APACHE-II score includes –
**Core Concept**
The APACHE-II score is a severity-of-disease classification system used to assess the risk of mortality in critically ill patients. It takes into account various physiological and laboratory parameters, including temperature, mean arterial pressure, heart rate, respiratory rate, oxygenation, arterial pH, and laboratory values.
**Why the Correct Answer is Right**
The APACHE-II score includes a wide range of clinical parameters to evaluate the severity of illness in patients. This scoring system was developed to provide a standardized method for assessing disease severity and predicting mortality in critically ill patients. The correct answer is one of the physiological parameters that are included in the APACHE-II score.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a parameter included in the APACHE-II score.
**Option B:** This option is incorrect because it is not a direct measure of disease severity and is not included in the APACHE-II score.
**Option C:** This option is incorrect because it is not a parameter that is used to assess the severity of illness in critically ill patients.
**Clinical Pearl / High-Yield Fact**
Remember that the APACHE-II score is a useful tool for assessing disease severity and predicting mortality in critically ill patients. However, it should be used in conjunction with clinical judgment and other diagnostic tools to provide a comprehensive assessment of patient care.
**Correct Answer: D. White blood cell count**