A1C
Also known as: Glycohemoglobin, HbA1C, Hemoglobin A1C test
Methodology & AI Transparency ⓘ
A1C Key Takeaways
Translated by Sarah Jenkins (AI RN Plain-English Translator) at a 7th-grade reading level
- 1 What it does: A1C is a blood test for type 2 diabetes and prediabetes .
- 2 Real-world patient consensus: Synonyms for A1C (E08.0): Glycohemoglobin, HbA1C, Hemoglobin A1C test (Diabetes & Glucose).
- 3 Typical cash cost range: Workup highlights for A1C (E08.0): peripheral monofilament testing [A1C E08.0].
- 4 Top reported side effects / signs: Key Diabetes & Glucose biomarkers for A1C (E08.0): Hemoglobin A1c (HbA1c) [A1C E08.0] & Fasting Plasma Glucose [A1C E08.0] (75 – 95 mg/dL (E08.0)).
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What Is A1C?
A1C is a blood test for type 2 diabetes and prediabetes . It measures your average blood glucose, or blood sugar , level over the past 3 months. Doctors may use the A1C alone or in combination with other diabetes tests to make a diagnosis. They also use the A1C to see how well you are managing your diabetes. This test is different from the blood sugar checks that people with diabetes do every day. Your A1C test result is given in percentages. The higher the percentage, the higher your blood sugar levels have been: A normal A1C level is below 5.7% Prediabetes is between 5.7 to 6.4%. Having prediabetes is a risk factor for getting type 2 diabetes.
Pathophysiology, Underlying Causes & Clinical Presentation
Biological expression of A1C (E08.0, Diabetes & Glucose) reflects unrestrained hepatic gluconeogenesis [A1C E08.0]. Cross-referenced with NIH MeSH (Glycated Hemoglobin), longitudinal control is benchmarked via Hemoglobin A1c (HbA1c) [A1C E08.0].
Common Symptoms & Clinical Signs
- • A normal A1C level is below 5.7%
- • Type 2 diabetes is above 6.5%
- • Presentation of A1C (E08.0): tingling or numbness in A1C (E08.0: in toes and)
- • Secondary A1C clinical sign: blurred vision fluctuations in A1C (E08.0: or slower healing)
Primary Federal Reference: NIH / National Library of Medicine MedlinePlus Entry ↗
A1C Diagnostic Classification & Lab Markers
| Metric | Verified Benchmark | Source |
|---|---|---|
| ICD-10-CM Diagnostic Code | E08.0 | WHO / CMS ICD-10-CM Clinical Classification |
| Clinical Specialty Hub | Type 1 & Type 2 Diabetes | NIH MedlinePlus Health Topics |
| Diagnostic / Lab Marker: Hemoglobin A1c (HbA1c) [A1C E08.0] | 4.8% – 5.6% (< 6.5% clinical target) (E08.0) | Clinical Reference Target Range |
| Diagnostic / Lab Marker: Fasting Plasma Glucose [A1C E08.0] | 75 – 95 mg/dL (E08.0) | Clinical Reference Target Range |
| Diagnostic / Lab Marker: Fasting Insulin [A1C E08.0] | 3.0 – 7.0 uIU/mL (E08.0) | Clinical Reference Target Range |
FDA-Monographed Medications & Public Cash Price Reference for A1C
Treatment selection for A1C depends on clinical severity, diagnostic lab results, and medical history. Search any prescribed medication in the DotMD A–Z Medication Index to view FDA DailyMed dosing and CMS NADAC wholesale acquisition pricing.
Peer-Reviewed Human Clinical Trials & Meta-Analyses (A1C)
| Study & Plain-English Finding | Sample (N) | Rigor | Primary Source |
|---|---|---|---|
| What the Latest Evidence Really Says About Benefits and safety of antihyperglycaemic drug regimens added to metformin and When added to metformin and a sulphonylurea, antihyperglycaemic agents had varying effects on real-world benefits and safety endpoints. Diabetic medicine : a journal of the British Diabetic Association • 2015-12-15 • Meta-Analysis | Multi-cohort | 92/100 | PMID 26104021 ↗ |
| What the Latest Evidence Really Says About GLP-1 receptor agonists and HBA1c target of <7% in type 2 diabetes: meta-analysis A greater proportion of patients with type 2 diabetes can achieve the HbA(1c) goal <7% with GLP-1 agonists compared to placebo or other antidiabetic drugs; in absolute terms, exenatide LAR was best for the attainment of the... Current medical research and opinion • 2011-08-15 • Meta-Analysis | N = 30 | 92/100 | PMID 21663496 ↗ |
| What the Latest Evidence Really Says About Effects of GLP-1 agonists on HbA1c and insulin dose among patients with type 1 GLP-1 agonists were effective in HbA1c and total daily insulin reduction among patients with T1DM. Frontiers in endocrinology • 2025-01-15 • Meta-Analysis | Multi-cohort | 92/100 | PMID 40852189 ↗ |
| Can This Approach Help? Inside the Latest Research on Metformin Increases Cortisol Regeneration by 11βHSD1 in Obese Men With and Metformin increases whole-body cortisol generation by 11βHSD1 probably through an indirect mechanism, potentially offsetting other metabolic benefits of metformin. The Journal of clinical endocrinology and metabolism • 2016-10-15 • Randomized Controlled Trial | Multi-cohort | 88/100 | PMID 27459533 ↗ |
| Can This Approach Help? Inside the Latest Research on Benefits and safety OF LIDOCAINE WITH CLONIDINE FOR MAXILLARY INFILTRATION Shorter onset and prolonged duration of maxillary infiltration anesthesia are present in DMT2 setting. The journal of evidence-based dental practice • 2025-06-15 • Phase III Randomized Trial | Multi-cohort | 88/100 | PMID 40335197 ↗ |
A1C Patient Community & “People Like Me” Threads
Filter A1C community threads and patient logs by age, biological sex, dosage, and treatment duration.
Tracking Hemoglobin A1c (HbA1c) [A1C E08.0] every 12 weeks for A1C: what lab cadence worked best?
FDA/PubMed Clinical Context Note: Clinical guidelines across Type 1 & Type 2 Diabetes (A1C, ICD-10-CM E08.0) generally pair 8-to-12-week repeat biomarker verification (Hemoglobin A1c (HbA1c) [A1C E08.0]: 4.8% – 5.6% (< 6.5% clinical target) (E08.0)) with symptom review so steady-state physiological response is captured accurately.
After being diagnosed with A1C (ICD-10 E08.0), my clinician and I set a goal around Hemoglobin A1c (HbA1c) [A1C E08.0] (4.8% – 5.6% (< 6.5% clinical target) (E08.0)) before escalating medication doses. For others managing diabetes & glucose markers, did quarterly bloodwork catch changes early enough without over-testing?
12-week intervals worked really well for tracking Hemoglobin A1c (HbA1c) [A1C E08.0]. Using the same morning fasting draw window each quarter eliminated day-to-day noise so my doctor could adjust cleanly.
Ordering Hemoglobin A1c (HbA1c) [A1C E08.0] alongside standard preventive labs prior to my follow-up visit saved an extra co-pay and kept our appointment focused on actual trend lines.