When Is ID Discussion Reasonable for Positive Blood Cultures?

Quick answer

Positive Blood Culture Triage

• ID discussion is reasonable for S. aureus bacteremia, persistent bacteremia, fungemia, endocarditis concern, unclear source, infected hardware, or resistant organism concern.
• Before calling, gather culture source/date, organism, susceptibilities if available, number of positive bottles/specimens, repeat culture status, antibiotics, and suspected source.
• Source-control questions may require surgery, IR, line removal, ortho, urology, ENT, or another service first or concurrent.

ID discussion is reasonable when

Higher-Yield Consult Context

• S. aureus bacteremia, persistent bacteremia, fungemia, endocarditis concern, or metastatic infection concern is present.
• There is prosthetic material, hardware, intravascular line concern, unclear source, or repeat cultures remain positive.
• Resistance, allergy, toxicity, or antimicrobial narrowing/escalation question changes strategy.

Workup or another service usually comes first when

Better First Step

• The culture source, collection timing, organism, and clinical syndrome are not yet known.
• A drainable collection, infected line, obstruction, or operative target needs source-control ownership clarified.
• The question is antibiotic duration before source, cultures, and clinical response are defined.

Common pitfall

Do Not Call With Just Positive Cultures

The useful question is whether ID can change source evaluation, repeat-culture strategy, endocarditis/deep infection workup, source control, or antimicrobial strategy.