You can check your A1C at home using an over-the-counter test kit that requires a small finger-prick blood sample. These kits are available at major pharmacies without a prescription, typically cost around $50, and deliver results in about five minutes. The process is straightforward, but understanding what affects accuracy and how to interpret your number makes the difference between useful information and a misleading result.
What Home A1C Kits Are Available
The FDA has cleared a small number of A1C test kits for home use. The main options you’ll find on pharmacy shelves include the Walgreens At Home A1C Test Kit (around $49.99), the TRUE+ A1C Now Self Check, and the ReliOn Fast A1C Test (sold at Walmart). All of these use the same basic technology: a small handheld analyzer that reads your blood sample and displays a percentage on screen.
These kits are single-use, so each box gets you one test. If you’re testing every three to six months, expect to spend $100 to $200 per year.
How to Take the Test
Each kit comes with a lancet for pricking your finger, a blood collector, and a small analyzer device. The general process works like this:
- Wash your hands with warm water. This improves blood flow and removes anything on your skin that could contaminate the sample.
- Prepare the analyzer by following the kit’s setup instructions, which usually involves inserting a test cartridge or shaker pouch.
- Prick the side of your fingertip with the included lancet. Squeeze gently until you get a hanging drop of blood.
- Apply the blood to the collector and insert it into the analyzer within two minutes. Waiting longer can affect the result.
- Leave the device on a flat surface and don’t move or pick it up until it finishes processing.
- Write down your result immediately. Most devices won’t save the reading after about 15 minutes, so record it before the screen turns off.
The whole process takes roughly five to ten minutes from start to finish.
How Accurate Are Home Tests?
Home A1C kits are less precise than laboratory tests, and it’s worth knowing by how much. A 2017 analysis published in Diabetes Care reviewed 61 studies comparing 13 point-of-care A1C devices to laboratory assays. Every single device showed some degree of bias. Nine of the 13 tended to read lower than the lab result, while four read higher. In follow-up evaluations, roughly half of the devices tested failed to meet the accuracy standards set by the National Glycohemoglobin Standardization Program.
What this means in practice: a home test reading of 6.8% might actually be anywhere from about 6.1% to 7.5% in a lab. That range matters when you’re near a diagnostic cutoff. Home kits are useful for tracking trends over time (is your number going up, down, or holding steady?), but a single result shouldn’t be treated as a precise clinical measurement.
What Your Results Mean
A1C measures your average blood sugar over the previous two to three months, expressed as a percentage. The standard ranges, according to the National Institute of Diabetes and Digestive and Kidney Diseases, are:
- Below 5.7%: Normal
- 5.7% to 6.4%: Prediabetes
- 6.5% or above: Diabetes
If you already have diabetes, most treatment plans aim to keep your A1C below 7%, though your personal target may differ. A result of 8% or higher generally signals that blood sugar management needs adjustment.
Keep in mind that your home result is a starting point, not a diagnosis. If your number falls in the prediabetes or diabetes range for the first time, a lab-confirmed test is the next step.
Conditions That Skew A1C Results
Certain health conditions can make your A1C reading misleadingly high or low, regardless of whether you test at home or in a lab.
Iron deficiency, vitamin B12 deficiency, and folate deficiency all tend to push A1C readings artificially higher. This happens because these anemias slow the turnover of red blood cells, giving sugar more time to attach to them. On the other hand, conditions that destroy red blood cells faster than normal, like hemolytic anemia, chronic blood loss, or an enlarged spleen, tend to produce falsely low readings. Pregnancy also tends to lower A1C results.
Hemoglobin variants, which are more common in people of African, Mediterranean, or Southeast Asian descent, can cause A1C to read either high or low depending on the specific testing method. If you carry a known hemoglobin trait like sickle cell trait, A1C may not reliably reflect your actual blood sugar average. In these cases, your doctor may use a different test called fructosamine or rely more heavily on daily glucose monitoring.
How Often to Test
If you have diabetes and your blood sugar is still fluctuating or you’ve recently changed medications or lifestyle habits, testing every three months gives you a useful check-in. Once your numbers have stabilized and you’re consistently hitting your target, every six months is generally sufficient.
For people with prediabetes who are making dietary or exercise changes, testing every three to six months can help you see whether those changes are moving the needle. There’s no benefit to testing more frequently than every three months, since A1C reflects a two-to-three-month average. Testing sooner just recaptures the same time window.
Exceptions where more frequent testing makes sense include children and adolescents with type 1 diabetes, anyone planning a pregnancy, and people whose blood sugar levels are shifting rapidly due to major medication or lifestyle changes.
Home Testing vs. Lab Testing
Home kits fill a specific role: convenience between lab visits. They let you spot trends without scheduling an appointment, and they’re especially helpful if you’ve recently changed your diet, started exercising more, or adjusted a medication and want a rough check on progress.
They don’t replace lab testing. Lab A1C is drawn from a vein, processed with high-precision instruments, and is the standard used for diagnosis and treatment decisions. If your home result surprises you in either direction, a lab draw will clarify whether the number is real. Most people with diabetes benefit from at least one lab-confirmed A1C per year, with home tests filling the gaps between visits.