How to perform an A1C test at home with fasting blood sugar 98–108 mg/dL

by B.A. Ajay






Question


Hi,


My daily fasting blood sugar level ranges from 98 to 108, kindly direct me on how I can perform the ac1 test on myself at home.


Thanks.


—Ajai





Quick Answer


Home A1C kits are available and usually use a finger-stick blood sample. Some provide a result at home, while others require the sample to be mailed to a laboratory.


Use a home A1C kit for monitoring, not for diagnosing diabetes or prediabetes. Because some of your fasting readings are 100–108 mg/dL, arrange an NGSP-certified laboratory A1C and fasting plasma glucose for diagnosis.




Answer by Dr. Albana Greca, MD, MMedSc



Hello Ajai,


Your readings are close together, but they are not all completely normal under current laboratory criteria. A fasting result of 98 mg/dL is normal. Results from 100 to 108 mg/dL fall within the laboratory prediabetes range if confirmed with properly collected venous plasma testing.



How Are Fasting Results Classified?



  • Normal: 99 mg/dL or below

  • Prediabetes: 100–125 mg/dL

  • Diabetes: 126 mg/dL or higher when appropriately confirmed


A home meter cannot diagnose prediabetes or diabetes. Meter variation, finger contamination, strip condition, and technique can change the result. See our fasting blood sugar guide.



What Does A1C Measure?


A1C measures the percentage of hemoglobin with glucose attached and reflects average glucose over approximately the previous two to three months. Recent weeks influence the result more than the earliest weeks.


You can take an A1C test at any time. Fasting is not required, and an ordinary meal immediately before testing does not substantially alter the result.



How to Perform a Home A1C Test


Follow the instructions supplied with the exact kit. The usual process is:



  1. Confirm the kit is intended for home use and is not expired.

  2. Store it at the manufacturer’s recommended temperature.

  3. Wash hands with soap and warm water, then dry completely.

  4. Prepare the lancet, collector, cartridge, timer, and other parts.

  5. Prick the side of a fingertip with the single-use lancet.

  6. Collect the required blood amount without contaminating it.

  7. Transfer the sample exactly as directed.

  8. For an immediate kit, activate the cartridge and time it precisely.

  9. For a mail-in kit, label, package, and send the sample as instructed.

  10. Record the result, kit name, lot number, and date.




A1C Kits Are Not All the Same


Some kits show a percentage at home within minutes. Others only collect the sample for laboratory analysis. Do not assume every A1C kit works like a glucose meter, and never reuse a lancet or cartridge.




How Is A1C Interpreted?



  • Normal: below 5.7%

  • Prediabetes: 5.7–6.4%

  • Diabetes: 6.5% or higher when appropriately confirmed


For diagnosis, current standards require an NGSP-certified laboratory method standardized to the DCCT reference assay. Without unmistakable hyperglycemia, an abnormal result normally needs confirmation.


Our A1C interpretation guide explains the relationship between A1C and average glucose.



Can a Home A1C Kit Diagnose Prediabetes?


No. Even an FDA-cleared over-the-counter kit should not replace laboratory diagnosis. Home collection and point-of-care methods may help with monitoring, but technique, storage, sample size, and device performance can affect accuracy.


If a home result is 5.7% or higher, unexpectedly low or high, or inconsistent with glucose readings, confirm it through a clinician and an appropriate laboratory.



When Should You Prefer a Laboratory Test?



  • You are being screened for prediabetes or diabetes.

  • A home result is near or above a diagnostic threshold.

  • A1C does not match fasting or after-meal glucose.

  • You have thirst, frequent urination, weight loss, or blurry vision.

  • You may have anemia, kidney disease, or a hemoglobin variant.


See our diabetes blood-test guide for A1C, fasting glucose, and oral glucose tolerance testing.



When Can A1C Be Misleading?


A1C may be inaccurate when red blood cells or hemoglobin are affected, including:



  • Iron-deficiency or hemolytic anemia

  • Recent blood loss, transfusion, or anemia treatment

  • Kidney or liver disease

  • Some hemoglobin variants

  • Pregnancy

  • Conditions or medicines altering red-cell survival


The clinician may then rely more on plasma glucose, continuous monitoring, fructosamine, or another suitable measure.



How Often Should A1C Be Checked?


Everyone does not have to wait exactly three months:



  • Stable diabetes at goal: often at least twice yearly

  • Recent treatment change or glucose above goal: commonly about every three months

  • Confirmed prediabetes: generally at least annually

  • No diabetes or prediabetes: according to age and risk


Testing sooner than three months can sometimes be useful after a major change, although the result still includes earlier glucose exposure.




Do Not Change Treatment From a Home Result Alone


Do not start, stop, or change diabetes medicine based only on a home A1C kit. Discuss a result in the prediabetes or diabetes range with a clinician.




What Should You Do With Readings of 98–108?



  1. Measure fasting glucose after at least eight hours without calories.

  2. Arrange laboratory fasting plasma glucose and A1C.

  3. Record sleep, illness, medicines, weight changes, and family history.

  4. Maintain balanced meals, activity, sleep, and a healthy weight.

  5. Do not label yourself diabetic from home readings alone.



What I want you to remember: you can perform A1C at home with an approved finger-stick kit, but use it for monitoring. Because fasting readings of 100–108 mg/dL can fall within the laboratory prediabetes range, confirm your status with laboratory A1C and fasting plasma glucose.




Written by: Dr. Albana Greca, MD, MMedSc, Family Physician

Medically reviewed by: Dr. Ruden Cakoni, MD, Endocrinologist

Last medically reviewed: August 5, 2026


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Safety note: Home A1C results are monitoring tools; laboratory testing is required for reliable diagnosis.



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