You can test your A1C at home using an over-the-counter fingerstick kit available at most major pharmacies. These kits use a small drop of blood from your finger and deliver results in about five minutes, giving you a snapshot of your average blood sugar over the past two to three months.
How Home A1C Tests Work
Home A1C kits measure the same thing a lab test does: the percentage of your red blood cells that have sugar attached to them. Because red blood cells live about three months, this percentage reflects your average blood sugar over that window rather than a single moment in time.
Every kit on the market follows the same basic process. You wash your hands, prick your fingertip with the included lancet, and apply a drop of blood to a test strip or collection card. The device reads the sample and displays your A1C as a percentage. The whole process takes less than ten minutes from start to finish, with the actual result appearing in roughly five minutes.
Available Kits and What They Cost
Three FDA-cleared home A1C systems are widely sold in the U.S.:
- A1CNow Self Check (TRUE+), sold at many pharmacies and online retailers
- CVS At Home A1C Test Kit, available at CVS stores and cvs.com
- ReliOn Fast A1C Test, sold at Walmart
Prices typically range from $30 to $50 for a single-test kit, with multi-test packs sometimes available at a lower per-test cost. Insurance almost never covers these kits. Blue Cross Blue Shield of Michigan’s policy is representative: it classifies home A1C devices as “experimental/investigational” and does not cover them for commercial plans. Medicare explicitly does not pay for A1C testing performed by the patient at home. So expect to pay out of pocket.
Step-by-Step Testing Tips
Each brand includes its own instructions, but a few universal steps improve your results. Make sure the kit is at room temperature before you start, since extreme heat or cold can affect the chemistry. Wash your hands with warm water and soap, then dry them completely. Warm water helps blood flow to your fingertips, which makes it easier to get a sufficient drop from a single prick.
Prick the side of your fingertip rather than the pad. It hurts less and bleeds more freely. Let a full, round drop form before touching it to the test strip. Smearing or squeezing too hard can dilute the sample with tissue fluid, which may skew your reading. Once the sample is applied, set a timer if the kit doesn’t have one built in, and avoid touching or moving the device until the result appears.
How Accurate Are Home Kits?
Home kits are reasonably close to lab results, but not identical. Research comparing fingerstick blood to standard lab draws found strong correlations between the two, with concordance coefficients of 0.94 to 0.96 depending on the device. In practical terms, one study showed 100% agreement between fingerstick and lab values on one certified system, and 81% agreement on another. The difference between a home reading and a lab reading is usually small (a few tenths of a percentage point), but it’s real.
The American Diabetes Association puts it plainly: your health care team will rely on lab work, which is more accurate, for clinical decisions. Home kits give you general information about your blood sugar trends, not a number precise enough to fine-tune medication doses. Think of a home kit as a useful check-in between lab visits, not a replacement for them.
When Home Results Can Be Wrong
Certain health conditions can push your A1C reading higher or lower than your actual blood sugar warrants, regardless of whether you test at home or in a lab.
Iron deficiency anemia is one of the most common culprits. It slows red blood cell turnover, which causes sugar to accumulate on cells for longer than usual, producing a falsely high A1C. Vitamin B12 and folate deficiency anemias do the same thing. On the flip side, conditions that destroy red blood cells faster than normal, like hemolytic anemia or significant blood loss, produce falsely low readings because cells don’t survive long enough to collect sugar.
Kidney disease complicates things in both directions. Early-stage kidney disease can push A1C slightly higher, while end-stage kidney disease typically drives it lower because of the chronic anemia that accompanies it. Hemoglobin variants, particularly the homozygous forms found in sickle cell disease or hemoglobin C disease, can make A1C unreliable in either direction depending on the specific testing method used. If you carry a heterozygous trait (like sickle cell trait), A1C can still be meaningful, but only with certain assay types your doctor can verify.
If any of these conditions apply to you, a home A1C kit is unlikely to give you a number you can trust. Your doctor may use alternative measures of blood sugar control instead.
Reading Your Results
Your A1C result is a percentage, and translating it into an estimated average blood sugar makes it much easier to interpret. The conversion formula is straightforward: multiply your A1C by 28.7, then subtract 46.7. That gives you an estimated average glucose in mg/dL.
Here are the most common conversions:
- A1C 5%: average blood sugar around 97 mg/dL
- A1C 6%: around 126 mg/dL
- A1C 7%: around 154 mg/dL
- A1C 8%: around 183 mg/dL
- A1C 9%: around 212 mg/dL
- A1C 10%: around 240 mg/dL
A normal A1C is below 5.7%. Between 5.7% and 6.4% falls in the prediabetes range. An A1C of 6.5% or higher indicates diabetes. These thresholds were established using lab-grade testing, so if your home kit puts you near a boundary, a lab confirmation is worth getting before drawing conclusions.
How Often to Test
The American Diabetes Association recommends checking A1C at least twice a year if your blood sugar is well controlled and stable. If you’ve recently changed medications, adjusted your diet significantly, or aren’t meeting your blood sugar targets, testing every three months (quarterly) is more appropriate.
Home kits fit naturally into this schedule as a midpoint check. For example, if your doctor orders lab A1C every six months, a home test at the three-month mark can tell you whether your daily management is on track or drifting. Testing more frequently than every three months rarely adds useful information, since it takes about that long for changes in blood sugar to fully show up in your A1C percentage.
Getting the Most Out of Home Testing
Record every home result alongside the date, and bring those numbers to your next medical appointment. Tracking the trend over time matters more than any single reading. A home result of 7.2% is less meaningful on its own than knowing you went from 7.8% six months ago to 7.2% now.
Store unused kits according to the package instructions. Most need to stay between 59°F and 86°F, and many have expiration dates that are closer than you might expect. Using an expired kit is one of the easiest ways to get an unreliable result. Check the date before every test, especially if you bought a multi-pack months ago.