Phosphorus (Urine)
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.
Frequently asked questions
- What is a normal Phosphorus (Urine) level?
- A typical reference range for Phosphorus (Urine) is 400–1300 mg/24hr (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Phosphorus (Urine) measured in?
- Phosphorus (Urine) is most commonly reported in mg/24hr. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Phosphorus (Urine) reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Phosphorus (Urine) over time?
- Yes. Upload results from any lab and BloodId charts your Phosphorus (Urine) over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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