Blood For Microfilaria

• Overview:

What is this test?

• This laboratory test is performed on a blood sample to detect the presence of larvae of a certain parasitic nematode i.e. Filariae. Microfilariae are detected by microscopic examination of a blood sample.

Why is this test performed?

This test is performed to help in the diagnosis of the following conditions caused by microfilariae:

1. Filariasis
2. Elephantiasis
3. Lymphangitis
4. Lymphadenitis
5. Tropical Eosinophilia.

• Sample collection: Blood sample is collected from a vein by a healthcare professional and stored in a sterilized tube
• The sample is sent to laboratory for further analysis.

1. Why the sample for microfilariae detection should be collected at night?

The sample for microfilariae detection should be collected preferably between 12 to 2 Am because the microfilariae are active during the night.

2. Which microfilariae can be detected through blood test?

• Wuchereria bancrofti
• Brugia malayi 
• B timori
• Loa loa 
• Mansonella perstans
• M ozzardi.

3. How to prepare for this test?

No special preparations are required for this test. Inform your doctor about the use of all prescribed and non-prescribed medicine. Wear a short sleeved shirt to ease the sample collection.

4. What are the symptoms of Filariasis?

• Fever
• Skin exfoliation
• Inguinal or axillary lymphadenopathy
• Testicular pain
• Limb swelling

5. What are the risks of this test?

Collecting blood from a vein is a very easy procedure and pose only minimum risk, including:

• Bruising
• Bleeding
• Infection
• Lightheadedness

• Negative
• Positive

Interpretation of test results:

• Negative: No microfilariae are detected in the blood. The possibility of Filariasis can be ruled out.
• Positive: Microfilariae are detected in the blood, Filariasis is confirmed.

You should get tested:

• If you have the sign and symptoms of microfilariae
• If your doctor suspects Filariasis or other conditions caused by microfilariae
• If infection is suspected after a mosquito bite.