• Why is the test performed after completing treatment?

It is used to evaluate treatment effectiveness, as microfilariae are expected to disappear from the peripheral blood after completing the medication doses.

• Which physical symptoms may indicate a need for this test?

Symptoms include recurrent fever, inflammation of lymph nodes in the groin or armpit, and swelling of the limbs or genitals.

Medical Laboratories

Detect Filarial Parasites

Filaria Blood Film Examination

Microscopic examination to detect microfilariae in the blood, essential for diagnosing lymphatic filariasis and preventing chronic complications like limb swelling and infections.

Trusted medical contentUpdated: 04-09-2026Views: 50LHL-3099

About this service

A specialized microscopic examination of a thick and thin blood sample (blood film) stained with a special dye (such as Giemsa). This aims to detect and identify microfilariae (larvae) of nematode species that cause lymphatic filariasis (such as Wuchereria bancrofti, Brugia malayi) in the bloodstream. The sample is taken at a specific time (often night) that corresponds to the cyclical activity of the parasite in the peripheral blood.

Conditions and notices

Fasting is not required

The timing of the sample collection is crucial: blood should be drawn during the parasite's nocturnal activity period, usually between 10 p.m. and 2 a.m., unless a species with daytime activity is suspected.

Fasting is not required before taking the sample, but it is preferable to avoid fatty meals immediately before the examination.

You should inform your doctor about any medications you are taking, as some medications (such as diethylbazine) may temporarily reduce the number of microfilariae in the blood.

The microscopic slides (film) must be prepared and stained with Giemsa stain in the laboratory as soon as possible after the blood is drawn to ensure that the parasite's shape is preserved.

Frequently Asked Questions

Short answers to the FAQs published with this service.

• What is the purpose of the Filaria Blood Film Examination?

The test is a specialized microscopic examination used for the laboratory diagnosis of active lymphatic filariasis by identifying microfilariae larvae in the blood.

• Does this test require fasting?

No, fasting is not required for the Filaria Blood Film Examination.

• How does identifying the specific type of parasite help?

Identifying the parasite species based on its shape and size helps in determining the appropriate treatment and predicting the disease course.

• Can this test assess the severity of the infection?

Detect Filarial Parasites

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