Phosphate In Urine: Results

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Results

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The phosphate urine test measures the amount of phosphate in a sample of urine collected over 24 hours (24-hour urine test). Phosphate is a charged particle (ion) that contains the mineral phosphorus.

Normal

Normal values may vary from lab to lab. Results are usually available in 1 to 2 days.

**Phosphate in urine**
Adults:	0.9–1.3 grams (g) per 24-hour urine sample	13–42 millimoles (mmol) per day
Calcium- and phosphate-restricted diet:	Less than 1.0 g per 24-hour urine sample	Less than 32 mmol per day

Many conditions can change phosphate levels. Your doctor will talk with you about any abnormal results that may be related to your symptoms and medical history.

High values

High phosphate levels may be caused by:

Kidney diseases.
An overactive parathyroid gland (hyperparathyroidism).
Not getting enough vitamin D.
Taking too much vitamin D.
Some bone diseases (such as osteomalacia).

Low values

Low urine phosphate levels may be caused by:

An underactive parathyroid gland (hypoparathyroidism).
Kidney or liver diseases.

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Last updated:	November 27, 2007
Author:	Maria G. Essig, MS, ELS
Reviewed By:	Caroline S. Rhoads, MD - Internal Medicine, David C.W. Lau, MD, PhD, FRCPC - Endocrinology & Metabolism
Editors:	Susan Van Houten, RN, BSN, MBA, Tracy Landauer

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