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Home > Patient & Family Resources > Health Library > Thick and Thin Blood Smears for Malaria
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Doctors use thick and thin blood smears to determine whether you have malaria. If one test is negative and no parasites are found, you will have repeated blood smears every 8 hours for a couple of days to confirm that there is no malaria infection.
Blood smears are taken most often from a finger prick. Thick and thin blood smears will let doctors know the percentage of red blood cells that are infected (parasite density) and what type of parasites are present.
To date, microscopic examination of thick and thin blood smears is the easiest and most reliable test for malaria.
Results of thick and thin blood smears may show:
No parasites are present in red blood cells. Your doctor will repeat the test every 8 hours for 1 or 2 days if he or she still suspects that you have malaria.
Parasites are present in red blood cells. The infecting species of Plasmodium is identified. Also, the percentage of red blood cells infected by the Plasmodium parasite (density) is determined.
Treatment may vary depending on the:
Blood smears are the most reliable tests for malaria. You may want to ask whether a thick or thin blood smear, or both, is planned. A thin blood smear will identify the species of the malaria parasite. This information is important to prevent or anticipate life-threatening complications if P. falciparum is the source of infection.
Current as of:
July 1, 2021
Author: Healthwise StaffMedical Review: E. Gregory Thompson MD - Internal MedicineAdam Husney MD - Family MedicineW. David Colby IV MSc, MD, FRCPC - Infectious Disease
Current as of: July 1, 2021
Author: Healthwise Staff
Medical Review:E. Gregory Thompson MD - Internal Medicine & Adam Husney MD - Family Medicine & W. David Colby IV MSc, MD, FRCPC - Infectious Disease
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