Before having blood test of T4, the patient should be informed that

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024

Explanation

The correct instruction for a patient scheduled for a T4 blood test is that fasting is not necessary.
Thyroid hormone levels (T3, T4) are relatively stable and are not significantly affected by the recent ingestion of food or fluids.
This makes the test convenient as it can be performed at any time of the day without special dietary restrictions beforehand.

Option A: Stopping thyroid medication is generally incorrect. The purpose of the test is often to monitor the effectiveness of the current medication dosage to see if the patient is within the therapeutic range.
Option C: A T4 test is a serum blood test. A 24-hour urine collection is a completely different type of diagnostic test used to measure substances excreted by the kidneys over a full day, such as certain hormones or proteins, but not typically T4.
Option D: A standard T4 blood test requires only a single successful venipuncture to collect one sample of blood.

Clinical Relevance

Nursing practice connection: Safe nursing care depends on performing Patient education for thyroid function tests in the correct sequence, documenting the action clearly, and monitoring for the expected response.
A nurse's primary role in diagnostic testing is patient education. Providing clear and accurate instructions reduces patient anxiety, improves compliance, and ensures the accuracy of test results.
Incorrect preparation, such as stopping medication or unnecessary fasting, can lead to inaccurate results, potentially causing incorrect diagnosis or treatment adjustments.
What if the patient was scheduled for both a T4 test and a fasting blood glucose test? In this case, the nurse must instruct the patient to fast. The instruction must be tailored to the most restrictive requirement of all tests being performed.

How to Approach the Question

First, identify the core of the question, which is about patient instructions for a specific lab test: T4.
Recall the standard protocol for thyroid function tests. Think about diet, medication, and sample collection method.
Evaluate each option against this standard protocol.
Option A (Stop medication): Is the test usually for baseline or monitoring? It's usually for monitoring, so stopping medication is wrong.
Option B (Fasting not necessary): Do thyroid levels fluctuate with meals? No. This is a plausible correct answer.
Option C (24-hour urine): Is T4 measured in urine or blood? It's a blood test. This is incorrect.

Concept Tested & Keywords

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E6 Nursing Brunner Adult Health 3SA Vol 1 Part 4 pp. 15-17, 14-16

E6 Medicine Harrison 22e Part 2 p. 930-932

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