A 32-year-old woman from Mumbai presents with fever, myalgia, and rash on day 5 of illness. Rapid dengue NS1 antigen test is positive. She has no warning signs and vital signs are stable. What is the most appropriate next step in management?

## Clinical Context This patient has dengue fever (NS1 positive) without warning signs or hemodynamic instability. She is in the febrile phase (day 5), approaching the critical phase (typically days 3–7). ## Management Approach for Non-Severe Dengue **Key Point:** Uncomplicated dengue fever (dengue without warning signs) can be managed as an outpatient with close monitoring, provided the patient has reliable access to care and can return within 24 hours. **High-Yield:** The WHO 2009 dengue management guidelines stratify patients into: - Dengue fever (no warning signs) → outpatient management - Dengue with warning signs → hospital admission - Severe dengue → ICU-level care ## Rationale for Correct Answer 1. **Baseline investigations** (platelet count, hematocrit) are essential to detect early hemoconcentration or thrombocytopenia, which signal entry into the critical phase. 2. **Patient counseling** on warning signs (persistent vomiting, severe abdominal pain, bleeding, lethargy, restlessness) enables early detection of progression. 3. **24-hour follow-up** allows reassessment of hemodynamic status and laboratory trends before the critical phase peaks (typically days 3–5 post-onset). **Clinical Pearl:** The critical phase (plasma leakage phase) usually begins when fever subsides. Daily monitoring of hematocrit and platelet trends is more informative than a single measurement. ## Why Outpatient Management Is Safe Here - No warning signs present - Stable hemodynamics - Day 5 of illness (critical phase may be imminent, but not yet established) - Reliable follow-up possible