Why is Hemoglobin A1C important?

Hemoglobin A1C (HbA1c) reflects average blood glucose levels over the past 2-3 months by measuring the percentage of hemoglobin proteins that have glucose attached. In functional medicine, HbA1c is a cornerstone marker for metabolic health, insulin sensitivity, and diabetes risk assessment. Optimal levels (4.6-5.3%) indicate excellent blood sugar regulation and reduced risk of metabolic disease. Levels above 5.4% but below 5.7% suggest early metabolic dysfunction and increased cardiovascular risk, even before prediabetes diagnosis. Values 5.7-6.4% indicate prediabetes, while 6.5% or higher confirms diabetes.

What are the symptoms of abnormal Hemoglobin A1C levels?

High HbA1c: increased thirst, frequent urination, fatigue, blurred vision, slow wound healing, recurrent infections, unexplained weight changes, numbness or tingling in extremities. Low HbA1c (below 4%): may indicate hypoglycemia episodes, though very low values are often related to red blood cell abnormalities rather than glucose levels.

Back to Biomarkers

Hemoglobin A1C

energy metabolism

HSA/FSA Eligible

Instantly book at 2,000+ locations nationwide

HbA1c measures average blood glucose over 2-3 months, providing essential insight into long-term glycemic control and metabolic health.

Test Hemoglobin A1C now

Hemoglobin A1C (HbA1c) reflects average blood glucose levels over the past 2-3 months by measuring the percentage of hemoglobin proteins that have glucose attached
In functional medicine, HbA1c is a cornerstone marker for metabolic health, insulin sensitivity, and diabetes risk assessment
Optimal levels (4.6-5.3%) indicate excellent blood sugar regulation and reduced risk of metabolic disease
Levels above 5.4% but below 5.7% suggest early metabolic dysfunction and increased cardiovascular risk, even before prediabetes diagnosis
Values 5.7-6.4% indicate prediabetes, while 6.5% or higher confirms diabetes

HbA1c measures average blood glucose over 2-3 months, providing essential insight into long-term glycemic control and metabolic health

High HbA1c: increased thirst, frequent urination, fatigue, blurred vision, slow wound healing, recurrent infections, unexplained weight changes, numbness or tingling in extremities.
Low HbA1c (below 4%): may indicate hypoglycemia episodes, though very low values are often related to red blood cell abnormalities rather than glucose levels.

High HbA1c: type 2 diabetes, insulin resistance, excessive refined carbohydrate intake, sedentary lifestyle, chronic stress, poor sleep, obesity, certain medications (corticosteroids, thiazides), PCOS.
Low HbA1c: hemolytic anemia, significant blood loss, chronic kidney disease, liver disease, certain hemoglobin variants (HbS, HbC), pregnancy, iron deficiency anemia.

How it works: 4 easy steps

Step01

GET STARTED

Choose your tests

Select a core panel or build a fully customized lab plan based on your health goals and concerns.

Step02

VISIT A LAB

Quick & convenient testing

Schedule your appointment at a nearby certified lab location. Most visits take just a few minutes.

Step03

REVIEW YOUR INSIGHTS

Clear, personalized results

Receive a detailed report with expert insights, actionable recommendations, and optional 1:1 guidance.

Step04

IMPROVE & MONITOR

Optimize your health

Track progress, retest when needed, and adjust your plan to continuously improve your well-being.

Our Comprehensive Panels

Essential– Start feeling better

$99/one-time

Foundation for a full basic health picture.

Check for deficiencies behind low energy and immunity
Catch heart basics before they become real issues
Find iron gaps that drive fatigue and brain fog

Advanced – Metabolic & Nutrition

$199/one-time

Deeper metabolic and nutritional insights.

Spot early metabolic issues before they become long-term problems
Uncover B12/folate gaps tied to fatigue and cognition
Balance nutrients to stabilize energy and mood

Max — Longevity & early detection

$399/one-time

Comprehensive testing for lifelong health.

Flag early cancer and inflammation signals before symptoms
Reveal hidden autoimmune and chronic stress drivers
Deep gut/liver/pancreas insights to protect longevity

Start testing at $99

Explore Other Tests

Discover more tests for deeper health insights

Basophils

Basophil percentage reflects allergic response mechanisms and immune system reactivity. Optimal levels support appropriate allergic responses without excessive inflammatory activation.

Learn More

Apolipoprotein B

ApoB represents the number of atherogenic particles in the blood, providing superior cardiovascular risk assessment compared to traditional cholesterol measurements.

Learn More

Nitrite

Urinary nitrites specifically detect nitrate-reducing bacteria, helping confirm bacterial UTIs and guide treatment decisions.

Learn More

Monocyte-to-Lymphocyte Ratio (MLR)

The Monocyte-to-Lymphocyte Ratio (MLR) is an inflammatory marker that reflects the balance between innate (monocyte) and adaptive (lymphocyte) immune responses.

Learn More

Our Customers Says

Fast booking, smooth process, and detailed results.

— Olivia Revan

Caught an issue early. I'm thankful I didn't wait.

— Denny Danaid

The results were so detailed and easy to understand.

— Sarah Mitchell

Great service! Found important health markers I didn't know about.

— Michael Chen

Quick turnaround and very professional. Highly recommend!

— Emma Johnson

Fast booking, smooth process, and detailed results.

— Olivia Revan

Caught an issue early. I'm thankful I didn't wait.

— Denny Danaid

The results were so detailed and easy to understand.

— Sarah Mitchell

Great service! Found important health markers I didn't know about.

— Michael Chen

Quick turnaround and very professional. Highly recommend!

— Emma Johnson

Have questions?

View all FAQs

Hemoglobin A1C

About Hemoglobin A1C

Why Hemoglobin A1C Matters

Symptoms of Hemoglobin A1C

What Affects Hemoglobin A1C Levels

How it works: 4 easy steps

Choose your tests

Quick & convenient testing

Clear, personalized results

Optimize your health

Our Comprehensive Panels

Explore Other Tests

Basophils

Apolipoprotein B

Nitrite

Monocyte-to-Lymphocyte Ratio (MLR)

Our Customers Says

Have questions?