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1 BIOLOGY MCQS

What does A1C measure in the blood test?

  • Total cholesterol
  • Blood sugar level for three months
  • Fructosamine
  • Muscle strength
Correct Answer: B. Blood sugar level for three months

Detailed Explanation

The A1C test, also known as glycated hemoglobin test, is a crucial blood test for monitoring long-term blood sugar levels in humans. It provides an average measure of glucose in the blood over the previous two to three months, offering insights into a person’s diabetes management and risk of complications.


🔹 How A1C Works




  • Hemoglobin is a protein in red blood cells that carries oxygen.




  • Glucose in the bloodstream can attach to hemoglobin, forming glycated hemoglobin.




  • The A1C test measures the percentage of hemoglobin molecules that have glucose attached.




  • Higher A1C percentages indicate higher average blood glucose levels over time.




🔹 Normal and Risk Ranges




  • Normal: Less than 5.7%




  • Prediabetes: 5.7% – 6.4%




  • Diabetes: 6.5% or higher




🔹 Importance of A1C




  1. Diabetes Diagnosis: Confirms long-term blood sugar levels, complementing fasting glucose tests.




  2. Monitoring Diabetes: Helps doctors evaluate if treatment plans (diet, exercise, or medication) are effective.




  3. Predicting Complications: Higher A1C levels correlate with increased risk of heart disease, kidney damage, and vision problems.




🔹 Why Not Other Options?




  • Total cholesterol: Measures blood lipids, unrelated to A1C.




  • Fructosamine: Measures blood sugar over the past 2–3 weeks, not 3 months.




  • Muscle strength: Not related to blood glucose or hemoglobin.






✅ Key Facts Recap




  • A1C = glycated hemoglobin test




  • Measures average blood sugar over 2–3 months




  • Used for diabetes diagnosis and monitoring




  • Normal range: <5.7%, Diabetes: ≥6.5%




👉 Correct Answer: Option 2 – Blood sugar level for three months

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