For healthcare professionals
ABC score for massive transfusion
The ABC score (Assessment of Blood Consumption) adds one point for each of four findings in an injured patient: a penetrating mechanism, systolic blood pressure 90 mmHg or lower, heart rate 120 per minute or higher, and a positive FAST scan. A score of 2 or more is counted as positive for a likely need for massive transfusion. This tool is written for clinicians and is not a diagnosis.
Findings on arrival
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What you will see
The ABC score from 0 to 4, which items scored, and whether it reaches the published cutoff of 2.
Educational only, not medical advice. Not a diagnosis. Treatment decisions belong to the treating team.
Source
The four items, one point each, and the cutoff of 2 as printed in Pouroushaninia and colleagues, PLOS One 2026, and Min and colleagues, Journal of Clinical Medicine 2026 (both open access, CC BY 4.0). The original paper by Nunez and colleagues, Journal of Trauma 2009, is cited, not quoted. The tests check every item and the edges at 90 mmHg, 120 per minute and a score of 2.
Validated in
Adult trauma patients. Pouroushaninia 2026: 329 adults at Sina Hospital in Tehran (July 2021 to December 2024) who received at least one unit of packed red blood cells. Min 2026: 1,462 patients at a trauma center in Korea (2020 to 2025) where blunt injury was most common.
Limits
Studies define massive transfusion differently: at least 3 units of packed red blood cells in the first 3 hours (Pouroushaninia 2026), or at least 4 units within 4 hours or at least 10 units within 24 hours (Min 2026). Because one item is a penetrating mechanism, a positive score is reached more easily after penetrating injury, which limits the score where blunt trauma predominates (Min 2026). A FAST scan must have been done for that item to count; a score without it may be too low.
Items
| Finding | Points |
|---|---|
| Penetrating mechanism of injury | 1 |
| Systolic blood pressure 90 mmHg or lower | 1 |
| Heart rate 120 per minute or higher | 1 |
| Positive FAST (focused assessment with sonography for trauma) | 1 |
The total runs from 0 to 4. Scores of 2 or more are classed as positive and scores below 2 as negative (Pouroushaninia 2026) (Min 2026). The score was first described by Nunez and colleagues (Nunez 2009).
Worked example: a stab wound with a heart rate of 125 per minute, systolic blood pressure 100 mmHg and a negative FAST scores 1 (penetrating) + 1 (heart rate) = 2, positive.
How it performed in a 2026 study
In 329 adult trauma patients in Tehran, 36 (10.9%) received a massive transfusion. An ABC score of 2 or more had (Pouroushaninia 2026):
| Measure | Value (95% CI) |
|---|---|
| Sensitivity | 69.4% (51.9 to 83.7) |
| Specificity | 94.2% (90.9 to 96.7) |
| Positive predictive value | 59.5% (43.3 to 74.4) |
| Negative predictive value | 96.2% (93.2 to 98.1) |
| C statistic | 0.84 (0.76 to 0.93) |
In the same study, patients with a score of 2 or more had 36.9 times the odds of massive transfusion (95% CI 15.6 to 87.3) compared with a score below 2. These are results from one hospital and depend on how often massive transfusion happened there.
Blunt trauma
Min and colleagues note that the ABC score needs only four variables, but that a positive score comes more easily with penetrating injury, which limits its use where blunt trauma predominates. In their blunt-predominant cohort they developed a different five-variable score (Min 2026).
Related calculators
The shock index calculator uses the same two vital signs as a ratio. The RABT score is a revised version that swaps the blood pressure and heart rate items for a shock index above 1 and adds pelvic fracture. For injured children, the SIPA pediatric shock index reads the shock index against a cut point for age. For head injury, see the Canadian CT Head Rule and the Glasgow Coma Scale calculator. For bleeding and clotting after major illness, see the ISTH DIC score. Other bedside scores are listed under For healthcare professionals.
Sources
- Pouroushaninia N, Ramezani Z, Jahangiri A, Rahimimovaghar N, O'Reilly G, Baigi V, Rahimi-Movaghar V. Performance of four scoring systems in predicting the need for massive transfusion in Iranian trauma patients. PLoS One. 2026;21(7):e0353398. doi:10.1371/journal.pone.0353398. PMID 42424387. Open access (CC BY 4.0). ABC items and cutoff of 2; sensitivity, specificity, predictive values, C statistic and odds ratio in 329 trauma patients. pmc.ncbi.nlm.nih.gov/articles/PMC13349299/
- Min SK, Yu B, Lee G, Choi K, Kim Y, Kang WS, Lee M. Development and validation of a simplified five-variable score for predicting massive transfusion in blunt-trauma-predominant patients. J Clin Med. 2026;15(16):6344. doi:10.3390/jcm15166344. PMID 42652748. Open access (CC BY 4.0). ABC items and cutoff of 2; limits of the penetrating item in blunt trauma. pmc.ncbi.nlm.nih.gov/articles/PMC13513371/
- Nunez TC, Voskresensky IV, Dossett LA, Shinall R, Dutton WD, Cotton BA. Early prediction of massive transfusion in trauma: simple as ABC (assessment of blood consumption)? J Trauma. 2009;66(2):346-352. doi:10.1097/TA.0b013e3181961c35. PMID 19204506. Original paper, cited, not quoted. doi.org/10.1097/TA.0b013e3181961c35
Written and maintained by the uncovermyrisk.com editorial team. We do not have a medical reviewer; every claim links to its primary source above. Last reviewed: 2026-11-04. Spotted an error? See About.