Fasting plasma glucose (FPG) Test

Purpose For fasting plasma glucose (FPG)  Test: Diagnose Blood sugar after 8 hours of fasting.

What is the Fasting Plasma Glucose Test?

The Fasting Plasma Glucose test, often abbreviated as FPG, is a simple blood test that measures the concentration of glucose (sugar) in your blood after an overnight fast.  Fasting allows healthcare professionals to get a baseline reading of your blood sugar levels when you haven’t consumed any carbohydrates.

Why is FPG Testing Important?

FPG testing is of paramount importance because it serves as a crucial tool in diagnosing diabetes and prediabetes. Detecting elevated blood sugar levels early is essential for timely intervention and the prevention of diabetes-related complications. By identifying individuals at risk, healthcare providers can initiate appropriate measures to manage and improve their health.

The Process of the FPG Test

  1. Preparation: Before taking the FPG test, you will be advised to fast for at least 8 hours. This usually means fasting overnight and scheduling the test for the morning.

  2. Blood Collection: During the test, a healthcare professional will draw a blood sample from a vein in your arm. 

  3. Interpreting the Results: FPG test results are typically reported in milligrams per deciliter (mg/dL). The normal range for fasting blood sugar levels is usually between 70 to 100 mg/dL.

Fasting plasma glucose (FPG) test – Normal Range

Healthy adult (male or female) after 8 hours of fasting>70 mg/dL and < 99 mg/dL
Pre Diabetes – (male or female) after 8 hours of fasting>100 to 125 mg/dL
Diabetes – (male or female) after 8 hours of fasting>126 mg/dL

FPG Test vs. Oral Glucose Tolerance Test (OGTT)

While the FPG test is a valuable tool for diagnosing diabetes, healthcare providers may also use the Oral Glucose Tolerance Test (OGTT) for a more comprehensive evaluation of glucose metabolism. The OGTT involves drinking a sugary solution and measuring blood glucose levels at various intervals.

When Should You Get an FPG Test?

It is recommended that individuals with risk factors for diabetes, such as a family history of diabetes, obesity, or gestational diabetes, undergo regular FPG testing. Your healthcare provider will guide you on the appropriate testing frequency based on your specific risk profile and health history.


In conclusion, the Fasting Plasma Glucose (FPG) test is an invaluable tool for the early detection of diabetes and prediabetes. By understanding the significance of this test and following your healthcare provider’s recommendations, you can take proactive steps towards managing your blood sugar levels and safeguarding your long-term health.

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