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Glucose, Blood, Whole Blood, Mass Concentration

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

This test measures the amount of glucose (sugar) in your blood, typically taken from a sample of whole blood.

Quick summary

["Glucose levels help monitor blood sugar and identify potential diabetes or other metabolic conditions."]

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

Key facts at a glance

LOINC
100746-7
Short code
Glucose BldMV-sCnc
Synonyms
Glucose BldMV-sCnc
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
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 glucose testing is essential for managing conditions like diabetes, where keeping levels stable prevents complications such as nerve damage, kidney issues, or heart disease. It also helps detect prediabetes or insulin resistance early.

When You Might Need It

Your healthcare provider may order this test if you have symptoms like excessive thirst, frequent urination, unexplained weight changes, fatigue, or recurring infections. It’s also part of routine check-ups for people at higher risk of diabetes.

How the Test Works

A small blood sample is drawn from your arm or finger. The sample is analyzed to determine the concentration of glucose in your blood. The test is usually done quickly in a lab using an automated method.

What to Expect Before the Test

For most people, fasting is not required, but if you’re checking for diabetes-related causes, your provider may ask you to fast overnight. Wear comfortable clothing and bring any medications you’re currently taking.

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

Short name

Glucose Level

Frequently asked questions

What Does a High Glucose Level Mean?
If your glucose level is consistently higher than expected, it may signal diabetes or insulin issues. Your doctor will discuss next steps, such as adjusting medications or monitoring trends over time.
What Does a Low Glucose Level Mean?
Low glucose (hypoglycemia) can cause symptoms like shakiness, dizziness, or confusion. If you experience these, eat a quick source of sugar (e.g., fruit juice or candy) and contact your provider if symptoms persist.
Do I Need to Fast Before This Test?
Most glucose tests do not require fasting unless specified by your provider. If fasting is needed, follow their instructions carefully to ensure accurate results.
  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