Phosphate (PHOS) | LabsVault

What is Phosphate?

Phosphate is an essential mineral that plays crucial roles in bone formation, energy metabolism, and cellular function. About 85% of the body’s phosphate is stored in bones and teeth, while the remainder circulates in blood and soft tissues. It works closely with calcium to maintain bone health and is vital for ATP production and DNA synthesis.

Why is it Tested?

Doctors order phosphate to evaluate bone disorders, kidney function, and metabolic conditions. It’s essential for diagnosing and monitoring conditions affecting calcium-phosphate balance, such as hyperparathyroidism, vitamin D deficiency, and chronic kidney disease. Phosphate levels help guide treatment for bone and mineral disorders.

Normal Ranges

Reference ranges vary by lab and age. General adult guidelines:

Adults: 2.5–4.5 mg/dL

Reference ranges vary by authority. Track yours across multiple standards with automatic unit conversions in LabsVault.

What do Abnormal Results Mean?

Abnormal results are not a diagnosis. Always discuss your results with a qualified healthcare provider before making any medical decisions.

Low Phosphate

Low phosphate levels (hypophosphatemia) may indicate:

Vitamin D deficiency
Hyperparathyroidism
Malnutrition or malabsorption
Chronic antacid use or phosphate binders

High Phosphate

Elevated phosphate levels (hyperphosphatemia) can result from:

Chronic kidney disease
Hypoparathyroidism
Excessive vitamin D intake
Tumor lysis syndrome

How to Track Over Time

Phosphate tracking alongside calcium and vitamin D levels provides insight into bone and mineral metabolism. Gradual changes may indicate developing kidney disease or bone disorders, while acute fluctuations often reflect dietary changes or medication effects. Regular monitoring helps optimize bone health and prevent complications.