Metabolic
Phosphorus
LOINC 2777-1 · mg/dL
Ranges
Reference range: 2.5–4.5 mg/dL
What it is
Phosphorus is a mineral that works closely with calcium to build bones and teeth and to power energy use in cells.
Why it matters
It is read with calcium and kidney markers, as the kidneys and certain hormones keep it balanced.
What high values can mean
A higher value can relate to reduced kidney function or other conditions affecting mineral balance.
What low values can mean
A lower value can follow poor intake, certain medications or hormonal causes.
How to improve it
Phosphorus tracks kidney and mineral balance; care addresses the underlying cause rather than the number alone.
Food & lifestyle
Dairy, meat, fish, nuts and beans are rich in phosphorus; intake is rarely the issue in healthy people.
Preparing for the test
Often part of a metabolic panel; fasting is not specifically required — follow your lab.
When to talk to a doctor
Discuss an abnormal phosphorus with a doctor, often alongside calcium and kidney tests.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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