Corrected Calcium: Calcium 7.5, Albumin 1.5 g/dL
With a measured calcium of 7.5 mg/dL and albumin of 1.5 g/dL, the corrected calcium is approximately 9.5 mg/dL.
How to use this tool
- Enter measured serum calcium and serum albumin in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your corrected calcium and the full breakdown beneath it.
Very low albumin significantly underestimates true calcium; a reading of 7.5 with albumin 1.5 corrects to about 9.5 mg/dL.
Frequently asked questions
- When do I need a corrected calcium?
- Whenever serum albumin is outside the normal range (roughly 3.5–5.0 g/dL). In patients with malnutrition, liver disease, or nephrotic syndrome albumin is often low, making total calcium misleadingly low.
- What is the normal serum calcium range?
- Most labs use 8.5–10.2 mg/dL (2.12–2.55 mmol/L) as the adult normal range, though ranges vary slightly between laboratories.
- Is this formula always accurate?
- The Payne/correction formula has known limitations and can over- or under-correct. Ionised calcium measurement avoids the need for correction entirely and is preferred when accuracy is critical.