Which test is not done for malaria?

Appeared in: MP CHO-2020

Explanation

A Hemoglobin test measures the concentration of hemoglobin in the blood.
It is used to diagnose and monitor anemia, a common and serious complication of malaria, particularly severe falciparum malaria.
This test does not detect the presence of the Plasmodium parasite, which is the causative agent of malaria.
Therefore, it is not a diagnostic test for the disease itself but is crucial for managing the patient's condition.

Option A: Rapid Diagnostic Tests (RDTs) are a cornerstone of modern malaria diagnosis, especially in field settings.
Option B: Serological tests are used in the context of malaria, although not for diagnosing an acute illness.
Option C: Microscopic examination of blood smears is the definitive gold standard for diagnosing malaria.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Diagnostic methods for Malaria as background academic context rather than a clinical decision trigger.
Choosing the appropriate test is critical. In a remote clinic without a lab, an RDT is the first-line choice for a patient with fever. In a hospital, microscopy is preferred for its detailed information.
Monitoring hemoglobin is a vital nursing responsibility in managing a patient with malaria. A significant drop indicates worsening hemolysis and the potential for severe anemia, requiring urgent intervention like a blood transfusion.
What if? If a patient with suspected malaria has a negative RDT but is still very ill, a microscopic blood smear is mandatory. Some RDTs can give false negatives in cases of very high or very low parasitemia, or due to gene deletions in the parasite (e.g., HRP2 deletion).

How to Approach the Question

First, identify the negative framing of the question: 'Which test is NOT done...'. This means you are looking for the option that does not fit with the others.
Analyze the options provided. You have 'Rapid diagnostic test', 'Serological test', 'Microscopic test', and 'Hemoglobin test'.
Recall or deduce the purpose of each test in the context of malaria. The first three are all methods to detect the parasite or the body's immune response to it.
Consider the 'Hemoglobin test'. This test measures red blood cell levels and is used to check for anemia.
Recognize that anemia is a complication or consequence of malaria, not the disease itself. Therefore, a hemoglobin test does not diagnose malaria, even though it's an important test for a malaria patient.
Conclude that the hemoglobin test is the correct answer as it is not a primary diagnostic test for malaria.

Concept Tested & Keywords

QvtALEc4Je-TGrENWvh3eH

E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart B (pp 202-403 of 604) p. 120-122

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 2179-2181

E6 Medicine Harrison 22e Part 1 p. 1810-1812

Practise the full MP CHO-2020

Attempt every question from this paper in a timed mock, then review the full solution for each one.