Fasting Blood Sugar (FBS)

This test helps check how well your body controls blood sugar, which is important for diagnosing diabetes, prediabetes, and other health conditions related to blood sugar. Doctors often recommend this test if you have symptoms of high or low blood sugar, or as part of a regular health check-up. It is a simple and safe blood test that provides important information about your health.

What it Measures

Blood Glucose Level (Fasting):
This test checks the level of glucose in your blood after fasting. Glucose is the main source of energy for your body’s cells. The amount of glucose in your blood is controlled by a hormone called insulin.

Why is it Important

1. Early Detection of Diabetes:
   Many people with diabetes or prediabetes do not have symptoms in the early stages. The FBS test helps find these problems early, so you can take steps to manage your health and avoid complications.
2. Guides Treatment Decisions:
   If you already have diabetes, this test helps your doctor see if your treatment plan is working. If your blood sugar is too high or too low, your doctor may adjust your medicines, diet, or exercise routine.
3. Monitors Risk for Complications:
   High blood sugar over time can harm your heart, kidneys, eyes, and nerves. Regular FBS testing helps keep your blood sugar in a healthy range and lowers your risk of serious health problems.
4. Checks for Other Health Issues:
   Sometimes, high or low blood sugar can be caused by problems with your pancreas, liver, or adrenal glands. The FBS test can help your doctor find these issues.

When Should I Get This Test?

• If you have symptoms like frequent urination, increased thirst, or unexplained tiredness.
• If you have a family history of diabetes or risk factors such as obesity or high blood pressure.
• During routine health check-ups, especially if you are over 30 years old.
• If you are pregnant or planning to become pregnant (to check for gestational diabetes).
• If your doctor recommends it to monitor your diabetes, or after changes in your treatment plan.

Interpretation of Test Results

Understanding what your results might mean is helpful, but always discuss them with a doctor for a proper diagnosis.

(Note: Specific normal ranges can vary slightly between labs and depending on individual factors. Always refer to the ranges provided on your report and consult your doctor.)

Additional Information

• The FBS test is only one part of diagnosing diabetes. Your doctor may order more tests if your result is abnormal.
• Some medicines, stress, or illness can affect your blood sugar levels. Tell your doctor about any medicines you are taking.
• Regular exercise, a healthy diet, and following your doctor’s advice can help keep your blood sugar at healthy levels.

Test Requirements

• Sample Type: Blood sample, usually taken from a vein in your arm.
• Preparation: You must fast (not eat or drink anything except water) for 8 to 12 hours before the test. Take your medicines as prescribed unless your doctor tells you otherwise.
• Precautions: Inform your doctor about any health conditions or medicines you are taking. Avoid strenuous exercise before the test.

Frequently Asked Questions (FAQs)

1. Why do I need to fast before a Fasting Blood Sugar (FBS) test, and can I drink water during fasting?
   Fasting is needed because eating or drinking (except water) can raise your blood sugar and give incorrect results. Fasting for 8–12 hours before the test helps your doctor see your true blood sugar level. You can and should drink plain water during fasting to stay hydrated, but avoid tea, coffee, or juice.
2. Does it check for HbA1C, and what does a high HbA1C mean?
   It measures your current blood sugar, not HbA1C. It is a different test that shows your average blood sugar over the past 2–3 months. A high HbA1C means your blood sugar has been high for a while, but it does not always mean you have diabetes-other conditions can affect the result. Always discuss your HbA1C results with your doctor for the right advice.
3. I am pregnant. Is it safe, and why might my doctor order it?
   Yes, it is safe during pregnancy. Doctors often use it to check for gestational diabetes, a type of diabetes that can develop during pregnancy. This helps protect both you and your baby by making sure your blood sugar is at a healthy level.
4. What should I do if my test result is abnormal?
   If your test result is higher or lower than normal, do not panic. Sometimes, stress, illness, or medicines can change your blood sugar. Share your results with your doctor, who may suggest more tests or changes to your diet, exercise, or medicines. Never change your treatment without talking to your doctor first.
5. Can I take my regular medicines before the test?
   Most medicines can be taken as usual, but some may affect your blood sugar. Always tell your doctor about all medicines you take before the test. Your doctor will tell you if you need to stop or adjust any medicines before your test.

Test requirements