What does an A1c of 4.8 mean?
An A1c of 4.8% (29 mmol/mol) is normal, under 5.7%. It means an average blood sugar near 91 mg/dL over the last few months.
NormalPrediabetes rangeDiabetes range
What it means
A1c is the share of your hemoglobin with sugar stuck to it, an average of the last few months that leans on the latest weeks. Under 5.7% is normal, 5.7 to 6.4% (39 to 47 mmol/mol) is the prediabetes range, and 6.5% (48) or more is the diabetes range. 4.8% sits 0.9 points under the prediabetes line.
Can this number decide it?
Only a certified lab A1c decides a band, and a diagnosis takes two results unless the number is clearly high. A home kit can only tell you to get a lab test. Anemia, sickle cell trait and some other blood conditions can throw A1c off, so pair it with a fasting glucose.
What to do
Nothing to do for this number. Test every 3 years from age 35, sooner if your weight goes up, and yearly once a number lands in the prediabetes range.
When to get help now
Call 911 or go to the ER if a blood sugar stays at 300 or more, or comes with vomiting so you can't keep fluids down, fruity breath or hard breathing. Under 70 with confusion, fainting or trouble swallowing is an emergency too. Pregnancy uses tighter numbers, so take any number to your midwife or doctor, and if you take insulin or a sulfonylurea, your targets come from your prescriber.
