CRP-to-Albumin Ratio (CAR)
CRP-to-albumin ratio: C-reactive protein (mg/L) / serum albumin (g/dL); a combined inflammation / nutrition marker where higher values are less favorable.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- C-reactive protein
- 20 mg/L
- Serum albumin
- 4.0 g/dL
Result: CRP-to-albumin ratio 5 — interpretation is context-dependent.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- value
- CAR = CRP (mg/L) / albumin (g/dL). A combined inflammation / nutrition marker; higher values are less favorable. No universal cutoff — context-dependent.
What you enter
- C-reactive protein
- Serum albumin
How this is calculated
Fairclough E, Cairns E, Hamilton J, Kelly C. Evaluation of a modified early warning system for acute medical admissions and comparison with C-reactive protein/albumin ratio as a predictor of patient outcome. Clin Med (Lond). 2009;9(1):30-33. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.