VHOSPITAL.CLINIC · Diagnostic Test
Blood smear microscopy is the WHO gold standard for malaria diagnosis — it confirms the diagnosis, identifies the Plasmodium species, and quantifies parasitaemia to guide treatment urgency.
Thick and thin Giemsa-stained films detect malaria parasites directly. The thick film concentrates parasites for high sensitivity; the thin film preserves morphology for species identification and ring-form differentiation.
A finger-prick blood sample is spread on a glass slide and stained with Giemsa or Field's stain. Thick films are read first for detection (sensitivity); thin films confirm species. A minimum of 200 fields must be examined before reporting negative.
Positive: parasites visible — identify species (P. falciparum ring forms, banana-shaped gametocytes; P. vivax enlarged cells with Schüffner's dots; P. malariae band forms). Parasitaemia >2% indicates severe malaria. Negative film does not exclude malaria if pre-test probability is high — repeat at 12-hour intervals × 3.
Sensitivity: 75–95% (thick film, experienced microscopist). Specificity: >99%. Sensitivity drops in low-parasitaemia early infection and after partial treatment. Serial smears × 3 improve sensitivity to >99%.
An experienced microscopist can examine a blood smear within 30–60 minutes. Most laboratory results are available within 1–2 hours. Serial smears (three samples 12 hours apart) may be needed if initial smear is negative but clinical suspicion remains high.
Yes. Blood smear morphology allows species differentiation: P. falciparum shows multiple ring-infected cells and banana-shaped gametocytes; P. vivax shows enlarged infected cells with Schüffner's stippling; P. malariae shows band-form trophozoites.
Blood smear is considered the gold standard because it identifies species, quantifies parasitaemia, and detects mixed infections. RDTs are faster and can be used without laboratory equipment. WHO recommends confirming positive RDTs with blood smear when possible.
Blood Smear (Thick & Thin Film) helps confirm Malaria, which can cause these symptoms:
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