What is the TASH score?
The Trauma Associated Severe Hemorrhage (TASH) score is a weighted clinical prediction rule developed to estimate the likelihood that a multiply injured patient will require massive transfusion—often operationalized in practice as large-volume early blood component replacement within a defined time window after arrival. Rather than replacing physician judgment, the score organizes readily available emergency department and trauma bay findings into a single numeric index that reflects how strongly hemodynamic compromise, metabolic acidosis, anemia on early labs, imaging evidence of intraperitoneal fluid, and specific skeletal injuries cluster together in cohorts where hemorrhage drives resuscitation intensity.
Why early risk estimation matters in trauma
Severe hemorrhage remains a primary driver of preventable death after injury. Teams must simultaneously control bleeding sources, restore perfusion, and prepare blood products, activation of a massive transfusion protocol where one exists, and mobilization of interventional resources. Decisions are made under time pressure and incomplete information. A structured score can help teams communicate urgency, anticipate resource needs, and harmonize triage language across nursing, emergency medicine, surgery, and anesthesia, especially when initial presentation is evolving.
Massive transfusion itself is not a treatment goal; it is a marker of extreme physiologic threat. Probabilities attached to the TASH score should therefore be read as risk stratification from derivation data, not as automatic triggers. Institutional MTP criteria, surgeon assessment, imaging trajectory, and response to resuscitation remain central.
Population and conceptual basis
The score was derived and updated using large trauma registries with seriously injured adults, emphasizing patients in whom polytrauma and hemorrhagic shock are realistic concerns. The included variables were chosen because they capture perfusion (blood pressure and heart rate), oxygen-carrying capacity (hemoglobin), metabolic footprint of hypoperfusion (base excess on blood gas), sonographic evidence of free fluid in the abdomen (FAST), and injury patterns strongly associated with high-volume blood loss (unstable pelvic ring disruption and major femoral injury). Each component receives integer points; the composite ranges from 0 to 31, with higher totals corresponding to higher modeled probability of massive transfusion in the original reports.
How to score: components and points
Apply the first documented systolic blood pressure and heart rate from initial assessment when possible. Use the earliest available hemoglobin and base excess that reflect the patient’s condition on presentation—understanding that hemodilution after crystalloid may shift values over time. FAST positivity refers to free intraperitoneal fluid in the context of trauma evaluation. Pelvic and femoral injury items should reflect clinically relevant diagnoses tied to hemorrhage risk (e.g., patterns associated with mechanical instability or large soft-tissue and vascular injury), as judged by the treating team.
| Variable | Scoring |
|---|---|
| Sex | Male: 1 point · Female: 0 |
| Systolic blood pressure (first assessment) | <100 mmHg: 4 · <120 mmHg: 1 · ≥120 mmHg: 0 |
| Heart rate | >120 bpm: 2 · ≤120 bpm: 0 |
| Hemoglobin (g/dL) | <7: 8 · <9: 6 · <10: 4 · <11: 3 · <12: 2 · ≥12: 0 |
| Base excess (mmol/L) | <−10: 4 · <−6: 3 · <−2: 1 · ≥−2: 0 |
| Positive FAST (intra-abdominal fluid) | Yes: 3 · No: 0 |
| Clinically unstable pelvic fracture | Yes: 6 · No: 0 |
| Open or dislocated femur fracture | Yes: 3 · No: 0 |
Total TASH score = sum of all applicable items. Minimum 0, maximum 31.
Interpreting the total: probability bands (derivation cohort)
The mapping below summarizes reported massive transfusion probabilities by score in the original calibration; exact percentages vary by center, era, transfusion definitions, and case mix. Use the table to contextualize risk, not as a substitute for bedside dynamics.
| TASH score | Approximate MT probability | TASH score | Approximate MT probability |
|---|---|---|---|
| 0–8 | <5% | 17 | ~43% |
| 9 | ~6% | 18 | ~50% |
| 10 | ~8% | 19 | ~57% |
| 11 | ~11% | 20 | ~65% |
| 12 | ~14% | 21 | ~71% |
| 13 | ~18% | 22 | ~77% |
| 14 | ~23% | 23 | ~82% |
| 15 | ~29% | 24 | ~85% |
| 16 | ~35% | 25–31 | >85% |
Clinical nuances when applying the score
- Time-zero and treatment effects: Prehospital fluids, medications, and ongoing external bleeding can change blood pressure, heart rate, hemoglobin, and base excess after the first measurement. Reassessment often matters more than any single snapshot.
- Hemoglobin lag: Early hemoglobin may underestimate blood loss. A “low-normal” value in a patient with clear hemorrhagic shock still warrants aggressive evaluation.
- FAST limitations: A negative FAST does not exclude intra-abdominal injury or need for operation; obesity, timing, and operator factors affect sensitivity.
- Injury spectrum: Penetrating trauma, isolated head injury with minimal blood loss, or spinal shock may produce discordance between score and true transfusion need.
- External validity: Performance shifts across hospitals, blood product strategies, and massive transfusion definitions. Compare predicted risk to local experience and quality data.
How this calculator fits into workflow
Enter the patient’s sex, initial vital signs, best early laboratory values, FAST result, and whether high-risk pelvic or femoral patterns are present. The tool sums the TASH score and relates it to the published probability gradations. The output supports team situational awareness and documentation of structured risk assessment; it does not determine transfusion indications, operative decisions, or trauma bay leadership choices on its own.