T-MACS (Troponin-only Manchester ACS Decision Aid)
T-MACS probability of acute coronary syndrome from six clinical items and the arrival hs-troponin T.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- ECG ischaemia
- No
- Worsening or crescendo angina
- No
- Pain radiating to the right arm or shoulder
- No
- Pain associated with vomiting
- No
- Sweating observed
- No
- Hypotension
- No
- High-sensitivity troponin T on arrival
- 12
Result: T-MACS probability of ACS 2.4%: low risk
The tool opens with these values already filled in. Replace them with your own.
What you enter
- ECG ischaemia
- Worsening or crescendo angina
- Pain radiating to the right arm or shoulder
- Pain associated with vomiting
- Sweating observed
- Hypotension (systolic below 100 mm Hg)
- High-sensitivity troponin T on arrival (ng/L)
How this is calculated
Citation
Body R, et al. Troponin-only Manchester Acute Coronary Syndromes (T-MACS) decision aid. Emerg Med J 2017;34:517-523, read in two open reprints of the equation (Diagn Progn Res 2021, PMC8499458; BMJ Open 2019, PMC6731951) and the risk groups (BMJ Open 2019, PMC6830682). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.