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Glucose in Whole Blood (Concentration)

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

This test measures the amount of glucose, a type of sugar, present in your blood. It helps doctors monitor blood sugar levels, especially important for managing conditions like diabetes.

Quick summary

["This test checks your blood sugar levels to help prevent complications from high or low blood sugar."]

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

Key facts at a glance

LOINC
15074-8
Short code
Glucose Bld-sCnc
Synonyms
Glucose Bld-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 Is Done

Doctors may order this test to diagnose or monitor conditions such as diabetes, hypoglycemia (low blood sugar), or to check for signs of metabolic issues. It’s also used during pregnancy to screen for gestational diabetes or before surgeries to assess blood sugar stability.

How the Test Works

A small sample of your blood is taken, usually from a vein in your arm. The lab then measures the glucose concentration using an enzymatic method, which detects the sugar’s presence through chemical reactions.

What to Expect Before the Test

No special preparation is needed for this test, but if you’re taking diabetes medications, you may need to check with your doctor first. Avoid eating or drinking anything (except water) for at least 8 hours before the test if instructed, as fasting can affect results.

What to Expect During the Test

The test is quick and painless. A healthcare provider will insert a small needle into your arm to draw blood. You may feel a slight pinch, but the procedure usually takes only a few minutes.

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 (Blood)

Frequently asked questions

How often should I get this test?
The frequency depends on your health condition. People with diabetes typically get this test every few months to a year, while others may need it less often or only as needed for diagnosis or management.
What do my results mean?
Results are usually reported in milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L). Your doctor will interpret the results in relation to your health and any symptoms you have. Normal ranges can vary by lab and individual needs.
Can I eat or drink before this test?
Check with your doctor or lab technician about fasting requirements. Some tests require fasting (no food or drink except water) for 8–12 hours before drawing blood, while others do not. Always follow their specific instructions.
  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