The urine phosphorus test measures the amount of phosphorus excreted in urine over 24 hours. It helps evaluate phosphorus metabolism, parathyroid function, and kidney stone risk.
Category: Urinalysis
Also known as: urine phosphorus, phosphorus urine, urinary phosphorus, urine phosphate, 24h urine phosphorus
Reference range: 400–1300 mg/24hr (Source: ABIM)
Standard unit: mg/24hr
High values may indicate
High urine phosphorus may indicate hyperparathyroidism, vitamin D excess, kidney tubular defects, or a high-phosphorus diet.
Low values may indicate
Low urine phosphorus may indicate hypoparathyroidism, vitamin D deficiency, or malabsorption syndromes.