You can check your A1C at home using either an instant fingerstick test kit that gives results in about five minutes or a mail-in kit that sends your blood sample to a lab for analysis within a few days. Both types are FDA-cleared and available without a prescription at pharmacies and online retailers, typically costing between $49 and $99 per test.
Two Types of Home A1C Tests
Home A1C tests fall into two categories, and the one you choose depends on whether you want immediate results or lab-grade precision.
Instant fingerstick kits use a small device that analyzes a drop of blood on the spot. The PTS Diagnostics A1CNow Self Check is the most widely available option in this category, running about $82 per test. You prick your finger, apply blood to a test strip or cartridge, and read your A1C percentage directly on the device within five minutes. These kits use a combination of two detection methods to measure the percentage of sugar-coated hemoglobin in your sample.
Mail-in lab kits also start with a fingerstick, but you collect your blood sample on a card or in a small tube and ship it to a certified laboratory. Results typically come back in one to five business days through an online portal. Options include the Everlywell HbA1c test ($49), the DTI Laboratories A1c test (about $52 with results in 48 hours), and the myLAB Box screening test ($74). Some mail-in kits bundle A1C with other markers like cholesterol or blood sugar for a higher price.
How to Take the Test
The process is straightforward regardless of which kit you buy. Wash your hands with warm water first, both for cleanliness and to improve blood flow to your fingertips. Use the lancet included in the kit to prick the side of your fingertip, which hurts less than pricking the pad. Squeeze gently until you get a blood drop large enough to fill the collection area on your test strip or sample card.
For instant kits, you’ll insert the strip or cartridge into the reader and wait a few minutes for your result to appear on a small screen. For mail-in kits, let the blood sample dry if instructed, seal it in the provided packaging, and drop it in the mail. Most kits include a prepaid shipping label. You’ll register your kit online beforehand so results can be linked to your account.
No fasting is required. A1C reflects your average blood sugar over roughly two to three months, so what you ate today or yesterday won’t affect the number.
How Accurate Are Home Kits?
In a validation study of the A1CNow self-check kit, 93.2% of user-obtained results fell within the acceptable accuracy range compared to a certified laboratory reference method. The correlation between home results and lab results was strong (R² = 0.925), and the results users got on their own closely matched those obtained by healthcare professionals using the same device.
That said, home kits do show a slight upward bias. At a true A1C of 6%, the kit read about 0.2 percentage points higher on average. At 8%, the bias was 0.22 points, and at 10%, it was 0.24 points. This means if your home test reads 6.7%, your actual lab value might be closer to 6.5%. For tracking trends over time, this level of accuracy is useful. For making treatment decisions, a lab-confirmed result is still the standard.
Understanding Your Results
A1C is reported as a percentage. The general thresholds are:
- Below 5.7%: Normal blood sugar control
- 5.7% to 6.4%: Prediabetes range
- 6.5% or higher: Diabetes range
If you already have diabetes, treatment targets vary, but many people aim for an A1C below 7%.
You can convert your A1C into an estimated average glucose using a simple formula: multiply your A1C by 28.7, then subtract 46.7. That gives you your average blood sugar in mg/dL over the past two to three months. For example, an A1C of 7% translates to an estimated average glucose of about 154 mg/dL. An A1C of 8% works out to roughly 183 mg/dL. This number can be easier to relate to if you’re used to checking daily blood sugar with a glucometer.
When Home Results May Be Unreliable
Several common medical conditions can throw off A1C readings, whether taken at home or in a lab. The issue lies in how A1C works: it measures sugar attached to hemoglobin inside red blood cells. Anything that changes the lifespan or structure of those cells can skew the result.
Conditions that falsely raise A1C include iron deficiency anemia, vitamin B12 or folate deficiency, and chronic kidney disease with high urea levels. In each case, red blood cells either live longer than usual or accumulate compounds that mimic the sugar-hemoglobin bond. Chronic alcohol use and long-term use of aspirin or opioids can also push readings higher than your actual blood sugar average would suggest.
Conditions that falsely lower A1C include recent blood loss, hemolytic anemia (where red blood cells break down faster than normal), an enlarged spleen, and end-stage kidney disease. Pregnancy also tends to produce lower readings because red blood cells turn over faster, lasting about 90 days instead of the usual 120. Certain supplements, particularly vitamin E, can lower readings as well.
Hemoglobin variants, most commonly hemoglobin S (sickle cell) and hemoglobin C, present a particular challenge. People who carry two copies of these variant genes (homozygous) generally cannot rely on A1C measurements at all. Those who carry one copy (heterozygous, like sickle cell trait) can get useful results, but only with certain testing methods. If you know you carry a hemoglobin variant, talk with your provider about whether A1C or an alternative marker like fructosamine is more appropriate for monitoring your blood sugar.
Home Testing vs. Lab Testing
The main advantages of home A1C testing are convenience and speed. You can test on your own schedule without a blood draw appointment, and instant kits give you a number in minutes. For people monitoring prediabetes through lifestyle changes or tracking diabetes management between office visits, home kits provide a useful checkpoint.
Lab tests still offer higher precision and are processed using more sophisticated equipment, including high-pressure liquid chromatography, which separates hemoglobin types with greater resolution than a handheld device can achieve. Labs are also better equipped to flag interference from hemoglobin variants or other conditions that might distort results.
A practical approach is to use home tests for interim monitoring and confirm with a lab test at least once or twice a year. If a home result surprises you, either significantly higher or lower than expected, a lab test is worth getting before making any changes to your routine. Home kits are not intended for initial diagnosis of diabetes. That determination should be based on lab-confirmed values, often repeated on a second occasion to rule out error.
How Often to Test
A1C reflects roughly the last two to three months of blood sugar history, so testing more frequently than every three months won’t capture meaningful changes. For most people managing diabetes, testing every three to six months is standard. If you’re monitoring prediabetes or tracking the effects of a new exercise or eating plan, every three months gives you enough data to see whether the trend is moving in the right direction.