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
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.