Sepsis Diagnosis and Management in Immunocompromised Patients

Diagnostic Criteria

The American College of Physicians suggests that an absolute neutrophil count of 14.5 K/μL with 85.9% neutrophils approaches the threshold (>90%) that carries a likelihood ratio of 7.5 for bacterial infection 2
A manual differential is essential to assess for left shift (≥16% bands) which has a likelihood ratio of 4.7 for bacterial infection even with normal WBC, as recommended by the Infectious Diseases Society of America 1, 2
The presence of thrombocytopenia is a red flag for infection/sepsis, as stated by the American Society of Hematology 1

The Centers for Disease Control and Prevention recommend checking for fever/hypothermia (>38°C or <36°C), hypotension (<90 mmHg systolic), tachycardia, tachypnea, altered mental status to assess for sepsis criteria 1
Obtaining lactate level—if >3 mmol/L, this indicates severe sepsis, as suggested by the Society of Critical Care Medicine 1
Monitoring urine output—oliguria (<30 ml/h) suggests sepsis, as recommended by the National Institute of Diabetes and Digestive and Kidney Diseases 1

The American College of Emergency Physicians recommends initiating broad-spectrum empiric antibiotics within 1 hour of recognition if sepsis is suspected, and aggressive fluid resuscitation for hypotension 1
The Society of Critical Care Medicine suggests vasopressor support if hypotension persists despite fluids, and source control measures (remove infected catheters, drain abscesses) 1
The Infectious Diseases Society of America recommends completing diagnostic workup before antibiotics if the patient is hemodynamically stable, and initiating targeted antibiotic therapy based on suspected source and local resistance patterns 1

The Centers for Disease Control and Prevention recommend not treating asymptomatic bacteriuria in dialysis patients—only treat if symptomatic UTI present, as stated by the Journal of the American Geriatrics Society 4
The American Society of Nephrology suggests not relying on automated analyzer alone—manual differential is mandatory, as recommended by Praxis Medical Insights 1, 3