Diabetes: Tests You Need and Why
Diabetes is a condition that can affect your whole body. When your blood glucose stays
too high for too long, it can lead to problems with your heart, blood vessels, eyes,
nerves, and kidneys. By getting regular tests and checkups, you can help control your
glucose level and prevent or delay damage caused by high blood glucose. Watching your
health closely lets you react to problems early before they get more serious.
Here’s a list of several diabetes-related tests and checkups, as well as guidelines
for how often each one is needed. Keep in mind that you may need more frequent testing
or checkups if you have signs of problems. Your healthcare provider can suggest the
best schedule for you.
This blood test shows the average amount of glucose in your blood during the past
2 to 3 months. The results indicate how well your blood glucose is controlled and
whether your treatment plan needs any changes. The A1C target for many people is less
than 7%, but this target may vary depending on your age, duration of diabetes, and
other risk factors.
How often: At least 2 times a year if you are at your goal with stable glycemia; more
often in people whose therapy has changed or who are not meeting glycemic goals.
Blood lipids test
This blood test checks for several types of fat in your blood. LDL (“bad”) cholesterol
can narrow or block blood vessels. This can possibly lead to a heart attack or stroke—big
problems for people with diabetes. Most people with diabetes will be advised to take
statin medicines to lower cholesterol levels. Your total cholesterol should be lower
than 200 mg/dl, and your LDL level should be lower than 100 mg/dl. If you have both
diabetes and cardiovascular disease, your LDL level should be lower than 70 mg/dl.
Triglycerides are another type of harmful fat that raise your risk for heart attack
and stroke. Aim for a triglyceride level lower than 150 mg/dl. HDL (“good”) cholesterol
helps keep your blood vessels healthy. Your HDL level should be higher than 40 mg/dl
for men or higher than 50 mg/dl for women.
How often: At least once a year
Blood pressure test
Controlling your blood pressure helps prevent heart, blood vessel, eye, and kidney
problems. The target for adults with diabetes is a blood pressure reading lower than
130/80 mm Hg. Both numbers matter. The first one is the pressure as your heart beats
and pushes blood into your blood vessels. The second one is the pressure as your heart
rests between beats.
How often: At every healthcare provider visit
Having diabetes puts you at increased risk for tooth and gum problems. As a result,
it’s especially important to have your teeth cleaned and checked at your dentist’s
office on a regular basis.
How often: At least twice a year
Dilated eye exam
High blood glucose and high blood pressure can harm the eyes. In a dilated eye exam,
an eye care provider puts drops in your eyes to temporarily enlarge your pupils. This
makes it easier for the provider to look inside your eyes for signs of damage.
How often: Once a year by licensed ophthalmologist or optometrist
Nerve damage, poor blood flow, and infections resulting from diabetes can cause foot
problems. Nerve damage can lead to a loss of feeling in the feet or cause ulcers to
develop. Poor circulation can mean that sores or infections heal slowly. If these
problems aren’t treated promptly, they can lead to serious infection or amputation.
At every healthcare provider visit, have your feet checked for sores. In addition,
you should have a more comprehensive foot exam so that your provider can check the
sense of feeling and circulation in your feet.
How often: Once a year for the comprehensive exam
Kidney function tests
Diabetes can damage the kidneys and eventually cause kidney failure. Various tests
can help find kidney problems before they become severe. One test checks for a protein
called microalbumin in the urine, an early sign of kidney disease. Another test checks
for creatinine in the blood, a waste product that builds up when the kidneys aren’t
How often: Once a year