The TASH score calculator evaluates the risk of needing a massive transfusion for patients who have suffered a severe injury. To compute this score, it gathers inputs related to the patient's condition, assigns numerical values based on predefined criteria, and calculates a total score, which then determines the probability of requiring a massive transfusion.

The calculator collects the following inputs:

1. Sex (Female = 0, Male = 1)
2. Heart rate (> 120 bpm = 2, <= 120 bpm = 0)
3. Systolic blood pressure in mmHg (< 100 = 4, < 120 = 1, >= 120 = 0)
4. Hemoglobin in g/dL (< 7 = 8, < 9 = 6, < 10 = 4, < 11 = 3, < 12 = 2, >= 12 = 0)
5. Base excess in mmol/L (< -10 = 4, < -6 = 3, < -2 = 1, >= -2 = 0)
6. Presence of free intraabdominal fluid (Yes = 3, No = 0)
7. Clinically unstable pelvic fracture (Yes = 6, No = 0)
8. Open or dislocated femur fracture (Yes = 3, No = 0)

Each input option is translated into a score according to the criteria. The scores from these inputs are summed to determine the total TASH score.

The total score provides an interpretation as follows:

| Total Score | Probability Interpretation                     |
|-------------|------------------------------------------------|
| <= 8        | Probability for massive transfusion is < 5%    |
| 9           | Probability for massive transfusion is 6%      |
| 10          | Probability for massive transfusion is 8%      |
| 11          | Probability for massive transfusion is 11%     |
| 12          | Probability for massive transfusion is 14%     |
| 13          | Probability for massive transfusion is 18%     |
| 14          | Probability for massive transfusion is 23%     |
| 15          | Probability for massive transfusion is 29%     |
| 16          | Probability for massive transfusion is 35%     |
| 17          | Probability for massive transfusion is 43%     |
| 18          | Probability for massive transfusion is 50%     |
| 19          | Probability for massive transfusion is 57%     |
| 20          | Probability for massive transfusion is 65%     |
| 21          | Probability for massive transfusion is 71%     |
| 22          | Probability for massive transfusion is 77%     |
| 23          | Probability for massive transfusion is 82%     |
| >= 24       | Probability for massive transfusion is > 85%   |

This process ultimately yields both a numerical score indicating the severity of injury and an associated likelihood of needing massive transfusion, facilitating informed clinical decision-making.

The TASH Score, or Trauma Associated Severe Hemorrhage Score, is a clinical calculator used in the management of patients who have experienced severe trauma. This scoring system is specifically designed to predict the need for massive transfusion in these patients. 

The TASH Score takes into account several factors including patient's age, sex, blood pressure, heart rate, hemoglobin level, base excess, focused assessment with sonography for trauma (FAST), and injuries to the pelvis or femur. Each of these factors is assigned a certain number of points, and the total score is used to predict the likelihood of needing a massive transfusion.

The clinical utility of the TASH Score is to assist clinicians in making quick, evidence-based decisions about the need for massive transfusion in severely injured patients. This can help to optimize resource allocation and potentially improve patient outcomes.

The TASH Score should not be used in patients with minor injuries, as it is specifically designed for use in severe trauma. Additionally, it may not be appropriate for use in patients with certain pre-existing conditions that could affect the variables included in the score, such as chronic anemia or coagulation disorders.

TASH score for massive transfusion after severe injury

Revalidation and update of the TASH-Score: a scoring system to predict the probability for massive transfusion as a surrogate for life-threatening haemorrhage after severe injury.