HbA1c (NGSP)
MetabolismHbA1c (NGSP) expresses glycated hemoglobin as a percentage, reflecting average blood sugar levels over the past 2–3 months.
It is the same measurement as HbA1c (IFCC) but reported in the older NGSP/DCCT unit system (%). An HbA1c of 5.7–6.4% indicates prediabetes; 6.5% or above suggests diabetes.
Reference range
Source: Ahead Health benchmark
Diabetic
Source: Ahead Health benchmark
Reference ranges may vary between labs and assays. Always interpret results with your healthcare provider. · LOINC code: 4548-4
Why this matters
Elevated NGSP HbA1c indicates chronically high blood sugar, increasing the risk of diabetes-related complications such as nerve, kidney, and cardiovascular damage. Lifestyle factors influencing levels include diet (limiting refined sugars and processed foods, emphasizing vegetables, whole grains, and protein), regular physical activity, maintaining a healthy body weight, adequate sleep, and stress management. Regular monitoring helps guide lifestyle and medical measures to maintain healthy glucose control.
How this connects to other biomarkers
- HbA1c reflects average blood sugar over the prior 8–12 weeks — 5.7–6.4% (39–46 mmol/mol) is prediabetes; ≥ 6.5% (≥ 48 mmol/mol) defines diabetes.
- Falsely low HbA1c can occur with red blood cell breakdown (low Hemoglobin, high LDH-1 (LDH Isoenzyme 1)), recent transfusion, or shortened red-cell survival; falsely high with iron-deficiency anemia and kidney failure.
- Discordance between HbA1c and Fasting Glucose / Fasting Insulin should prompt reconsideration of red-cell turnover or non-diabetic causes of hyperglycemia.
Included in
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