FaridabadBy Dr B.C. Gupta, MD · 2026-10-01
Malaria is caused by Plasmodium parasites, which are passed to people through the bite of an infected female Anopheles mosquito. The illness usually begins with fever, chills, sweating, headache and body ache, and the fever may come in cycles. In this part of India, fever with chills is common during and after the monsoon, which is why malaria testing is requested often. Because several illnesses start the same way, the laboratory is what tells malaria apart from dengue, typhoid and viral fever.
The malaria smear: looking at the parasite directly
The malaria smear, often called PS for MP, stands for peripheral smear for malarial parasite. A drop of blood is spread on a glass slide, stained, and examined under the microscope. The thick smear is used to detect whether parasites are present at all, while the thin smear allows the pathologist to identify the species and to count how many red cells are infected. This is the traditional reference method, and it can distinguish Plasmodium falciparum from Plasmodium vivax, which matters because falciparum malaria can become severe quickly. The smear is most likely to be positive when the patient has fever or has had fever in the preceding hours.
The rapid antigen test: a quick answer
The rapid malaria antigen test detects proteins produced by the parasite in a small blood sample, with a result available in about fifteen to twenty minutes. It is useful when a fast answer is needed, or when a microscopist is not immediately available. The test can identify falciparum malaria specifically, and some kits also detect other species. The trade-off is that it may stay positive for some days after treatment, and it is less able to give a parasite count, so it is often paired with a smear.
Why timing and repetition matter
Parasite numbers in the blood rise and fall in cycles, so a single negative test does not always rule out malaria. If the first smear is negative but malaria is still suspected, the doctor may ask for the test to be repeated after some hours, often during or just after a fever spike, when parasites are easiest to find. This is why the centre asks when your fever started and when it last spiked before the sample is collected.
How to prepare
Malaria tests use a blood sample and do not need fasting. No special preparation is required. If you are already taking antimalarial medicine, mention it at the time of booking, because treatment can reduce the number of parasites and affect the result.
Which test will be used?
In practice, a fever with chills is often investigated with more than one test at the same time. Many clinicians order a malaria smear together with a rapid antigen test, and add dengue and typhoid testing because those illnesses also begin with fever. The centre offers malaria smear, malaria antigen and PS for MP, and can combine them with the other fever tests in a single sample so that you do not have to make repeated visits. Your doctor is the right person to interpret the results together with your symptoms and the timing of your fever.
This article is for general information only and is not medical advice. Always discuss your results and any health concerns with your doctor.
