by JYOYI ARORA
(ROHINI, SECTOR 15, DELHI)
Written by: Dr. Albana Greca Sejdini, MD, MMedSc
Medically reviewed by: Dr. Ruden Cakoni, MD, Endocrinologist
Last medically reviewed: July 2026
Question from Jyoyi Arora:
I want to know the fasting and after-food blood sugar levels for different age groups.
Diabetes diagnostic cutoffs do not change for every age group. In nonpregnant people, laboratory criteria include fasting plasma glucose of 126 mg/dL (7.0 mmol/L) or higher, A1C of 6.5% or higher, or a two-hour result of 200 mg/dL (11.1 mmol/L) or higher during a formal 75-g oral glucose tolerance test. Unless high glucose is unequivocal, an abnormal result normally needs confirmation.
Daily treatment targets are different from diagnostic cutoffs. They are individualized according to age, diabetes type, pregnancy, medicines, risk of low blood sugar, other illnesses, and overall health.
| Group | Fasting or before meals | After meals |
|---|---|---|
| Children and teenagers with diabetes | No universal target fits every child. A pediatric diabetes team should set goals according to diabetes type, age, treatment and hypoglycemia risk. | |
| Many nonpregnant adults with diabetes | 80–130 mg/dL (4.4–7.2 mmol/L) | Below 180 mg/dL (10.0 mmol/L), measured 1–2 hours after the meal begins |
| Healthy older adults with diabetes | Often 80–130 mg/dL (4.4–7.2 mmol/L) | Individualized; avoiding low blood sugar is important |
| Older adults with complex health problems | Often 90–150 mg/dL; sometimes 100–180 mg/dL in very complex or poor health | Individualized to prevent hypoglycemia and symptomatic high glucose |
| Diabetes during pregnancy | Below 95 mg/dL (below 5.3 mmol/L) | Below 140 mg/dL at 1 hour or below 120 mg/dL at 2 hours |
Important: These are treatment targets, not a self-diagnosis chart. Pregnancy treatment goals also differ from gestational-diabetes diagnostic thresholds.
A home reading after a usual meal is useful for monitoring, but it is not the same as a two-hour laboratory oral glucose tolerance test. Compare fasting, after-meal and A1C values in the normal blood sugar level chart and blood sugar levels by time of day.
If a child has excessive thirst, frequent urination, unexplained weight loss, vomiting, difficult breathing or confusion, seek prompt care. Type 1 diabetes can develop quickly.
Question from Ram Singh:
My blood sugar was 98 mg/dL two hours after eating. I became unconscious while driving my scooter yesterday. Could this have been caused by low blood sugar?
A glucose reading of 98 mg/dL (5.4 mmol/L) is not low. Hypoglycemia is generally below 70 mg/dL (3.9 mmol/L). If 98 was measured after recovery, however, it cannot show your glucose at the moment you lost consciousness.
Urgent safety advice: Loss of consciousness while driving needs urgent assessment even if you now feel well. Do not drive until a clinician has evaluated the cause and confirmed it is safe. If the episode was not assessed, seek urgent care now.
Low glucose can cause fainting or seizures, especially with insulin or medicines that cause hypoglycemia. Other causes include a heart-rhythm problem, sudden blood-pressure drop, dehydration, seizure, medication effect or stroke. A normal glucose reading afterward does not identify the cause.
A clinician may review the event, medicines, glucose records, blood pressure and heart rhythm and decide whether blood tests, an ECG or neurological assessment are needed. Bring your glucose record and medicine list.
For more safety information, see what to do when blood sugar is below 70 mg/dL and when blood sugar symptoms may be an emergency.
Medical disclaimer: Educational only—not personal medical advice. Seek care from a qualified healthcare professional for diagnosis and treatment.
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