Type 2 diabetes monitoring: Blood sugar tests and health screenings

From mcpress.mayoclinic.org

If you have type 2 diabetes, measuring your blood sugar level, also called blood glucose level, is a useful way to track the status of your condition. But because high blood glucose can cause issues in your heart, kidneys, and even your eyes and feet, the best management strategies include additional tests to check for complications.

Keeping up with recommended testing and understanding test results empowers you to make informed decisions about your diabetes care. By working alongside your care team to refine your diabetes management plan, you can take steps to improve your health and happiness.

Blood sugar monitoring tests for type 2 diabetes

When you eat, your body breaks down the food into glucose, a type of sugar that fuels the cells throughout your body. The glucose enters your blood and gets into your cells with help from a naturally occurring hormone called insulin.

All types of diabetes stem from an issue in the interaction between blood glucose and insulin. If you have type 2 diabetes, your body doesn’t make enough insulin, can’t use insulin effectively or both. This causes glucose to build up in your blood. If your blood glucose level is too high too often, it can cause issues throughout your body.

There are a few methods for measuring your blood glucose level. Each serves a unique purpose. Using them together can create a clearer picture of your diabetes.

                                                                                                                   Getty Images

The A1C test measures blood sugar levels over time

The A1C blood test offers an overhead view of your average blood glucose level. “It’s a nice barometer for a three-month period,” explains Jessica R. Wilson, M.D., M.S., an endocrinologist and diabetes expert at Mayo Clinic in Jacksonville, Florida. The A1C test’s broad perspective is most useful for diagnosing diabetes and determining whether changes in your diabetes management plan, such as a new medicine or exercise routine, are affecting your condition.

The A1C test is sometimes called the glycated haemoglobin test. This is because the test doesn’t directly examine blood glucose levels. Instead, it measures what percentage of haemoglobin, a protein in your red blood cells, is coated with sugar in a process called glycation. The more glucose there is in your blood, the more haemoglobin gets glycated.

Any factor that influences your haemoglobin can interfere with A1C test accuracy. This can include having low iron, kidney disease, a low red blood cell count or a gene that influences the shape of your red blood cells.

If you have type 2 diabetes, the American Diabetes Association (ADA) recommends getting an A1C test at least twice every year. The best A1C test result to aim for depends on your age and diabetes history. An A1C result of less than 7% is a common goal for adults who have diabetes. If your A1C results are lower than this benchmark, “there’s a lower risk of eye damage, kidney damage, nerve damage and other complications,” Dr. Wilson says.

A blood glucose meter: A “snapshot” of blood sugar levels

While the A1C test is an important tool, people who have diabetes also need a quick way to check their current blood glucose levels. Using a blood glucose meter enables you to independently and accurately check your level within seconds. 

To use most blood glucose meters, you first insert a test strip into the device. Then you poke the side of a clean fingertip with a small needle, called a lancet, to release a drop of blood. When you touch the test strip to the blood, the meter shows your blood glucose level on a screen.

“The challenge is that doesn’t tell you how long it was at that level,” Dr. Wilson says. Everyone’s blood glucose levels naturally rise and fall throughout each day. Seeing a high or low result on a blood glucose meter could indicate that you took a snapshot during a natural swing. Or it could be evidence of a sustained issue. With a blood glucose meter, the only way to measure your level over time is to repeat the test throughout a certain period. This can be inconvenient and time-consuming.

Continuous glucose monitors track blood sugar throughout the day

Efforts to fill in the gap between the A1C test’s big picture and a blood glucose meter’s snapshot led to the development of the continuous glucose monitor. This device estimates the glucose level in the fluid between your cells, also called interstitial glucose, over time. The level of interstitial glucose is usually similar to the glucose level in your blood.

A continuous glucose monitor includes a tiny sensor inserted under your skin. The sensor transmits data to a receiver or your smartphone, which allows you to review your estimated glucose level minutes after the measurement was collected.

Automatically gathering a set of data points allows both you and your care team to build a clearer understanding of how your blood glucose changes throughout each day, Dr. Wilson says. Pairing a continuous glucose monitor with a log of day-to-day events — such as eating, taking a medicine or exercising — can help you optimize your diabetes management plan, especially if you’re using insulin therapy.

Like other glucose measuring tools, continuous glucose monitors aren’t always accurate. Compressing the sensor, which may happen while you’re sleeping, can cause the device to falsely indicate low blood glucose. Certain medicines also can affect readings.

Why is screening for type 2 diabetes complications important?

Measuring blood glucose is critical for tracking diabetes. But because type 2 diabetes can affect many parts of the body, testing for other health risks is just as crucial.

Dr. Wilson recommends that people who have type 2 diabetes start screening for complications as soon as they’re diagnosed — even though that may seem premature. “Most likely, there’s already been a period of time during which blood glucose was higher than the expected range,” Dr. Wilson says. Testing to detect any emerging issues can help you and your care team “get on the front end of it.”

The ADA’s current recommendations for people with type 2 diabetes include guidance for the following areas:

Heart and blood vessel health

People who have type 2 diabetes often have a higher risk of cardiovascular disease. The ADA recommends getting your blood pressure measured during every routine clinical visit, or at least once every six months. A lipid panel, which measures your cholesterol and triglycerides, is another important test for heart health. The ADA recommends getting a lipid panel when you’re diagnosed and at least once every year after.

Kidney health

Kidney disease also is common among people who have type 2 diabetes. The ADA recommends testing your urine albumin-creatinine ratio (uACR) and estimated glomerular filtration rate (eGFR) to check your kidney health at least once a year.

Nerve health and peripheral neuropathy

High blood glucose can cause nervous system issues. The ADA recommends an assessment for peripheral neuropathy by a healthcare professional after you’re diagnosed with type 2 diabetes and once every year after.

Eye and sight health

To monitor any vision issues, the ADA recommends having a dilated and comprehensive eye examination by an eye doctor after you’re diagnosed. Getting checked once every year helps your care team catch emerging issues.

Foot health

The ADA recommends an annual foot health examination. If you have a high risk of foot issues, a foot doctor might be able to offer specialized care.

https://mcpress.mayoclinic.org/diabetes/type-2-diabetes-monitoring-blood-sugar-tests-and-health-screenings/

The Value of a Prediabetes Diagnosis

From publichealth.jhu.edu

Screening for mildly elevated blood sugar levels can help prevent the progression to type 2 diabetes and related complications 

Is prediabetes a “real” clinical condition? It’s a matter of some debate among experts and doctors.

Even when it is recognized by clinicians, there is still disagreement about the criteria for diagnosis. But identifying prediabetes—a condition characterized by elevated blood sugar levels—opens an opportunity to prevent the progression to type 2 diabetes.

In a Q&A adapted from the April 2 episode of Public Health On Call, Elizabeth Selvin, PhD ’04, MPH, a professor in Epidemiology, unpacks the controversy around prediabetes and the value of lifestyle interventions in preventing diabetes and related health complications.

What is prediabetes?

Prediabetes is a term we use for individuals who are below the threshold for a diagnosis of type 2 diabetes but still have mildly elevated glucose levels and are thought to be at high risk for developing diabetes.

The entire concept of prediabetes is a bit controversial. There’s a lot of confusion about prediabetes, how to define it, and whether it is really a medical condition. I personally think prediabetes is real. I think it’s an important designation with important clinical relevance.

Why is a prediabetes diagnosis important to a patient’s health?

People diagnosed with prediabetes are at high risk for the development of diabetes and complications. From my perspective, prediabetes is an opportunity to identify people before the development of diabetes—it’s an opportunity to prevent weight gain, implement lifestyle interventions, and for people who are overweight or obese to lose weight.

A landmark randomized clinical trial called the Diabetes Prevention Program showed definitively that for people with elevated glucose, who are below the threshold for diabetes but likely to cross it, an intensive lifestyle intervention—weight loss, increased physical activity, and improved diet—prevents the progression to diabetes.

We also now have randomized clinical trials for pharmacologic therapies like GLP-1s, which are shown to prevent the progression from prediabetes to diabetes.

How is prediabetes diagnosed?

One of the problems in the field is that there are many definitions of prediabetes—there are five different definitions in current clinical use. That causes a lot of confusion because someone might have prediabetes by one definition but not by another.

Different organizations disagree on what’s best for defining prediabetes. Some measure fasting glucose; others measure hemoglobin A1C to assess hyperglycaemia. There is also a definition that measures two-hour glucose using a glucose tolerance test, which is not used much outside the setting of pregnancy.

The American Diabetes Association defines prediabetes as a fasting glucose of 100–125 milligrams per decilitre. A lot of people fall into that category. The WHO defines prediabetes as a fasting glucose of 110–125, so that’s a smaller group. Another definition uses haemoglobin A1C—usually an A1C of 5.7 to less than 6.5, while an international expert committee has said we should define prediabetes a little bit higher: from 6.0 to 6.4.

One of the key issues is that these definitions identify different people. If you’re using fasting glucose, you’ll get a different group of people. You can be prediabetic by the fasting glucose definition, but not by the A1C definition. I think that’s what causes a lot of confusion in the field.

Which definition do you recommend?

I’m an epidemiologist, so I say it depends. One nice thing about using A1C for diagnosing prediabetes or identifying people with prediabetes is that it’s a non-fasting test. That can really help in the context of screening and diagnosis: You don’t have to prepare for the clinic visit, and it doesn’t matter what you’ve eaten that day.

What does haemoglobin A1C measure?

It’s essentially a weighted average of elevations in glucose from the past two to three months. It gives a sense of chronic hyperglycaemia, or chronically elevated glucose. It’s a pretty stable test: Your haemoglobin A1C at one time is likely to be the same or very similar to your haemoglobin A1C measured at another time.

If your A1C is in the prediabetic range—or especially in the diabetic range—that means you’ve been having hyperglycaemia for a while and suggests that you’re potentially at high risk for developing diabetes.

Work from our group and many other groups has shown that people who have A1C in the prediabetic range are at an elevated risk for developing diabetes and complications from diabetes. Things like heart disease, kidney disease, and even overall mortality are elevated in people who have mildly elevated haemoglobin A1C. We know it’s a high-risk group, which is one reason I’m a big fan of haemoglobin A1C-based definitions.

What lifestyle changes should those with elevated haemoglobin A1C consider?

Diet, weight loss, and exercise can be helpful in slowing and preventing the progression to diabetes as people age. There’s very good evidence that modest weight loss—even 5% of body weight—can be effective and powerful for preventing progression to diabetes. One thing that gets lost in the discussion about weight loss is the prevention of weight gain. People tend to gain weight as they get older, so just preventing weight gain in the first place can be really important. [You can incorporate] modest lifestyle changes like eating a healthier diet and exercising—strength training and resistance training are really good for your muscles and help glucose metabolism.

https://publichealth.jhu.edu/2026/prediabetes-diagnoses-can-help-build-healthier-lifestyles

You asked, we answered: Can you lower your A1C without medication?

From nebraskamed.com/health

Question:  

I've heard that you shouldn't lower your A1C below 6% using diabetes medications because it can cause other health risks and possibly low blood sugar (known as hypoglycaemia). Is diet the best way to get off diabetic drugs? 

Answer from Nebraska Medicine endocrinologist Gunjan Arora, MD, MBBS: 

Your A1C is a blood test that shows your average blood sugar level over the past three months. It’s one of the most important numbers your doctor uses to check how well your diabetes is being managed.

What is a good A1C goal?

There isn’t one perfect A1C goal for everyone. Your ideal number depends on things like your age, other medical conditions, your risk for low blood sugar and your overall health.

For most adults with diabetes, the American Diabetes Association recommends an A1C below 7%, as long as it can be done safely without causing low blood sugar. Some people might aim for a lower number, and some might aim for a higher one. Your doctor will help you decide what’s right for you.

Is an A1C of 6% safe?

For some people, aiming for an A1C as low as 6% may not be helpful. Studies show that very strict control with medications doesn’t always prevent complications and may even increase the risk of low blood sugar or other side effects.

Whether a 6% goal is right for you is something you and your doctor should decide together based on your full health history.

Can you reach a low A1C through diet alone?

Once you and your doctor decide on a target A1C, there are several ways to reach it:

• Lifestyle changes (like healthy eating and regular physical activity)

• Oral medications

• Injectable medications

• Insulin

If your doctor says it’s safe and appropriate, some people can lower their A1C to around 6% through diet and lifestyle alone. However, lowering your A1C below 6% with diabetes medications is usually not recommended because of the risk of dangerous low blood sugar episodes.

The bottom line

Whether you should aim for an A1C of 6% — and whether you should do so with or without diabetes medication — depends on your personal health needs. It’s a decision best made with your doctor.

https://www.nebraskamed.com/health/questions-and-answers/diabetes/you-asked-we-answered-can-you-lower-your-a1c-without 

How Often Do You Need to Check Your Blood Sugar?

From everydayhealth.com/diabetes

Blood sugar checks are essential for the diagnosis and treatment of every form of diabetes. 

“Glucose monitoring is critical for preventing short-term and long-term complications of diabetes,” says Jessica Pius-Nwagwu, RN, an associate director of dissemination and implementation for the American Diabetes Association. “It provides real-time feedback on glucose fluctuations, identifies low and high glucose levels both with risks, and informs medical adjustments.”

There is no single recommendation for blood sugar monitoring that applies to everyone with diabetes. How often you should check your blood sugar varies according to your condition, the medications you use, and other health factors.

Types of Blood Sugar Measurements

There’s more than one way to measure your blood sugar.

Blood Sugar Meter or Continuous Glucose Monitor (CGM)

A blood sugar meter reveals your blood sugar level at the moment the test is taken.

Most people with diabetes are first taught how to measure their blood sugar with a blood sugar meter. You draw a drop of blood, insert it into a “fingerstick,” and receive the device’s reading of your blood sugar level at that moment. Depending on your diabetes management status, you may be advised to use a blood sugar meter multiple times a day, only once a day, or even less frequently.

For many people with type 2 diabetes, the most important time to use a blood sugar meter is first thing in the morning. This is known as a fasting blood sugar test, as it measures blood sugar after you have not eaten or drunk anything but water for at least the past eight hours. This can provide an important baseline of your blood sugar at its lowest level, unaffected by food, drink, exercise, and other daily habits.

Doctors may encourage others, especially those who use insulin to manage their type 1 or type 2 diabetes, to test their blood sugar multiple times throughout the day, including before and after meals and exercise. These checks can show how food and lifestyle choices affect diabetes management and can help determine how much insulin they need and how often.

A continuous glucose monitor (CGM) is a newer wearable device that sends blood sugar measurements to a smartphone or digital receiver around the clock, and it can sound alarms when blood sugar gets dangerously high or low. This can make it an important tool for people with type 1 or type 2 diabetes who want or need to track how and when their blood sugar rises and falls, though not all insurance plans cover CGMs.

Marilyn Tan, MD, a clinical associate professor of medicine specializing in endocrinology, gerontology, and metabolism at Stanford University in California, explains that CGMs measure changes in the interstitial fluid that contains blood sugar, rather than blood sugar itself.

“So readings may lag and may be less accurate at extremes of glucose [levels],” Dr. Tan says.

A1C Test

A haemoglobin A1C test measures your average blood sugar levels over three months. It does not give instant feedback on your diabetes management decisions. But your doctor may use it to diagnose prediabetes, type 1 diabetes, or type 2 diabetes or to determine how your diabetes treatment is progressing.

Your doctor may want you to have an A1C test as often as every three months, though people with more stable blood sugar control may need a check only once or twice a year.

Typically, a doctor administers an A1C via a blood draw or finger prick, with a sample sent to a lab to process results. Over-the-counter, at-home A1C tests are available. Ask your doctor if they are appropriate for your situation.

Type 2 Diabetes Without Insulin

If you are among the people with type 2 diabetes who do not need insulin to manage their condition, you might not need to check your blood sugar as often as people on insulin. But self-monitoring may be beneficial.

Pius-Nwagwu says that people with type 2 diabetes not on insulin should do a fasting blood sugar test daily, in addition to an A1C test that usually occurs quarterly. She adds that you should check with your doctor about the best frequency for your situation.

Tan says that frequency may depend on factors that include:

• How controlled your diabetes is
• Medications such as sulfonylureas that lower blood sugar
• Availability of test strips

She adds that checking blood sugar after meals may be helpful if you have type 2 diabetes without using insulin, but random blood sugar checks otherwise are usually unnecessary.

Although CGMs are not part of the usual standard of care for people who do not use insulin, research also suggests that they can help monitor blood sugar levels.

Type 2 Diabetes With Insulin

If your type 2 diabetes treatment requires insulin, your doctor may tell you to test your blood sugar several times a day. This is in part to avoid the threat of low blood sugar (hypoglycaemia), a potentially dangerous side effect of insulin use.

According to the American Diabetes Association, you may need to do as many as 6 to 10 daily checks, including:

• Before meals
• • Before bed
  • Occasionally after meals
  • Before, during, and after exercise
  • When you suspect low blood sugar
  • After treating low blood sugar
  • Before and during critical tasks, such as driving
  If you take a long-lasting basal insulin only once daily, you may require fewer checks than someone who also takes insulin at mealtimes.

  “Typically, someone on multiple daily injections of insulin (basal bolus) needs closer monitoring than someone on once-daily, long-acting insulin,” Tan says, “especially given that there are multiple opportunities to adjust dosing throughout the day and also more opportunities to overdose or underdose on insulin.”

  Tan says that people with insulin-dependent type 2 diabetes should do daily fasting blood sugar checks, with additional random blood sugar checks if unusual symptoms occur. Fasting blood sugar monitoring can help you adjust doses of basal insulin and ultimately lower your blood sugar levels.

  If you have type 2 diabetes and are on insulin, Pius-Nwagwu recommends testing A1C at least twice a year and quarterly if you are not meeting your A1C goals, regardless of the type of insulin. 

• CGMs also can help, Tan says. Evidence suggests that people with type 2 diabetes who are on insulin benefit from CGM use by increasing control over blood sugar and lowering hypoglycaemia risk.

  “Even once-daily, long-acting insulin can lead to hypoglycaemia, so all of these patients can benefit from a CGM,” she says.  

  Prediabetes or Family History of Diabetes

  If you have prediabetes or a family history of diabetes, you may be at risk for diabetes and benefit from blood sugar monitoring.

  Prediabetes means your blood sugar is elevated slightly, and your condition may progress to type 2 diabetes. If you have prediabetes, your doctor may want you to take an A1C test every one to two years, or more often, to monitor your potential progression toward full-blown diabetes.

  “For those with established prediabetes, an A1C test every three to six months is reasonable,” says Tan, who adds that the frequency depends on how close test results are to type 2 diabetes.

  If you have a family history of type 2 diabetes, the American Diabetes Association recommends A1C testing for screening and potential diagnosis. If your family history includes type 1 diabetes, it also recommends screening for type 1 diabetes autoantibodies.

  Although people without diabetes have used CGMs to monitor their blood sugar levels, there is little or no research showing that the devices benefit people with prediabetes. But some experts have argued that CGMs could help with diabetes prevention.
  Type 1 Diabetes

  Blood sugar checks are critical for people with type 1 diabetes, which requires insulin treatment. People with type 1 diabetes generally have to use insulin before every meal, frequently adjusting their doses based on their food, their physical activity level, and many other factors. It is extremely difficult to dose insulin accurately if you don’t know what your blood sugar level is.

  The American Diabetes Association also recommends 6 to 10 blood sugar tests daily for people with type 1 diabetes, including before and after meals, before bed, during exercise and critical tasks, and during times of high and low blood sugar levels.

  Given a nearly constant need for accurate blood sugar measurements and an enhanced risk of hypoglycaemia, the American Diabetes Association recommends that people with type 1 diabetes use CGMs.

  As for A1C tests, Osagie Ebekozien, MD, MPH, the chief quality officer at the American Diabetes Association, says people with type 1 diabetes should get them quarterly, though the association’s guidelines say controlled type 1 diabetes may require only two tests a year.
  

  Can You Test Your Blood Sugar Too Often?

  As a general rule, data on blood sugar is a good thing when it comes to diabetes management.

  “For healthcare providers, more data is helpful,” says Tan, adding that more tests can guide treatment decisions and monitor blood sugar fluctuations.

  Blood sugar monitoring, however, can contribute to diabetes burnout and feeling overwhelmed. Costs of testing devices can add up, and finger pricks can be painful.

  When in doubt, check with your doctor or endocrinologist about how much you need to monitor your blood sugar for your situation. Mental health support can also help you deal with difficult emotions related to diabetes care.

  The Takeaway

  • Routine blood sugar monitoring is a vital part of diabetes management and can prevent complications.
  • Testing options include fingerprick tests, continuous glucose monitoring (CGM), and A1C tests that measure longer-term averages.
  • If your type 1 or type 2 diabetes requires insulin treatment, you may require as many as 10 blood sugar tests each day, and could benefit from even more by using a CGM.
  • Always talk to your doctor about which blood sugar monitoring plans will work best for your specific condition.

  https://www.everydayhealth.com/diabetes/how-often-do-you-need-to-check-your-blood-sugar/