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Glucose (Blood) – Quantitative Measurement

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

This test measures the amount of glucose (sugar) in your blood, typically drawn from a vein or fingerstick.

Quick summary

["Your blood sugar levels help manage energy and prevent complications like diabetes."]

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

Key facts at a glance

LOINC
104597-0
Short code
Glucose BldV Glucomtr-mCnc
Synonyms
Glucose BldV 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 Is Done

Doctors order glucose tests to check for conditions like diabetes, monitor blood sugar trends, or assess how your body processes sugar. It may also be used during pregnancy (gestational diabetes) or before certain treatments.

What to Expect Before the Test

You may be asked to fast (not eat) for 8–12 hours before the test, especially if fasting is required for accurate results. Bring any medications you’re taking. If you’re pregnant or have a history of blood clotting, let your provider know.

During the Test

A healthcare provider will insert a small needle into your arm or use a fingerstick to collect a blood sample. You may feel a brief pinch, but it’s usually over quickly. The test takes a few minutes.

After the Test

You can resume eating and drinking normally unless your provider instructed otherwise. Apply gentle pressure to the site to stop bleeding. Report any unusual swelling, redness, or signs of infection (e.g., increased pain, pus).

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.

◆Associated findings1

Frequently asked questions

How often should I get this test?
Your provider will determine the frequency based on your health needs—this could range from once a year to monthly, depending on your diagnosis or risk factors.
What does a ‘fasting’ glucose test mean?
A fasting test means you avoid eating or drinking (except water) for a set period before the blood draw to get an accurate measure of your baseline blood sugar levels.
Can I take my diabetes medication before the test?
Yes, but always follow your provider’s instructions. Some tests may require you to skip your usual dose, while others may not. Never stop taking medication without approval.
  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