How is Hba1c is 10.7 when my FBS is 129 and PPBS is 190?

by Prasanna
(Vijayawada)




Quick Answer


An HbA1c of 10.7% is high and corresponds to an estimated average glucose of about 260 mg/dL over the previous 2–3 months.


Your fasting glucose of 129 mg/dL and PPBS of 190 mg/dL are only two snapshots. They may miss higher glucose levels after other meals, overnight, or during previous weeks.




Why Can HbA1c Be Much Higher Than My Glucose Readings?



HbA1c and individual glucose tests measure different things:




  • FBS measures glucose at one moment after fasting.

  • PPBS measures glucose after a particular meal.

  • HbA1c reflects overall glucose exposure during roughly the previous 2–3 months.



So, readings of 129 and 190 mg/dL can occur even if glucose has been much higher at other times.



What Does an HbA1c of 10.7% Mean?



An HbA1c of 10.7% is well above the diabetes diagnostic threshold and above the usual treatment target for most nonpregnant adults with diabetes.



It corresponds to an estimated average glucose of about 260 mg/dL. This does not mean your glucose is always 260, but it suggests that your overall glucose exposure has been much higher than the two readings you provided.



Possible Reasons for the Difference




1. Glucose spikes may be missed.


Blood sugar may rise after meals, snacks, during illness, stress, or overnight. Testing only fasting and one PPBS can miss these periods.





2. Your glucose may have improved recently.


If your diet, activity, medicines, or insulin recently improved your readings, HbA1c may still reflect earlier weeks when glucose was higher.





3. PPBS timing matters.


A reading taken one hour after eating is not interpreted exactly like one taken two hours after the start of the meal.





4. Some conditions can affect HbA1c.


Iron-deficiency anemia, recent blood loss or transfusion, some hemoglobin variants, kidney disease, and other red-blood-cell disorders can sometimes alter HbA1c.


These should not be assumed to be the cause without medical evaluation.




What About Fasting Sugar of 129 mg/dL?



If 129 mg/dL was a properly performed laboratory fasting plasma glucose, it is above the diabetes diagnostic threshold of 126 mg/dL.



A single home-meter reading should not be used alone to diagnose diabetes. When results do not agree, your clinician may repeat or confirm laboratory testing.



What Should You Do Next?



Because an HbA1c of 10.7% is significantly elevated, discuss it with your doctor. They may consider:




  • repeating HbA1c if the result is unexpected;

  • checking laboratory fasting glucose;

  • reviewing readings at different times of day;

  • checking glucose before and 1–2 hours after meals;

  • using CGM when appropriate;

  • reviewing diet, medicines, illness, and adherence;

  • checking for anemia or other causes of HbA1c interference when indicated.




Important: Do not increase, stop, or change diabetes medicines or insulin based only on these numbers. An HbA1c of 10.7% deserves medical review.




When to Seek Urgent Medical Care



Seek urgent care if very high glucose is accompanied by:




  • repeated vomiting;

  • severe dehydration;

  • rapid or difficult breathing;

  • confusion or unusual drowsiness;

  • loss of consciousness.




Dr. Albana's Note


The key point is that two glucose readings cannot be directly compared with a three-month HbA1c result.


With an HbA1c of 10.7%, I would first look for glucose elevations that are not being captured by the current testing schedule. If repeated readings remain much lower than expected, the discrepancy should be investigated.




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


Last medically reviewed: August 20, 2026



Related Questions





Related Resources





References




  • American Diabetes Association. Understanding A1C.

  • NIDDK. The A1C Test & Diabetes.

  • NGSP. Factors That Interfere With HbA1c Test Results.



Medical disclaimer: Educational only. This does not replace personal medical advice, diagnosis, or treatment.



Click here to post comments or follow up

Ask the Doctor now? Simply click here to return to Blood Sugar Charts & Normal Ranges.