The Quick Sequential Organ Failure Assessment (qSOFA) score calculator evaluates three specific clinical criteria related to the patient's current health status. These criteria focus on indicators of organ dysfunction, which can suggest heightened risk of sepsis and increased mortality risk. There are three input options users need to consider:

1. Systolic blood pressure <= 100 mmHg
2. Respiratory rate >= 22/min
3. Altered mental status

Each criterion functions as a potential marker of sepsis. The calculator does not assign numerical values; instead, it assesses whether any combination of two or more criteria is met to determine if the patient is at heightened risk. The assessment logic is as follows:

- Determine if any two or more of the criteria are satisfied.
- If both Systolic blood pressure <= 100 mmHg and Respiratory rate >= 22/min are true, or if both Respiratory rate >= 22/min and Altered mental status are true, or if both Systolic blood pressure <= 100 mmHg and Altered mental status are true, the result is interpreted as "Meets criteria for sepsis. Risk of mortality is high."
- If fewer than two criteria are true, the result is "Criteria not met."
- If no selection is made for all inputs, advise the user to complete the inputs with "Please make a selection for all inputs."

This calculator has binary evaluation criteria: either the conditions are met indicating a higher risk of sepsis and mortality, or they are not, meaning the criteria for suspected sepsis are not met. Here is a representation of the input-output logic in assessing the sepsis risk:

| Criterion 1 | Criterion 2 | Criterion 3 | Output |
|-------------|-------------|-------------|--------|
| True        | True        | Any         | Meets criteria for sepsis. Risk of mortality is high. |
| Any         | True        | True        | Meets criteria for sepsis. Risk of mortality is high. |
| True        | Any         | True        | Meets criteria for sepsis. Risk of mortality is high. |
| False       | False       | False       | Criteria not met |
| Partial Input               |             |           | Please make a selection for all inputs. |

The Quick Sequential Organ Failure Assessment (qSOFA score) is a clinical tool designed for rapid identification of patients with suspected infection who are at greater risk of poor outcomes, including in-hospital mortality. The qSOFA score is particularly useful in non-intensive care settings where it can guide clinicians in making decisions about patient management and potential need for intensive care.

The qSOFA score is determined based on three primary components: systolic blood pressure less than or equal to 100 mmHg, respiratory rate greater than or equal to 22/min, and altered mental status. Each of these components is associated with increased risk of mortality in patients with suspected infection. 

The qSOFA score is calculated by assigning one point for each of the three components that are present. A higher score indicates a higher risk of mortality. The presence of two or more of these components (either systolic blood pressure <= 100 mmHg and respiratory rate >= 22/min, or respiratory rate >= 22/min and altered mental status, or systolic blood pressure <= 100 mmHg and altered mental status) meets the criteria for sepsis and indicates a high risk of mortality. If these criteria are not met, the risk of mortality is considered lower. 

The qSOFA score does not replace clinical judgment but rather provides a simple, bedside tool to help clinicians identify patients with suspected infection who may require higher levels of care.

The Quick Sequential Organ Failure Assessment, commonly known as the qSOFA score, is a clinical calculator used primarily in the patient population of adults who are suspected of having sepsis. The qSOFA score is a simplified version of the SOFA score (Sequential Organ Failure Assessment) and is used to identify patients with suspected infection who are at a greater risk of poor outcomes, such as prolonged intensive care unit stay, organ dysfunction, or death. 

The qSOFA score is calculated using three criteria: altered mental status, systolic blood pressure of 100 mmHg or less, and a respiratory rate of 22 breaths per minute or more. Each criterion is given 1 point, and a score of 2 or more suggests a high risk of poor outcome.

The qSOFA score is intended for use outside of the ICU, as it does not require lab results and can be calculated at the bedside. It is not recommended for use in pediatric populations or in patients without a suspected infection. It should also not be used as the sole method of diagnosing sepsis, but rather as a tool to identify patients who may require further evaluation and management.