What is the phosphate concentration of 2.67 mmol/L expressed in mg/dL?

Phosphate Conversion: 2.67 mmol/L = 8.26 mg/dL

A phosphate concentration of 2.67 mmol/L equals 8.26 mg/dL.

Conversion Calculation

The conversion between mmol/L and mg/dL for phosphate uses the following formula:

• mg/dL = mmol/L × 3.1 (using the molecular weight of phosphorus: 31 g/mol)

Therefore: 2.67 mmol/L × 3.1 = 8.26 mg/dL

Clinical Context

This phosphate level of 8.26 mg/dL represents severe hyperphosphatemia in any clinical context 1:

• Normal range: 2.5-4.5 mg/dL (0.81-1.45 mmol/L) in general population
• CKD Stage 5/Dialysis target: 3.5-5.5 mg/dL (1.13-1.78 mmol/L) 1
• Your value of 8.26 mg/dL is approximately 1.8-3.3 times the upper limit of normal

Standard Conversion Factors for Phosphate

Multiple guidelines confirm the conversion relationship 1:

• 1 mmol/L = 3.1 mg/dL
• 1 mg/dL = 0.32 mmol/L

For reference, the evidence shows consistent use of these conversions across clinical contexts:

• 2.5 mg/dL = 0.81 mmol/L 1
• 4.5 mg/dL = 1.45 mmol/L 1
• 5.5 mg/dL = 1.78 mmol/L 1

Clinical Significance: A phosphate level this elevated (8.26 mg/dL) would require immediate intervention in any patient population, particularly those with chronic kidney disease where it significantly increases mortality risk 2, 3.