Black woman in White shirt holding a glucometer and testing her normal blood sugar levels.

Glucose Test: How to Test for Normal Blood Sugar Levels

Black woman in White shirt holding a glucometer and testing her normal blood sugar levels.

Monitoring your blood sugar levels is an important part of managing your health and diabetes. A glucose test is the most common way to check blood sugar levels. Glucose tests measure the amount of sugar (glucose) in your blood sample and determine if your blood sugar levels are within a normal range. 

In this blog post, we’ll discuss normal blood sugar levels, why monitoring them is important, and how you can use a glucose test to measure them.

What is a Glucose Test?

A glucose test is a medical test that checks the amount of glucose (sugar) in a person’s blood. It is used to diagnose and monitor diabetes and other medical conditions that affect normal glucose levels, such as hypoglycemia. Glucose tests are commonly conducted using a glucometer, a small device that measures the glucose level in your blood.

There are two main types of glucose tests: fasting glucose test and random glucose test.

  • A fasting glucose test is usually done in the morning before breakfast. During this test, your blood sugar is tested after you have fasted.
  • A random glucose test is done at any time of day, regardless of when you last ate or drank.

To conduct a glucose test, you will need to prick your finger or arm with a lancet (a special needle). This will draw a drop of blood,1 which can then be placed on a test strip and inserted into the glucometer. The glucometer will then measure the amount of glucose in the sample and display the results on its screen.

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Normal Blood Sugar Levels

Eagle-view of a bowl of sugar cubes, a glucometer and an insulin injection pen on a table.Blood sugar levels can vary from person to person, and they are affected by many factors such as age, gender, physical activity level, and overall health. Blood sugar levels can also change depending on when you last ate and whether you’ve taken any insulin or other medication for diabetes. Generally speaking, the normal range for blood sugar levels who do not have diabetes is under 100mg/dL, with levels ranging from 100-125 mg/dL as an indicator of prediabetes and levels above 126 mg/dL as diabetes.

Maintaining normal blood sugar levels is important to prevent several health issues.

  • High blood sugar levels, also known as hyperglycemia, can result in dehydration, headaches, blurred vision, fatigue, and even coma.
  • Low blood sugar levels, or hypoglycemia, can cause dizziness, confusion, sweating, hunger, and even seizures.

If you have diabetes or have any questions or concerns about your blood sugar levels, it is important to contact your doctor. They can help monitor your blood sugar levels and advise the best treatment.

Why Test for Normal Blood Sugar Levels?

Glucose testing is a useful tool to assess your overall health and well-being. It is especially important to know your glucose level if you have been diagnosed with diabetes or are pre-diabetic. Your doctor may also recommend a glucose test if you have any of the following conditions: type 1 or type 2 diabetes, pre-diabetes, hypoglycemia, insulin resistance, or acanthosis nigricans. In addition, some doctors may suggest a glucose test if you have a family history of diabetes.

Regular glucose testing can help you better understand how food and exercise affect your blood sugar levels. This can help you make more informed decisions about your diet and lifestyle. Additionally, regular glucose testing can help you identify if you are at risk for developing diabetes or pre-diabetes and can also help you manage existing diabetes.

Your doctor should determine the frequency of glucose testing. Generally, people with diabetes should test their blood sugar multiple times throughout the day to monitor their glucose levels and adjust insulin levels accordingly. People without diabetes may need to test their blood sugar less frequently.

How to Test for Normal Blood Sugar Levels

Pretty blonde woman getting a glucose test while a nurse is taking a blood draw. Testing your blood sugar levels is critical to managing your health and diabetes. Knowing how to test for normal blood sugar levels can help you better understand your body and make sure you’re making the right choices for your health.

Several methods for testing your blood sugar levels include finger-stick tests, oral glucose tolerance tests, and continuous glucose monitoring. Consult with your medical professional to consult which method is most suited for your individual needs.

The Finger-stick Test 

This is the most common way to test for normal blood sugar levels and remains the quickest way to check your glucose levels. For this test, a drop of blood is collected from your fingertip, placed on a testing strip, and inserted into a meter that measures your glucose levels.

The Oral Glucose Tolerance Test

OGTT s a more comprehensive test that checks your body’s response to sugar over a specific time. Before an OGTT test, you must drink a liquid containing 75 grams of glucose, with several blood tests conducted over the next two hours to diagnose diabetes or prediabetes.

Continuous Glucose Monitoring

CGM is a newer technology tracking blood sugar levels throughout the day. This device involves wearing a small sensor on your body that continuously measures your glucose levels and sends the data to a receiver, which allows you to track your glucose levels better and make necessary adjustments.

Testing for normal blood sugar levels is important in managing your health. Knowing which method is right for you can help you get accurate readings and better manage your diabetes. Speak with your doctor to determine an ideal way to test for normal blood sugar levels, and follow all instructions for proper preparation.

Interpreting Glucose Test Results

A female doctor checking the normal blood sugar levels of a girl patient while her mother is overseeing. Glucose tests are used to measure your blood sugar levels, and the results can provide important insight into your health. Understanding how to read glucose test results is key to understanding your health.

Your doctor will interpret and discuss your glucose test results with you, but knowing what the numbers mean is beneficial. The glucose test results display the milligrams of glucose per deciliter of blood (mg/dL). Normal blood glucose levels typically range between 70 and 99 mg/dL.

If your glucose test results are higher than normal, this could indicate that you have diabetes, pre-diabetes, or other metabolic disorders. If your glucose test results are lower than normal, they could indicate hypoglycemia. This is often due to medications or other medical conditions. Whether your glucose levels are high or low, it’s important to talk to your doctor about any abnormal results.

Signs you passed your glucose test include a fasting glucose level of less than 100 mg/dL and a post-meal glucose level of less than 140 mg/dL two hours after eating. If you meet these criteria, then your doctor will likely consider you to be in the healthy range for blood sugar levels.


Maintaining optimal blood sugar levels is crucial to a healthy and balanced life. Testing your glucose levels with a glucose test is an effective way to monitor your health and ensure that you stay in the recommended range. It is essential to know the average blood sugar level range, how to test for them properly, and how to interpret the results. Understanding these concepts can help you make informed decisions about your health. If you have additional concerns, speak with your healthcare provider, who can offer personalized guidance.

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Lab Testing - Frequently Asked Questions

Why is it important to do lab tests occasionally?

It is important to do lab tests occasionally because they can provide valuable information about an individual's health and help to identify potential health issues early on. Lab tests can measure a wide range of factors, including blood count, cholesterol levels, liver and kidney function, and hormone levels, and can provide insight into an individual's overall health and wellness. Additionally, lab tests can help to diagnose and monitor the progression of certain medical conditions, such as diabetes and heart disease, and can help to identify any potential health risks or concerns. By doing lab tests occasionally, individuals can take proactive steps to maintain their health and wellbeing and reduce the risk of potential health problems in the future.

What does a routine blood test cover?

A routine blood test is used to check for a range of things, including your blood count and the levels of certain chemicals and substances in your blood. Blood tests can also be used to check how well certain organs, such as your liver and kidneys, are functioning.

How is a blood sample collected for lab testing?

A blood sample for lab testing is typically collected through a process called venipuncture, which involves inserting a small needle into a vein to draw blood. This is usually done on the inside of the elbow or the back of the hand.

What is the cost of a lab test?

In general, the cost of a lab test can range from a few dollars to several hundred dollars. It is always best to consult with your doctor or healthcare provider to get an accurate estimate of the cost of a lab test.

Read More: Lab Testing FAQ


[1] Hortensius J, Slingerland RJ, Kleefstra N, et al. - Self-Monitoring of Blood Glucose: The Use of the First or the Second Drop of Blood. Diabetes Care 1 March 2011; 34 (3): 556–560.;