia is crucial for guiding appropriate management.
• Phosphate metabolism is complex, involving intricate regulatory pathways.

Implications:

• Effective management of hypophosphatemia hinges on addressing the underlying cause.
• Close biochemical monitoring is essential during treatment.
• This review provides a framework for approaching patients with hypophosphatemia and elucidates normal phosphate metabolism.