The calculator in question is the SIRS, Sepsis, and Septic Shock Criteria. SIRS stands for Systemic Inflammatory Response Syndrome, a condition that can lead to sepsis and septic shock. This calculator is used in the patient population of individuals suspected of having a systemic infection, particularly those in critical care or emergency department settings.

The clinical utility of this calculator is to help clinicians identify patients who are at risk for or are currently experiencing sepsis or septic shock. It uses criteria such as body temperature, heart rate, respiratory rate, and white blood cell count to determine the likelihood of a patient having SIRS, sepsis, or septic shock. 

There are no specific exclusion criteria for the use of this calculator. However, it should be noted that the SIRS criteria have been criticized for their lack of specificity, as they can be triggered by non-infectious conditions such as trauma, burns, or pancreatitis. Therefore, clinical judgment should always be used in conjunction with this calculator.

SIRS, sepsis, and septic shock criteria

# Criteria
 # SIRS criteria
A. Temperature > 38 degrees C [100.4 degrees F] or < 36 degrees C [96.8 degrees F]
B. Heart rate > 90
C. Respiratory rate > 20 or arterial partial pressure of carbon dioxide < 32 mmHg
D. White blood cell > 12,000/mcL, < 4,000/mcL, or > 10% bands
# Sepsis criteria
E. Suspected or present source of infection
# Severe sepsis criteria (organ dysfunction, hypotension, or hypoperfusion)
F. Lactic acidosis, systolic blood pressure < 90 mmHg or systolic blood pressure drop >= 40 mmHg of normal
# Septic shock criteria
G. Severe sepsis with hypotension, despite adequate fluid resuscitation
# Multiple organ dysfunction syndrome criteria
H. Evidence of >= 2 organs failing

# Conditions
- ((A and B) or (A and C) or (A and D) or (B and C) or (B and D) or (C and D) or (A and B and C) or (A and B and D) or (B and C and D) or (A and B and C and D)) and (H or (E and H) or (F and H) or (G and H) or (E and F and H) or (E and G and H) or (E and G and F and H))
- ((A and B) or (A and C) or (A and D) or (B and C) or (B and D) or (C and D) or (A and B and C) or (A and B and D) or (B and C and D) or (A and B and C and D)) and (G or (E and G) or (F and G) or (E and F and G))
- ((A and B) or (A and C) or (A and D) or (B and C) or (B and D) or (C and D) or (A and B and C) or (A and B and D) or (B and C and D) or (A and B and C and D)) and (F or (E and F))
- ((A and B) or (A and C) or (A and D) or (B and C) or (B and D) or (C and D) or (A and B and C) or (A and B and D) or (B and C and D) or (A and B and C and D)) and E
- (A and B) or (A and C) or (A and D) or (B and C) or (B and D) or (C and D) or (A and B and C) or (A and B and D) or (B and C and D) or (A and B and C and D)
- true