Percent Platelet Recovery (PPR)
Percent platelet recovery = [(post - pre) platelet count x blood volume] / platelets transfused; a transfusion response metric.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Pre-transfusion platelet count
- 10 x10^9/L
- Post-transfusion platelet count
- 40 x10^9/L
- Blood volume
- 5 L
- Platelets transfused
- 4 x10^11
Result: Percent platelet recovery 37.5% — adequate increment (>= 20%).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- >= 20%
- Adequate transfusion response.
- < 20%
- Low increment (suggests platelet refractoriness). = [(post - pre) x blood volume] / platelets transfused. A response metric, not a diagnosis.
What you enter
- Pre-transfusion platelet count
- Post-transfusion platelet count
- Blood volume
- Platelets transfused
How this is calculated
Davis KB, Slichter SJ, Corash L. Corrected count increment and percent platelet recovery as measures of posttransfusion platelet response. Transfusion. 1999;39(6):586-592. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.