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Hypophosphatemia is a low level of phosphorus in the blood.

Causes of Hypophosphatemia

The following may cause hypophosphatemia, including:

Hypophosphatemia Symptoms

  • Bone pain
  • Confusion
  • Muscle weakness

Tests and Exams

The doctor or nurse will examine you.

The following tests may be done:

  • Kidney function tests
  • Vitamin K blood test

Exam and testing may show:

Treatment of Hypophosphatemia

Treatment depends on the cause. Phosphate can be given by mouth or through a vein (IV).

Prognosis (Outlook)

How well you do depends on what is causing the condition.

When to Contact a Health Professional

Call your health care provider if you have muscle weakness or confusion.


Yu ASL. Disorders of magnesium and phosphorous. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 121.

Review Date: 11/6/2012
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, Stephanie Slon, and Nissi Wang.
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