hemoglobin A1c
noun
: a stable glycoprotein formed when glucose binds to hemoglobin A in the blood
Blood sugar was assessed by measuring the amount of hemoglobin A1c in the participants' blood, a test that looks for hemoglobin with sugar attached to it.—
Gina Kolata
Gina Kolata
also
: a test that measures the level of hemoglobin A1c in the blood as a means of determining the average blood sugar concentrations for the preceding two to three months
Note: Both the glycoprotein and the test are also called A1c, glycated hemoglobin, glycohemoglobin, glycosylated hemoglobin, HA1c, and HbA1c.
Examples of hemoglobin A1c in a Sentence
Recent Examples on the Web
Meeting fiber goals has also improved blood sugar levels (hemoglobin A1c, or HbA1c) over time.6
5.
—Brittany Lubeck, Verywell Health, 18 June 2025
One meta-analysis observed significant reductions in fasting glucose and hemoglobin A1c (HbA1c) with 35 mg of zinc supplementation daily.
—Melissa Nieves, Verywell Health, 4 June 2025
Both have advised her to let her hemoglobin A1c, a measure of average blood glucose over several months, rise past 7%.
—The New York Times, San Diego Union-Tribune, 15 Apr. 2025
In a study of 891 patients over a span of 3 years, patients of physicians who were graded with ‘high empathy’ via a standardized scale, seemed to have better control of hemoglobin A1c, than were patients of physicians with lower empathy scores (40%, P < .001).
—Hansa Bhargava, Forbes.com, 7 Apr. 2025
In one study of brown seaweed, participants saw a significant improvement in hemoglobin A1c (HbA1c) levels, an essential measurement of blood sugar control.1
Multiple reviews also report that seaweed positively impacts blood sugar levels, especially in people with type 2 diabetes.
—Adrienne Dellwo, Verywell Health, 14 Mar. 2025
That accounts for a number of routine lab tests, including a comprehensive metabolic panel, lipid panel, CBC with differential, hemoglobin A1c and thyroid-stimulating hormone.
—John Yoo and John Shu, Newsweek, 23 Jan. 2025
One study found that sulforaphane, in the form of broccoli sprout extract, can help lower fasting blood glucose (sugar) and hemoglobin A1c (HbA1c) levels in people with uncontrolled type 2 diabetes.
—Chelsea Rae Bourgeois, Rdn, Ld, Health, 11 Jan. 2025
In addition to helping control hemoglobin A1c and blood glucose levels, fiber decreases inflammation, which helps lower the risk of heart attack and stroke.
—Angela Haupt, TIME, 15 Oct. 2024
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Brittany Lubeck, Verywell Health, 18 June 2025
One meta-analysis observed significant reductions in fasting glucose and hemoglobin A1c (HbA1c) with 35 mg of zinc supplementation daily.
—Melissa Nieves, Verywell Health, 4 June 2025
Both have advised her to let her hemoglobin A1c, a measure of average blood glucose over several months, rise past 7%.
—The New York Times, San Diego Union-Tribune, 15 Apr. 2025
In a study of 891 patients over a span of 3 years, patients of physicians who were graded with ‘high empathy’ via a standardized scale, seemed to have better control of hemoglobin A1c, than were patients of physicians with lower empathy scores (40%, P < .001).
—Hansa Bhargava, Forbes.com, 7 Apr. 2025
In one study of brown seaweed, participants saw a significant improvement in hemoglobin A1c (HbA1c) levels, an essential measurement of blood sugar control.1
Multiple reviews also report that seaweed positively impacts blood sugar levels, especially in people with type 2 diabetes.
—Adrienne Dellwo, Verywell Health, 14 Mar. 2025
That accounts for a number of routine lab tests, including a comprehensive metabolic panel, lipid panel, CBC with differential, hemoglobin A1c and thyroid-stimulating hormone.
—John Yoo and John Shu, Newsweek, 23 Jan. 2025
One study found that sulforaphane, in the form of broccoli sprout extract, can help lower fasting blood glucose (sugar) and hemoglobin A1c (HbA1c) levels in people with uncontrolled type 2 diabetes.
—Chelsea Rae Bourgeois, Rdn, Ld, Health, 11 Jan. 2025
In addition to helping control hemoglobin A1c and blood glucose levels, fiber decreases inflammation, which helps lower the risk of heart attack and stroke.
—Angela Haupt, TIME, 15 Oct. 2024
Cite this Entry
“Hemoglobin A1c.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hemoglobin%20A1c. Accessed 14 Jul. 2025.
Copy CitationMedical Definition
hemoglobin A1c
noun-ˌā-ˌwən-ˈsē
: a stable glycoprotein formed when glucose binds to hemoglobin A in the blood
Blood sugar was assessed by measuring the amount of hemoglobin A1c in the participants' blood, a test that looks for hemoglobin with sugar attached to it.—Gina Kolata
Gina Kolata
also
: a test that measures the level of hemoglobin A1c in the blood as a means of determining the average blood sugar concentrations for the preceding two to three months
called also A1c, glycated hemoglobin, glycohemoglobin, glycosylated hemoglobin, HA1c, HbA1c
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