Calcium × Phosphorus Product Calculator
Calculate the Calcium × Phosphorus (Ca × P) Product using serum calcium and phosphorus levels. This calculator is useful in assessing calcium-phosphorus balance, particularly in patients with chronic kidney disease (CKD).
Calculation Result
Formula
Ca × P Product = Total Calcium (mg/dL) × Phosphorus (mg/dL)
Unit: mg2/dL2
Interpretation
| Ca × P Product | Interpretation |
|---|---|
| <55 mg2/dL2 | Generally acceptable. Interpret together with the patient's clinical condition and laboratory findings. |
| ≥55 mg2/dL2 | Elevated value that may be associated with increased calcification risk, particularly in chronic kidney disease. |
Clinical Use
The Calcium × Phosphorus Product is calculated by multiplying serum calcium by serum phosphorus. It may be used as part of the assessment of calcium-phosphorus balance, particularly in patients with chronic kidney disease.
The result should be interpreted together with serum calcium, phosphorus, PTH, vitamin D status, kidney function, and the patient's overall clinical condition.
Frequently Asked Questions
What is the Calcium × Phosphorus Product?
The Calcium × Phosphorus Product is the product obtained by multiplying the serum calcium concentration by the serum phosphorus concentration.
How is the Calcium × Phosphorus Product calculated?
Multiply total serum calcium in mg/dL by serum phosphorus in mg/dL.
What does a high Calcium × Phosphorus Product mean?
An elevated Calcium × Phosphorus Product may indicate an increased calcium-phosphorus burden and may be associated with calcification risk, particularly in patients with chronic kidney disease.
Can this calculator diagnose disease?
No. This calculator is a laboratory and clinical support tool. The result should be interpreted together with clinical findings and other laboratory investigations.
Clinical Applications
- Chronic Kidney Disease (CKD)
- CKD-Mineral and Bone Disorder (CKD-MBD)
- Dialysis patient assessment
- Calcium-phosphorus balance assessment
- Laboratory interpretation
Disclaimer
This calculator is intended for educational and laboratory reference purposes only. It should not replace professional medical advice, diagnosis, or treatment. Clinical decisions should be based on the complete clinical picture and applicable clinical guidelines.
References
- KDIGO Clinical Practice Guideline for Chronic Kidney Disease – Mineral and Bone Disorder.
- KDOQI Clinical Practice Guidelines.
- Tietz Fundamentals of Clinical Chemistry and Molecular Diagnostics.
