French TTP score (ADAMTS13 probability)
French TTP score (Coppo 2010): 0-3 pretest rule for severe acquired ADAMTS13 deficiency — platelet < 30, creatinine ≤ 2.26 mg/dL, positive ANA; 0 very unlikely, 2-3 highly likely.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Platelet count
- 22 ×10⁹/L
- Creatinine
- 1.1 mg/dL
- Antinuclear antibody (ANA) positive
- No
Result: French TTP 2 of 3 -- severe ADAMTS13 deficiency is highly likely.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 0
- Severe ADAMTS13 deficiency is very unlikely.
- 1
- Intermediate probability of severe ADAMTS13 deficiency.
- 2-3
- Severe ADAMTS13 deficiency is highly likely.
What you enter
- Platelet count
- Creatinine
- Antinuclear antibody (ANA) positive
How this is calculated
Citation
Coppo P, Schwarzinger M, Buffet M, et al. Predictive features of severe acquired ADAMTS13 deficiency in idiopathic thrombotic microangiopathies. PLoS One. 2010;5(4):e10208. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.