Calcium-Phosphate Product (CKD-MBD)
Calcium-phosphate product (serum calcium × phosphate) for CKD-MBD context, against the historical 55 mg²/dL² caution threshold; contemporary KDIGO guidance tracks calcium and phosphate individually.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Input units
- mg/dL (US conventional)
- Serum calcium
- 9.5
- Serum phosphate
- 6.0
Result: Ca × PO₄ 57 mg²/dL² — above the historical 55 caution threshold.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Posture
- Historical caution above 55; contemporary KDIGO guidance favors tracking calcium and phosphate individually over the product.
What you enter
- Input units (mg/dL or mmol/L)
- Serum calcium
- Serum phosphate
How this is calculated
- Formula
- Ca (mg/dL) × PO₄ (mg/dL) in mg²/dL²; SI mmol/L converts first (Ca ×4.008, PO₄ ×3.097).
Kidney Disease: Improving Global Outcomes (KDIGO) CKD-MBD Work Group. KDIGO clinical practice guideline for the diagnosis, evaluation, prevention, and treatment of CKD-MBD. Kidney Int Suppl. 2009;(113):S1-130 (updated 2017). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.