Phosphate in Urine

PO4 (Phosphate), Urine, Urine PO4 (Phosphate) Test

Results

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.

Go to previous section	Go to top of page	Go to next section
Author:	Maria G. Essig, MS, ELS	Last Updated: November 27, 2007
Medical Review:	Caroline S. Rhoads, MD - Internal Medicine David C.W. Lau, MD, PhD, FRCPC - Endocrinology & Metabolism
© 1995-2008 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.This information does not replace the advice of a doctor. Healthwise disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.