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Calculates the calcium-phosphate product used in renal risk assessment for vascular calcification.
CaP = calcium * phosphate
< 55 mg²/dL²
Interpret results together with the patient's clinical presentation.
Specialty
Internal MedicineCategory
NephrologyDifficulty
Basic
Estimated Time
30 seconds
Version
1.0
Last Updated
2026-08-06
Formula
Keywords
Normal Range
< 55 mg²/dL²
| Classification | Range |
|---|---|
Acceptable | <55.1 |
Elevated — increased calcification risk | 55–70 |
Critically elevated — high calcification risk | ≥70 |
Calculates the calcium–phosphate product to assess the risk of metastatic and vascular calcification, particularly in chronic kidney disease and dialysis patients.
A product <55 mg²/dL² is acceptable. Values of 55–70 mg²/dL² are elevated with increased calcification risk, and values ≥70 mg²/dL² are critically elevated with high calcification risk.
An elevated calcium–phosphate product is associated with increased vascular calcification and cardiovascular morbidity, making it an important monitoring target in CKD-MBD management.
A 65-year-old woman on hemodialysis has serum calcium 9.5 mg/dL and phosphate 6.0 mg/dL.
Inputs:
Calcium–phosphate product = 9.5 × 6.0 = 57 mg²/dL² — elevated, indicating increased calcification risk; review phosphorus intake and phosphate binder use.
Reduce dietary phosphorus, use phosphate binders, and optimize dialysis adequacy. Avoid excessive calcium-based binders to prevent hypercalcemia.
In CKD and dialysis patients, elevated calcium and phosphate drive vascular and soft-tissue calcification, which is linked to increased cardiovascular risk.
Disclaimer: This calculator is intended for educational and clinical decision support purposes only. Manage the underlying mineral abnormalities rather than treating the number alone.