Testing your blood sugar at home takes about 30 seconds once you have the right supplies. You prick your finger with a small lancet, touch a drop of blood to a test strip, and a portable meter displays your glucose level within seconds. Whether you’re newly diagnosed, managing diabetes long-term, or just curious about your levels, the process is straightforward once you understand the basics.
What You Need to Get Started
A basic blood glucose monitoring kit includes a meter, test strips, a lancing device, and lancets (the small, disposable needles that prick your skin). Most meters come bundled with a lancing device and a starter pack of strips and lancets. Test strips are the ongoing cost: prices range from about $0.15 per strip for budget brands like Prodigy to around $1.00 per strip for premium brands like OneTouch Ultra. Store brands from pharmacies typically fall in the $0.20 to $0.30 range.
Most commercial insurance plans, Medicare Part B, and Medicaid cover meters and test strips as durable medical equipment, but you’ll need a prescription. Many insurers designate “preferred” meter brands that cost significantly less out of pocket, so it’s worth checking your plan’s formulary before buying.
Step-by-Step Fingerstick Testing
The CDC recommends the following process:
- Wash your hands with soap and warm water, then dry them thoroughly. This is the single most important step for accuracy. Residue from food, lotion, or even fruit you recently handled can artificially raise your reading. Alcohol swabs are an alternative, but only if you let your finger dry completely before pricking it. Alcohol that hasn’t evaporated can denature the enzyme on the test strip and dilute the blood sample, skewing your result.
- Prepare the meter. Make sure it’s charged and insert a fresh test strip. Some meters require you to insert the strip first to turn on; others turn on separately.
- Massage or shake your hand to encourage blood flow into your fingernail. This makes it easier to get a usable drop.
- Lance the side of your fingertip. The side hurts less than the pad because it has fewer nerve endings. Rotate fingers between tests to avoid soreness in one spot.
- Squeeze gently from the base of the finger to form a small, round drop of blood. Don’t squeeze too hard, as this can mix tissue fluid into the sample and affect accuracy.
- Touch the blood to the test strip. Most modern strips use capillary action to wick the blood in automatically. You’ll see a confirmation on the meter screen.
- Read your result. The number appears within a few seconds.
What Your Numbers Mean
The American Diabetes Association’s 2025 guidelines set these targets for most nonpregnant adults with diabetes:
- Before meals (fasting or preprandial): 80 to 130 mg/dL
- One to two hours after a meal (postprandial): below 180 mg/dL
- A1C (a three-month average): below 7.0%
These targets are general. Your specific goals may be tighter or more relaxed depending on your age, how long you’ve had diabetes, and whether you have other health conditions. If your pre-meal readings look good but your A1C is still above target, checking one to two hours after eating can reveal post-meal spikes you’re missing. That one-to-two-hour window is when glucose typically peaks in people with diabetes.
When and How Often to Test
If you take insulin, regular fingerstick testing is essential. Many people on insulin test before each meal and at bedtime, which means four or more times a day. If you take oral medications or manage type 2 diabetes with lifestyle changes alone, your testing schedule will be less frequent and more tailored to your situation.
The ADA recommends checking your A1C at least twice a year if your glucose is stable and on target, and at least every three months if your treatment has recently changed or you’re not meeting your goals. Day-to-day fingerstick readings fill in the gaps between those lab tests by showing you how specific meals, activities, and medications affect your levels in real time.
A useful strategy called “paired testing” involves checking your glucose right before a meal and then again one to two hours afterward. This shows you exactly how that meal affected your blood sugar, giving you data you can actually act on.
Testing From Sites Other Than Your Finger
Some meters are approved for testing on the forearm, upper arm, base of the thumb, or thigh. These sites can be less painful than fingertips, but they come with an important tradeoff: blood flow to these areas is slower, so the glucose reading lags behind what’s actually happening in your bloodstream.
The FDA specifically advises sticking with fingertip testing if you think your blood sugar is low, if you don’t usually feel symptoms when it drops, if you’ve recently eaten, if you’ve just taken insulin, or if you’re exercising or feeling sick. In all of these situations, glucose levels change rapidly and alternative sites won’t keep up.
How Accurate Are Home Meters?
Home glucose meters are required to meet an international accuracy standard (ISO 15197). For readings at or above 75 mg/dL, results must fall within 20% of a laboratory value. For readings below 75 mg/dL, they must be within 15 mg/dL. In practice, studies of major meter brands show 97.7% to 100% of results meeting these thresholds.
The most common source of inaccurate readings isn’t the meter itself. It’s user error. Dirty hands are the top culprit: touching fruit, juice, or sugary food before testing can dramatically inflate your result. Expired or improperly stored test strips (heat and humidity degrade them) are another frequent cause. If a reading doesn’t match how you feel, wash your hands, use a fresh strip, and test again.
Continuous Glucose Monitors
A continuous glucose monitor, or CGM, is a small sensor worn on the skin (usually the back of the arm or abdomen) that automatically reads glucose levels every 5 to 15 minutes, including while you sleep. Unlike a fingerstick meter, which gives you a single snapshot, a CGM shows trends over time: whether your glucose is rising, falling, or holding steady.
CGMs measure glucose in interstitial fluid, the liquid between your cells, rather than in blood directly. Glucose moves from your bloodstream into interstitial fluid by diffusion, so CGM readings lag a few minutes behind fingerstick readings. This delay matters most when glucose is changing quickly, such as right after a meal or during exercise. Many CGM users still keep a fingerstick meter on hand to double-check readings that seem off or to calibrate their sensor.
Safe Disposal of Lancets and Strips
Used lancets are considered medical sharps and shouldn’t go loose in household trash. The FDA recommends placing them in a puncture-resistant sharps container immediately after use and filling it no more than three-quarters full. You can buy FDA-cleared sharps containers at most pharmacies, or use a heavy plastic container like a laundry detergent bottle with a screw-on lid.
When the container is ready to discard, disposal options vary by community. Common options include drop-off at pharmacies, hospitals, fire stations, or household hazardous waste sites. Mail-back programs are also available for a fee. Your local health department or trash removal service can tell you which options are available in your area.