Skip to content

Glucose measured in whole blood by enzymatic method

Published: August 9, 2026Updated: August 16, 2026

This test checks your blood sugar (glucose) levels, which help monitor how your body uses energy from food.

Quick summary

["Blood sugar levels are critical for managing energy, metabolism, and overall health."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
104598-8
Short code
Glucose BldA Glucomtr-mCnc
Synonyms
Glucose BldA Glucomtr-mCnc
Category
glucose
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
70
Ref high
100
Critical range
50 N/A – 400 N/A
Fasting
true
Population
adult
Sex
all
Age range
18–65 years
Method
glucometer
CPT
82947
SNOMED
260395008
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Matters

Blood sugar levels fluctuate throughout the day and depend on factors like diet, activity, and health conditions. This test helps doctors assess whether your glucose levels are within a healthy range or if adjustments to treatment are needed.

How the Test Works

A small sample of your blood is taken, typically from a vein in your arm. The lab uses an enzymatic method to measure glucose concentration in your blood.

What to Expect Before the Test

No special preparation is usually required, but if you’re on diabetes medication, your doctor may advise timing your dose around the test to avoid interference.

What the Results Mean

Results provide a snapshot of your blood sugar at the time of testing. While reference ranges vary by lab, consistently high or low levels may signal diabetes, insulin resistance, or other metabolic issues.

Reference range

Fasting: 70-100 mg/dLN/A

Specimen: whole-blood

Fasting for 8-12 hours required. Water is permitted. Avoid chewing gum and smoking before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Glucose testing is foundational for diagnosing diabetes, prediabetes, and monitoring conditions like hypoglycemia. It also helps track responses to treatments like insulin or lifestyle changes.

Short name

None

Frequently asked questions

What causes blood sugar levels to change?
Blood sugar levels can rise due to eating sugary foods, stress, illness, or certain medications, and drop from physical activity, fasting, or hormonal changes.
How often should I get this test?
Your doctor will determine the frequency based on your health status, medications, and risk factors. Regular monitoring may be recommended if you have diabetes or other metabolic conditions.
Can diet or exercise affect test results?
Yes, eating or exercising right before the test can influence results. Follow your doctor’s instructions to ensure accurate readings, such as fasting if required.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy