A blood glucose meter checks glucose in a small finger-stick blood sample at one point in time. Wash and dry your hands, use a new authorized test strip, apply the sample as your meter’s instructions direct, and record the result. A clinician can help decide whether home monitoring is useful and when to check.
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See if you qualify →How can I check my blood sugar at home?
The usual home method is a blood glucose meter, also called a glucometer or blood glucose monitoring device. It uses a capillary finger-stick blood sample and a test strip to estimate the amount of glucose, or blood sugar, in your blood at that time. 1
What a home blood glucose meter measures
Glucose is a sugar your body uses for energy. A meter system includes a handheld reader and test strips that react with a small blood sample. The displayed number is useful for spotting patterns over time, but it is not identical to a laboratory blood test and should be read in context. 1
People with diabetes may use home results with their care team to understand how meals, movement, illness, and prescribed medicines affect glucose. Monitoring plans vary widely, so the timing of each test should come from an individual care plan rather than a general online schedule. 1
What do I need to check blood sugar with a meter?
You need a meter system whose pieces work together: the meter, compatible test strips, a lancing device, and new lancets. Read the instructions for your exact model before your first test, since the order of steps and strip handling can differ by device. 1
- A blood glucose meter (glucometer).
- Test strips made for that specific meter model.
- A lancing device and a new single-use lancet.
- Soap, water, and a clean towel or tissue for handwashing and drying.
- A sharps container or other disposal option that follows local guidance.
- A paper log, phone note, or meter app to record results.
Why should I use authorized, unexpired test strips?
Test strips are part of the measuring system, not an interchangeable accessory. Using strips that are not compatible with the meter, are expired, have been damaged, or were stored outside the instructions can make results less reliable. FDA guidance notes that strip quality, storage, and user technique can affect blood glucose testing. 1
What are the steps for using a blood glucose meter?
For most systems, the basic process is simple: prepare the meter, make a small finger-stick, apply blood to a strip, and record the displayed number. Follow the instructions for your device if they differ from these general steps. 1
- 1Wash your hands with soap and water, then dry them completely. Do not test through food, lotion, or moisture on your skin. 1
- 2Check that you have the correct, unexpired strip. Insert it into the meter if your system requires this before sampling. 1
- 3Place a new lancet in the lancing device. Use the side of a fingertip rather than the center if your device instructions allow it.
- 4Use the lancet to obtain a small drop of blood. Apply it to the strip exactly as the instructions direct; do not smear blood across the strip unless your device specifically says to do so. 1
- 5Wait for the result. Record the number, date, time, and whether it was before or after food, exercise, or medicine.
- 6Discard the used lancet and strip safely. Do not reuse or share lancets, lancing devices, meters, or other equipment exposed to blood. 1
Why wash and dry your hands before testing?
Residue from fruit, candy, drinks, lotion, or other substances on your fingers can affect the sample. Wet hands can also dilute blood. Washing with soap and water and drying well is a practical way to reduce avoidable errors. 1
How should I record a result?
A simple written log can turn isolated numbers into useful patterns. Include the reading and what was happening around it. Most meters also store results, and some can connect to an app. 1
| What to record | Example |
|---|---|
| Date and time | Tuesday, 7:15 a.m. |
| Glucose result | Meter result and unit shown by your device |
| Timing | Before breakfast; two hours after lunch; during symptoms |
| Food, activity, or illness | Missed meal, walk, fever, vomiting, or unusual stress |
| Symptoms | Shaky, sweaty, thirsty, blurry vision, or no symptoms |
| Medicines | Only note relevant prescribed medicine timing; do not change doses based on a log without clinician guidance. |
Can I check blood sugar without a finger-stick meter?
A continuous glucose monitor, or CGM, is another validated way to follow glucose trends. It uses a small sensor under the skin to measure glucose in interstitial fluid, the fluid around cells, rather than directly measuring a finger-stick blood sample. 5
How does a continuous glucose monitor differ from a meter?
A CGM can show trends and repeated readings over time, while a meter gives a single reading from a blood sample. Because the two methods measure glucose in different body fluids, values may not match exactly, especially when glucose is changing quickly. Device instructions explain when a finger-stick confirmation may be needed. 5
Can symptoms, urine tests, or wellness devices replace a glucose measurement?
No. Symptoms such as shakiness, thirst, fatigue, or blurred vision can have many causes. Urine testing and nonvalidated wellness devices cannot replace a properly used blood glucose meter or CGM when you need an actual glucose measurement. For an overview of monitoring options, see our guide to blood sugar monitoring systems. 1
What can make a home blood sugar reading less accurate?
Home meters are designed for lay users, but no test is perfect. FDA clearance reviews how a system performs against a comparator method and whether intended users can operate it using the instructions for use. 2
The biggest controllable factors are clean, dry hands and correct use of the meter’s own strips. If a result does not fit how you feel or differs sharply from your usual pattern, repeat the check according to your device instructions and contact a clinician when appropriate. 1
- Hand contamination from food, drinks, lotion, or other substances. 1
- Wet hands or too little blood on the strip. 1
- Expired, damaged, incompatible, or poorly stored strips. 1
- Not following the device’s temperature, cleaning, coding, or quality-control instructions. 1
- Dehydration, anemia, or an unusual hematocrit, meaning the proportion of red blood cells in blood. 1
- Certain medicines or supplements, including products containing acetaminophen or high-dose vitamin C when listed in a device’s instructions for use. Check your meter documentation or ask a pharmacist. 1
- Using an alternate body site when glucose may be changing quickly. Finger-stick samples may be more dependable in that situation. 1
When and how often should I check my blood sugar?
There is no one right testing schedule for everyone. The right plan depends on whether you have diabetes mellitus, pregnancy, symptoms of hypoglycemia or hyperglycemia, prescribed medicines, and the goals set with your clinician. 1
For people who have a monitoring plan, tracking readings at the same agreed times can make patterns easier to see. Your clinician may use that record to discuss food, activity, and medication decisions; do not independently change insulin or other diabetes medicines based on a single home result. 1
What does a blood sugar result mean?
A result only makes sense alongside the timing of the test, your symptoms, your medical history, and your clinician-set target range. A single meter result cannot diagnose diabetes, prediabetes, hypoglycemia, or hyperglycemia on its own. 1
If you are trying to understand ranges, start with our guide to what a normal blood sugar level means. A clinician may use laboratory testing, including tests that reflect glucose over time, when evaluating possible diabetes. 1
When does a result need prompt medical attention?
Follow the urgent instructions already included in your diabetes care plan, if you have one. Seek urgent medical care for severe or rapidly worsening symptoms, such as confusion, fainting, seizure, trouble breathing, chest pain, repeated vomiting, or inability to keep fluids down. Call 911 for an emergency. For more context on warning signs, see signs of high blood sugar and dangerous blood sugar levels. 1
When should I talk with a clinician about blood sugar monitoring?
Talk with a clinician if you have recurring symptoms, repeated unexpected readings, questions about whether monitoring is appropriate, or trouble using a device. They can help choose a device, review technique, set personal targets, and decide whether laboratory testing is needed. 1
Chia does not provide blood glucose meters, CGMs, diabetes diagnosis, or diabetes-device monitoring services. This page is general education only; a primary-care clinician, endocrinology clinician, diabetes care team, pharmacist, or certified diabetes care and education specialist can help with device-specific guidance.
Possible signs can include increased thirst, frequent urination, fatigue, blurred vision, and headache. These symptoms are not specific to high blood sugar, so a validated glucose measurement and clinical guidance matter. 1
There is no single number that applies to every person or testing situation. Results vary by whether you ate recently, pregnancy status, diabetes history, prescribed treatment, and your clinician’s individual target range. 1
Symptoms and urine testing cannot give you a reliable blood glucose number. A validated blood glucose meter or continuous glucose monitor is needed to measure glucose. 1
Routine home testing is not necessary for everyone. Ask a clinician if you have symptoms, risk factors, pregnancy-related testing needs, or a reason to monitor. 1
Follow your meter’s instructions. Alternate-site testing may be less dependable when glucose is changing quickly, such as around meals, activity, or possible low blood sugar symptoms. 1
Use a new lancet for each test and never share lancets, lancing devices, meters, or other equipment exposed to blood. This reduces injury and bloodborne infection risk. 1
Wash and dry your hands, check the strip expiration date and storage, and repeat the test according to your meter instructions. If the result still does not fit your symptoms or usual pattern, contact a clinician or follow your existing diabetes care plan. 1
References
- 1.U.S. Food and Drug Administration. Blood Glucose Monitoring Devices. 2026.
- 2.Klonoff DC, Parkes JL, Kovatchev BP, et al. Meeting the New FDA Standard for Accuracy of Self-Monitoring Blood Glucose Test Systems Intended for Over-the-Counter Use. Journal of Diabetes Science and Technology. 2021.
- 3.U.S. Food and Drug Administration. Blood Glucose Monitoring Test Systems for Prescription Point-of-Care Use: Guidance for Industry and Food and Drug Administration Staff. 2020.
- 4.Klonoff DC, Parkes JL, Kovatchev BP, et al. Do the New FDA Guidance Documents Help Improving Performance of Blood Glucose Monitoring Systems? Journal of Diabetes Science and Technology. 2017.
- 5.Heinemann L, Freckmann G, Pleus S, et al. Minimum Requirements for Continuous Glucose Monitors. Journal of Diabetes Science and Technology. 2025.
- 6.Klonoff DC, Parkes JL, Kovatchev BP, et al. Do the New FDA Guidance Documents Help Improving Performance of Blood Glucose Monitoring Systems? Journal of Diabetes Science and Technology. 2018.
- 7.U.S. Food and Drug Administration. Blood Glucose Monitoring Devices: Home-use blood glucose monitoring information. 2026.
- 8.U.S. Food and Drug Administration. Self-Monitoring Blood Glucose Test Systems for Over-the-Counter Use: FDA performance guidance discussed in accuracy research. 2021.
About this article
Chia Health Editorial Team — Evidence-reviewed health education
This article is for educational purposes only and is not a substitute for individualized medical advice. Talk to a licensed clinician before starting, stopping, or changing any prescription.
AI tools may assist with research and drafting. Chia's editorial team reviews source use, clarity, treatment information, and safety framing before publication. A clinician is named only after explicit sign-off. Read our editorial standards.
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