Cut point of fasting blood sugar level indicates Diabetic Mellitus?

NORCET 2 -2021 (Shift-2)

Medical & Surgical Nursing

Easy

Appeared in: NORCET 2 -2021 (Shift-2)

Explanation

The American Diabetes Association (ADA) and World Health Organization (WHO) define the diagnostic cut-point for diabetes using fasting plasma glucose.
A fasting plasma glucose (FPG) value of 126 mg/dL (7.0 mmol/L) or higher indicates a diagnosis of Diabetes Mellitus.
This diagnosis should be confirmed by a repeat test on a different day in the absence of clear symptoms of hyperglycemia.
Values between 100 and 125 mg/dL are classified as Impaired Fasting Glucose (IFG), also known as prediabetes.

Option A: A value greater than 200 mg/dL is the diagnostic cut-off for diabetes, but for a random plasma glucose test (in a patient with classic symptoms) or a 2-hour post-oral glucose tolerance test (OGTT), not for a fasting test.
Option B: A blood glucose level of 180 mg/dL is significant as it is the approximate renal threshold for glucose. Above this level, glucose typically begins to spill into the urine (glucosuria), but it is not a primary diagnostic criterion for diabetes.
Option D: A value greater than 140 mg/dL is used in the context of the 2-hour oral glucose tolerance test (OGTT). A level between 140-199 mg/dL indicates impaired glucose tolerance (prediabetes).

Visual 1: Chart: A visual chart comparing the diagnostic thresholds for Fasting Plasma Glucose, Oral Glucose Tolerance Test, and HbA1c for Normal, Prediabetes, and Diabetes categories. This helps in memorizing and comparing the different criteria.

Clinical Relevance

Nursing practice connection: Knowing Diagnostic criteria for Diabetes Mellitus using fasting blood sugar levels helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses play a crucial role in screening patients for diabetes, especially those with risk factors like obesity, family history, or hypertension.
Patient education is vital. If a patient's result is in the prediabetes range (100-125 mg/dL), the nurse should provide counseling on lifestyle modifications (diet, exercise) to prevent or delay the onset of type 2 diabetes.
It is a key patient safety point to understand that a single elevated fasting glucose reading (unless extremely high or with clear symptoms) is not sufficient for diagnosis. A confirmatory test is required to avoid misdiagnosis.

How to Approach the Question

This is a factual recall question that tests your knowledge of specific laboratory values.
First, identify the key terms in the question: 'cut point', 'fasting blood sugar', and 'Diabetic Mellitus'.
Focus on the specific test mentioned, which is the 'fasting' blood sugar test. This is crucial because diagnostic values differ for fasting, random, and post-glucose load tests.
Recall the established diagnostic criteria from health authorities like the ADA or WHO.
Compare the recalled value with the given options. The standard cut-off is ≥126 mg/dL.
Select the option that matches this established criterion. In this case, '>126 mg/dl' is the correct choice.

Concept Tested & Keywords

Concept Tested: Diagnostic criteria for Diabetes Mellitus using fasting blood sugar levels.
Stem keywords: fasting blood sugar, Diabetic Mellitus, cut point
Lead-in keywords: indicates

QGX1jBqcjuv8-E0MWukbt3