DIA 8 values Updated Apr 29, 2026

Diabetes Panel

A diabetes panel measures the values most useful for tracking blood-sugar control over time: HbA1c (the 2–3 month average), fasting glucose (the snapshot of one moment), and often fasting insulin (which describes how hard the pancreas is working to keep glucose in range). These three together form a much fuller picture than any single value. BloodSight charts every A1c, glucose, and insulin reading across visits, so the trajectory is visible alongside individual values.

Read the Diabetes Panel guide

What a Diabetes Panel Captures

A diabetes panel measures three different aspects of glucose metabolism. A1c reflects average glucose exposure over the prior 2–3 months, so it smooths out day-to-day variation. Fasting glucose is the value at one specific moment — usually morning, after 8+ hours without food. Fasting insulin describes how much insulin the pancreas was producing at that same moment. Together, the three values describe both the result (glucose level) and the system producing it (insulin response), which is more informative than any single value alone.

When a Diabetes Panel Is the Right Test

Diabetes panels are ordered to screen for prediabetes and diabetes, to monitor an existing diabetes diagnosis, or as part of a metabolic-health workup when other risk factors (body composition, family history, gestational history) are present. They are also one of the most common labs ordered in lifestyle-medicine and longevity-focused practices because the trajectory of A1c and fasting insulin tracks metabolic-health status more sensitively than fasting glucose alone.

Tests Inside a Diabetes Panel

The standard diabetes panel reports three values. HbA1c (A1c) reflects glycated hemoglobin, expressed as a percentage; the higher the average glucose over the prior 2–3 months, the higher the A1c. Fasting glucose is the plasma glucose level after an 8–12 hour fast, in mg/dL or mmol/L. Fasting insulin is the insulin level at the same fasting moment, in µIU/mL. Some panels also include HOMA-IR (Homeostatic Model Assessment of Insulin Resistance), calculated from fasting glucose and fasting insulin, which estimates insulin resistance numerically.

How A1c, Glucose, and Insulin Read Together

A diabetes panel pairs three values that describe glucose metabolism on different timescales. Reading them together gives a much fuller picture than any single value alone — and the trajectory of A1c across multiple panels is usually the most informative metric overall.

  1. 1

    A1c — the 2–3 month average

    HbA1c reflects glycated hemoglobin and tracks average glucose exposure over the prior 2–3 months. Because A1c reflects months rather than minutes, it smooths out day-to-day variation. ADA cutoffs: <5.7% is non-diabetic, 5.7–6.4% is prediabetic, ≥6.5% is diabetic.

  2. 2

    Fasting glucose — one snapshot

    Fasting glucose measures plasma glucose at one specific moment, after 8+ hours without food. It can shift day-to-day. ADA cutoffs: <100 mg/dL is normal, 100–125 mg/dL is impaired fasting glucose, ≥126 mg/dL on two separate draws indicates diabetes.

  3. 3

    Fasting insulin — pancreatic effort

    Fasting insulin describes how hard the pancreas is working to keep glucose in range at the fasting moment. Elevated fasting insulin with normal fasting glucose can describe early insulin resistance — the pancreas is over-producing insulin to compensate.

  4. 4

    HOMA-IR — calculated insulin resistance

    HOMA-IR is calculated from fasting glucose × fasting insulin / 405. Many references suggest HOMA-IR <1.5 as optimal, 1.5–2.5 as borderline, >2.5 as elevated. It's a screening proxy for insulin resistance, not a diagnostic test.

  5. 5

    Pattern across the panel

    Normal A1c with elevated fasting insulin describes a different metabolic picture than elevated A1c with normal insulin. Many lifestyle-medicine references suggest tighter targets than the ADA cutoffs — A1c <5.4%, fasting glucose <90 mg/dL, fasting insulin <6 µIU/mL — as optimal for long-term metabolic health, distinct from the standard 'non-diabetic' range.

Read the full Diabetes Panel guide

Diabetes Panel Reference Ranges

A diabetes panel pairs A1c with fasting glucose and often fasting insulin. Diabetic-cutoff values are well-established (A1c ≥6.5%, fasting glucose ≥126 mg/dL), but optimal metabolic-health targets in lifestyle-medicine references sit considerably tighter than the standard 'non-diabetic' cutoffs.

Test Normal range (Adult) Unit Flagged when
Hemoglobin A1c HbA1c 4–5.6 % < 4 or > 5.6
Fasting Glucose 70–99 mg/dL < 70 or > 99
Insulin 2–25 µIU/mL < 2 or > 25
C-Peptide 0.8–3.8 ng/mL < 0.8 or > 3.8
Fructosamine 205–285 µmol/L < 205 or > 285
Estimated Average Glucose eAG 70–99 mg/dL < 70 or > 99
HOMA-IR HOMA-IR 0–2.9 index < 0 or > 2.9
Glycated Albumin GA 11–17.8 % < 11 or > 17.8

What Drives Diabetes Panel Values

Diabetes panel values respond to recent carbohydrate intake (mostly relevant for fasting glucose), body composition, physical activity, sleep, and several common medications including steroids. A1c specifically reflects the prior 2–3 months — a single high reading describes a longer trend than a single fasting glucose.

Common factors for high values

  • Higher average glucose exposure — more glucose available in blood increases glucose attachment to hemoglobin over time. (affects Hemoglobin A1c)
  • Longer red cell lifespan — older circulating red blood cells have more time to accumulate glucose attachment. (affects Hemoglobin A1c)
  • Reduced hydration — lower plasma volume can concentrate measured blood values, including HbA1c. (affects Hemoglobin A1c)

Common factors for low values

  • Shorter red cell lifespan — red blood cells have less time to accumulate glucose attachment, which can lower HbA1c. (affects Hemoglobin A1c)
  • Recent blood loss — replacement of older red cells with younger cells can reduce the measured percentage. (affects Hemoglobin A1c)
  • Increased red cell production — a larger share of young red cells can pull HbA1c down. (affects Hemoglobin A1c)

All Diabetes Panel Values

Hemoglobin A1c

HbA1c

Hemoglobin A1c (HbA1c) is a lab value that reflects how much glucose has attached to hemoglobin inside red blood cells over time. It is often listed as HbA1c on a blood test and is reported as a percentage. As a panel result, it helps show longer-term blood sugar exposure rather than a single moment in time.

Adult Male %
4
5.6

Fasting Glucose

Fasting Glucose is a lab value that measures the concentration of glucose in a blood sample collected after a fasting period. It is commonly used in a Fasting Glucose test and helps describe how much circulating sugar is present at that moment. On a lab report or blood test, Fasting Glucose is usually interpreted alongside other diabetes-panel values and the stated reference range.

Adult Male mg/dL
70
99

Insulin

Insulin is a hormone measured in blood that helps show how the body is handling glucose at the time of testing. An Insulin test result is often reviewed with glucose and related markers to give context for the lab report. Insulin on a blood test can vary with fasting status, recent meals, and other day-to-day factors.

Adult Male µIU/mL
2
25

C-Peptide

C-Peptide is a blood measure related to insulin production. On a C-Peptide blood test, the result helps show how much C-Peptide is present and how it compares with the C-Peptide reference range. In diabetes panels, a C-Peptide test is often used alongside glucose and related markers to give a broader view of blood chemistry.

Adult Male ng/mL
0.8
3.8

Fructosamine

Fructosamine is a lab value that reflects how much glucose has attached to proteins in the blood over the past 2 to 3 weeks. On a Fructosamine on a lab report, it is used as a short-term marker of average blood sugar exposure rather than a single-day reading. Fructosamine on a blood test is often reviewed with other blood values to show broader patterns in blood chemistry.

Adult Male µmol/L
205
285

Estimated Average Glucose

eAG

Estimated Average Glucose (eAG) is a calculated value that estimates average blood sugar over time from a hemoglobin A1c result. On a lab report, eAG helps translate A1c into familiar glucose units, making the result easier to read. It is commonly shown alongside other diabetes-related markers and is reported in mg/dL or mmol/L.

Adult Male mg/dL
70
99

HOMA-IR

HOMA-IR

HOMA-IR is an index that estimates how much insulin resistance is present using fasting glucose and fasting insulin. On a lab report or blood test, it helps summarize how the body is responding to insulin rather than measuring a single blood component directly. HOMA-IR is often reviewed with other diabetes panel results to give a broader picture of glucose and insulin balance.

Adult Male index
0
2.9

Glycated Albumin

GA

Glycated Albumin (GA) is a blood measurement that reflects how much albumin has glucose attached to it. It is reported as a percentage and is often read alongside other blood test values on a Glycated Albumin on a lab report or Glycated Albumin on a blood test. GA helps describe recent changes in blood sugar exposure over a shorter window than older average markers.

Adult Male %
11
17.8

Compare values in this panel

How values in this panel relate to each other and what their differences mean.

Fasting and Timing for a Diabetes Panel

Fasting glucose and fasting insulin require fasting — typically 8–12 hours with nothing but water. A1c does not require fasting because it measures the prior 2–3 months of average glucose exposure rather than a single moment. Most labs draw all three together, in which case the fasting requirement applies. A morning draw is conventional because fasting is easier overnight; afternoon fasting draws produce equivalent values when the fasting window is the same.

Diabetes Panel — FAQ

What does a diabetes panel measure?
A diabetes panel measures three values that together describe glucose metabolism: HbA1c (the 2–3 month average glucose), fasting glucose (the snapshot at the moment of the draw), and fasting insulin (how hard the pancreas is working to keep glucose in range). Some panels also include HOMA-IR, calculated from fasting glucose and insulin to estimate insulin resistance. The combination is more informative than any single value alone.
What's the difference between A1c and fasting glucose?
A1c and fasting glucose answer different questions. Fasting glucose measures plasma glucose at one specific moment — usually morning, after 8+ hours without food — and can be high or low for that single draw. A1c reflects average glucose exposure over the prior 2–3 months and smooths out day-to-day variation. A normal fasting glucose with an elevated A1c describes a different pattern than the reverse, which is why both are usually read together.
What does a high A1c mean?
A high A1c means the average glucose level over the prior 2–3 months has been higher than the laboratory's reference range. The American Diabetes Association uses ≥5.7% as the prediabetic range and ≥6.5% as the diabetic range. Because A1c reflects months rather than minutes, an elevated value generally describes a longer-running pattern than a single fasting glucose reading. The trajectory of A1c across multiple draws usually matters more than any single value.
What are optimal A1c levels?
Lifestyle-medicine and metabolic-health references often suggest targets tighter than the standard non-diabetic cutoffs. The ADA cutoff is A1c <5.7%, but many metabolic-health references suggest A1c below 5.4%, fasting glucose below ~90 mg/dL, and fasting insulin below ~6 µIU/mL as optimal. These optimal targets describe what is associated with the lowest long-term metabolic risk in outcome data, which is not the same as the laboratory's printed reference range.
What is HOMA-IR?
HOMA-IR (Homeostatic Model Assessment of Insulin Resistance) is a calculated number that estimates insulin resistance from the fasting glucose and fasting insulin pair. It's not a separate blood test — it's derived from values already on the diabetes panel. Higher HOMA-IR means more insulin is needed to keep glucose in range, which is one of the earliest measurable signals of insulin resistance. Many references suggest HOMA-IR below 1.5–2.0 as optimal, though specific cutoffs vary.
Do I need to fast for a diabetes panel?
Yes, fasting glucose and fasting insulin require fasting — typically 8–12 hours with nothing but water. A1c itself does not require fasting because it measures the prior 2–3 months of average glucose. When all three are drawn together (the typical case), the fasting requirement applies.
How often should diabetes labs be tested?
Frequency depends on the goal. People without diabetes typically have A1c checked every 1–3 years as part of routine screening. People with prediabetes are often retested every 6–12 months. People with diabetes typically have A1c checked every 3–6 months. Lifestyle-medicine practices often retest more frequently when interventions are being followed. The ordering provider determines cadence.
What causes high A1c?
A1c reflects the average glucose exposure over the prior 2–3 months, so it rises when sustained glucose is higher than baseline. Common contributors include dietary patterns (especially refined carbohydrates), body composition, sleep deprivation, sedentary lifestyle, certain medications (steroids, some psychiatric medications), and chronic stress. Pregnancy can also shift A1c temporarily. Persistent elevations across multiple panels generally lead to a fuller workup.
Can lifestyle changes lower A1c?
Yes — A1c responds to sustained changes in dietary patterns, body composition, physical activity, and sleep over the prior 2–3 months. Because A1c reflects months of average glucose, it takes weeks to show measurable change after a lifestyle change starts. Fasting glucose responds faster but with more day-to-day variation. The most informative way to read lifestyle changes is the trajectory of A1c across consecutive draws spaced 2–3 months apart.
How does BloodSight track A1c trends?
BloodSight charts every A1c, fasting glucose, and fasting insulin value across all your uploaded diabetes panels in one timeline. The trajectory of A1c specifically — rising, falling, or stable — is the kind of pattern that's hard to see flipping through individual lab reports but obvious when every value is on a single chart.

Panels That Sit Beside Diabetes Labs

Diabetes labs are typically read alongside the rest of the cardiometabolic picture. The panels below most often share the same draw or follow-up workflow — cholesterol, the metabolic baseline, and a closer look at kidney function.

LIP

Lipid Panel
CMP

Comprehensive Metabolic Panel (CMP)
KID

Kidney Function Panel

Disclaimer

This content is for informational and educational purposes only. It is not intended as medical advice, diagnosis, or treatment recommendation. Reference ranges may vary by laboratory. Always discuss your results with a qualified healthcare professional.