Final answer:
In pleural effusion/empyema, the criteria for a complicated case include pleural fluid pH < 7.2, glucose < 60 mg/dL, and positive gram stain or culture.
Step-by-step explanation:
In the case of pleural effusion/empyema, the criteria for a complicated case are as follows:
- Pleural fluid pH < 7.2
- Glucose < 60 mg/dL
- Positive gram stain or culture
This means that if the pleural fluid has a pH below 7.2 and glucose levels below 60 mg/dL, or if there's a positive result in the gram stain or culture, the pleural effusion/empyema is considered complicated.