• Blood count, urea and electrolytes, liver tests, clotting screen, glucose, and CRP
• Repeated blood cultures, urine culture, chest x ray
• Serology and PCR tests (take advice)
• Sputum culture or bronchoscopy + lavage CNS signs
Abdominal signs, postabdominal surgery or no obvious cause of sepsis
• Abdominal ultrasound + CT
The most common radiological investigations include chest x ray film and abdominal CT scanning (Box 7.3). Laparotomy does not improve outcome in a critically ill patient in whom radiological examination has failed to show a surgically correctable problem.
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