Urine cultures and antibiotic sensitivity testing guides which of the following?

Which white blood cell type is most often increased during bacterial infections?

Which white blood cell type is commonly associated with viral infections?

If one part of the WBC differential is slightly outside the normal range, what does that usually mean?

You are concerned that a post-surgical patient is becoming septic (infection). Labs show PCT: 1.2 mcg/L. How would you interpret this result?

Which inflammatory marker rises most rapidly (within 24-48 hours) in response to acute inflammation or infection?

A patient has fatigue, joint pain, and a rash. Labs show CRP: 8 mg/L (Normal < 10), ESR: 65 mm/hr (Normal < 29 for women). What conclusions can you draw?

Patient presents with severe abdominal pain, nausea, vomiting, fever, and profuse sweating. On exam you note severe pain on light palpation and rebounding. You are most concerned about perforation of the appendix, which lab could be most helpful to determine urgency of etiology?

Which of the following CSF results would indicate a possible subarachnoid bleed?