Fasting blood sugar is done to detect?

BCCL kharkhanda Staff Nurse - 2015

Biochemistry & Nutrition

Easy

Appeared in: BCCL kharkhanda Staff Nurse - 2015

Explanation

The Fasting Blood Sugar (FBS) test, also known as Fasting Plasma Glucose (FPG), is specifically designed to measure the concentration of glucose in the bloodstream.
The test is conducted after a patient has fasted (had no caloric intake) for at least 8 hours to establish a baseline glucose level that is not influenced by a recent meal.
Its primary purpose is to screen for and diagnose metabolic conditions such as prediabetes and diabetes mellitus by identifying hyperglycemia (high blood sugar).

Option A: The FBS test measures glucose, not insulin. Insulin is a hormone that regulates glucose, and its levels are measured by a different test (e.g., fasting insulin assay).
Option C: While a series of FBS readings can show trends, the test provides a snapshot of glucose at one point in time. It is not the primary test for determining the long-term 'course' or control of diabetes.
Option D: The FBS test provides data that informs treatment decisions, but it does not 'detect' the treatment itself. It measures the physiological variable (glucose) that the treatment aims to control.

Clinical Relevance

Nursing practice connection: Knowing Purpose of Fasting Blood Sugar (FBS) Test helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses are responsible for providing clear instructions to patients, emphasizing the need for an 8- to 12-hour fast before the test to ensure the accuracy of the results.
Accurate interpretation of FBS results is a key nursing skill for early identification of hyperglycemia, initiating timely interventions, and providing patient education on lifestyle modifications or medication.
What if? If a patient with known diabetes has a high FBS reading, the nurse's first action is to assess the patient for signs of hyperglycemia (like excessive thirst or urination) and check if they have taken their medication as prescribed, before reporting to the doctor.

How to Approach the Question

First, break down the question's key term: 'Fasting blood sugar'. 'Blood sugar' is a common term for blood glucose.
The question asks what this test is done to 'detect'. This points to the primary measurement of the test.
Evaluate the options. Option B, 'Amount of glucose in blood', directly matches the definition of a blood sugar test.
Consider the other options as potential distractors. 'Amount of insulin' is a different hormone. 'Course of diabetes' refers to long-term monitoring (better measured by HbA1c). 'Treatment of diabetes' is the action taken based on the test result, not what the test detects.
Confirm that the most direct and fundamental purpose of a blood sugar test is to measure sugar (glucose). This makes Option B the correct answer.

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