The primary purpose of the Schilling test is to measure the client's ability to?

AIIMS Bhopal NO - 2018 (Shift-1st)

Medical Surgical Nursing

Easy

Appeared in: AIIMS Bhopal NO - 2018 (Shift-1st)

Explanation

The Schilling test is a diagnostic procedure designed to evaluate the body's ability to absorb vitamin B12 from the small intestine.
It works by administering an oral dose of radioactively labeled vitamin B12 and then measuring the amount that is excreted in the urine over a 24-hour period.
A low level of excreted radioactive B12 indicates a problem with absorption (malabsorption).
The test can be performed in multiple stages, such as adding intrinsic factor, to differentiate the specific cause of malabsorption, like pernicious anemia.

Option B: Vitamin B12 is a micronutrient that is absorbed directly into the bloodstream from the gut; it does not undergo digestion in the way that larger food molecules like proteins or carbohydrates do.
Option C: The human body cannot synthesize or produce vitamin B12. It is an essential vitamin that must be obtained from external sources, primarily animal-based foods or supplements.
Option D: While the liver does store a significant amount of vitamin B12, the Schilling test is designed to measure the dynamic process of uptake from the intestine, not the static quantity of reserves in the liver.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Purpose of the Schilling test for Vitamin B12 absorption as background academic context rather than a clinical decision trigger.
Nurses are responsible for educating the patient about the Schilling test procedure, which includes fasting and meticulous 24-hour urine collection, to ensure the accuracy of the results.
Understanding the results is key for patient care. A diagnosis of pernicious anemia via the Schilling test indicates a need for lifelong vitamin B12 replacement therapy, typically through injections, which is a critical teaching point for nurses.
What if? If a patient has a history of ileal resection (surgical removal of the final section of the small intestine), the nurse should anticipate that the Schilling test will show low B12 absorption in both Stage I and Stage II, because the primary site for B12 absorption has been removed.

How to Approach the Question

First, identify the key term in the question: 'Schilling test'. Recognize this as a specific diagnostic procedure.
Recall the context of the Schilling test, which is related to vitamin B12 deficiency and megaloblastic anemia.
Analyze the physiological processes related to vitamin B12 listed in the options: absorption, digestion, production, and storage.
Systematically eliminate the incorrect options. The body cannot 'produce' B12. B12 is 'absorbed,' not 'digested.' The test measures a process (uptake), not a static quantity ('storage').
This process of elimination leaves 'absorb' as the only logical function being measured.
Confirm this by recalling that the test involves giving an oral substance and measuring its appearance in the urine, a classic method for assessing gastrointestinal absorption.

Concept Tested & Keywords

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E6 Pharmacology Katzung 16e p. 934-936

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