Monsoon fever in Bangalore: which tests to ask for and when

Bangalore's monsoon (June–October) brings a predictable wave of viral and vector-borne fevers. Testing early and testing right matters — Day 1 tests miss half the cases. Here is the timeline doctors typically follow.

Sequence by day of fever

• Day 1–2: CBC + NS1 (dengue) + malaria antigen (parasite dual). Chikungunya PCR if joint pains are severe.
• Day 3–5: Repeat CBC (platelet trend), dengue NS1 + IgM. Typhoid: blood culture (not Widal) if fever persists.
• Day 5+: Dengue IgG, urine routine, LFT if you look unwell.

What each test does

• CBC — falling platelets and rising haematocrit warn of dengue severity.
• NS1 antigen — positive Days 1–5 of dengue; misses cases after Day 5.
• Dengue IgM — positive from Day 4 onwards.
• Malaria antigen — same-day, high specificity.
• Blood culture (typhoid) — the reliable test. Widal is unreliable and no longer recommended alone.

Price bands in Bangalore

• CBC: ₹200–₹350
• Dengue NS1 + IgM + IgG: ₹800–₹1,500
• Malaria antigen: ₹300–₹500
• Blood culture: ₹500–₹900
• Typhi-Dot / Salmonella IgM: ₹450–₹700

FAQ

Which fever test is most important in Bangalore monsoon?

On Day 1–2 of fever, dengue NS1 antigen and CBC are the two most useful tests. Add a malaria antigen if the fever pattern suggests it.

Is the Widal test reliable for typhoid?

No — Widal has high false-positive rates in India. Blood culture is the reliable test for typhoid. Some doctors add Typhi-Dot IgM as a rapid supplement.

When should I repeat a dengue test?

If NS1 is negative on Day 1–2 but fever continues, repeat CBC daily and add IgM after Day 3–4. Falling platelets or rising haematocrit needs urgent medical review.

Is home sample collection okay for dengue tests?

Yes. All major Bangalore chains collect samples at home and turn around dengue NS1 within 4–6 hours.

Does drinking water before a dengue test affect results?

No. Fever panels are not affected by fasting or hydration status.