Correct!
5. All of the above
The patient is apparently acutely ill. The source of the illness is unclear but the fever with tachypnea, tachycardia and chest x-ray suggest possible pneumonia with the possibility of sepsis. Urine cultures are indicated since urinary tract infections are a common source of infection and sepsis in adults. Although her blood pressure is well preserved and her lactate is normal, her clinical picture suggests a high possibility of intravascular volume depletion and fluids are appropriate. The severity of her illness suggests that empiric broad spectrum antibiotics are indicated. She was begun on vancomycin, cefepime and levofloxacin.
The initial Gram stain of her sputum and all bacterial cultures were negative.
To better define her thoracic process a CT scan was performed (Figure 3).
Figure 3. Representative images from admission thoracic CT scan.
Which of the following laboratory testing is least likely to be positive?