You can check your blood sugar at home using a small handheld device called a glucose meter (glucometer) and disposable test strips. The process takes under a minute: you prick your finger, apply a drop of blood to a test strip, and the meter displays your glucose level within seconds. For people who want continuous tracking without finger pricks, wearable sensors called continuous glucose monitors are another option.
What You Need to Get Started
A basic blood glucose testing kit includes a meter, a supply of test strips, a lancing device (a spring-loaded tool that holds a tiny needle), and lancets. You can buy these at most pharmacies without a prescription, though your insurance may cover them if you have a diabetes diagnosis. Test strips are the ongoing cost, and they need to match your specific meter model.
Store your test strips in their sealed container at room temperature. Humidity, heat, and cold all degrade them, and expired or damaged strips give unreliable readings.
How to Test With a Finger Prick
The CDC recommends the following steps each time you test:
- Make sure your meter is charged and ready.
- Wash your hands with soap and warm water, then dry them completely. Don’t use hand sanitizer, as residue on your skin can throw off results.
- Massage or shake your hand to increase blood flow to your fingertip.
- Use the lancing device to prick the side of your fingertip (less sensitive than the pad).
- Squeeze gently from the base of the finger to form a generous drop of blood, then touch it to the test strip.
- Insert the strip into the meter if you haven’t already. Within a few seconds, your reading appears on the screen.
- Record the result, along with any notes about meals, exercise, or how you’re feeling.
- Drop the used lancet and strip into a sharps container or a heavy-duty plastic household container like a laundry detergent bottle. Never toss loose lancets into regular trash or recycling bins. Exposed sharps can spread hepatitis B, hepatitis C, and HIV.
What Affects Your Reading’s Accuracy
A glucose meter is only as reliable as the conditions you test under. Several common factors can skew your results, sometimes enough to change a treatment decision.
Dirty or damp hands are the most frequent culprit. Even a trace of sugar from food on your fingertip can produce a falsely high number. If you used an alcohol wipe instead of soap and water, let the site dry completely before pricking. Too little blood on the strip also causes inaccurate readings, so make sure you’re applying a full drop rather than a smear.
Dehydration and anemia (a low red blood cell count) affect accuracy at the biological level, so keep that in mind if you’re sick or haven’t been drinking enough fluids. And if a reading doesn’t match how you feel, test again with a fresh strip. Meters have a margin of error, and a second test can confirm whether the first was off.
Testing From Sites Other Than Your Fingertip
Some meters allow you to draw blood from your forearm, upper arm, base of the thumb, or thigh. These alternative sites can be less painful, but they come with an important tradeoff: readings from non-fingertip sites lag behind your actual blood sugar when levels are changing quickly, such as after a meal, after taking insulin, or during exercise.
Stick with your fingertip if you suspect low blood sugar, if you don’t usually notice symptoms of low blood sugar, or if the alternative-site result doesn’t match how you feel. Not every meter supports alternative sites, so check your device’s instructions before trying one.
Continuous Glucose Monitors
A continuous glucose monitor (CGM) is a small wearable sensor, typically applied to the back of your upper arm or your abdomen, that measures glucose in the fluid just beneath your skin every few minutes. It sends data wirelessly via Bluetooth to a smartphone app or a dedicated receiver, giving you a real-time trend line instead of isolated snapshots.
Most CGM sensors are applied at home with a simple adhesive applicator that pushes a tiny filament under the skin. The process takes seconds and is far less painful than it sounds. Depending on the model, sensors last 10 to 14 days before needing replacement. One implantable version, the Eversense, is placed under the skin by a healthcare provider and lasts up to 90 days, with a removable transmitter worn on top that also delivers vibration alerts when your glucose hits preset thresholds.
CGMs are particularly useful for people with type 1 diabetes or anyone on insulin, because they reveal patterns that finger-prick testing misses: overnight dips, post-meal spikes, and the speed at which glucose is rising or falling. Some models no longer require finger-prick calibration, though it’s still good practice to confirm an unexpected CGM reading with a fingertip test.
How Often to Test
Testing frequency depends on your type of diabetes and treatment plan. People with type 1 diabetes typically test 4 to 10 times a day, or use a CGM for continuous tracking. If you have type 2 diabetes and take multiple daily insulin injections, testing before meals and at bedtime is common. If you’re on a single long-acting insulin dose, testing before breakfast and occasionally before dinner or bedtime may be enough.
If you manage type 2 diabetes with non-insulin medications, diet, or exercise alone, you may not need daily testing at all. Your provider can help you find a schedule that gives useful information without unnecessary finger pricks. Regardless of frequency, the most valuable tests are the ones you actually log and review for patterns.
Home A1C Test Kits
While a glucose meter tells you what your blood sugar is right now, an A1C test estimates your average blood sugar over the past two to three months. Home A1C kits are available over the counter and use a finger-prick blood sample mailed to a lab or analyzed with a small device.
Accuracy varies significantly by brand. A University of Florida study of 219 people with diabetes found that one kit (Home Access) had 82% of samples within the accepted accuracy benchmark of 5% compared to a standard lab draw. Two other kits fell well short, with only 46% and 29% of samples meeting that same standard. A home A1C kit can give you a rough sense of your trend between doctor visits, but it’s not a substitute for a lab test when precision matters.
Getting the Most From Your Results
A single blood sugar number in isolation doesn’t tell you much. The real value comes from tracking readings over time and noting what influences them. Write down (or use your meter’s app to log) what you ate, when you exercised, how you slept, and whether you were stressed or ill. After a week or two, patterns emerge: maybe your fasting numbers are consistently high, or you spike after certain meals but not others.
Bring your log to appointments. A provider can adjust your treatment plan based on real data far more effectively than based on a single lab draw every few months. If your meter connects to an app, many of them generate reports you can share directly.