Skip to content

Glucose in Whole Blood by Enzymatic Method

Published: August 9, 2026Updated: August 17, 2026

This test measures the amount of glucose (sugar) in your blood, which helps monitor blood sugar levels.

Quick summary

["Glucose levels are critical for managing conditions like diabetes."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
49926-9
Short code
G6PD RBC WHO method-cCnt
Synonyms
G6PD RBC WHO method-cCnt
Category
glucose
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
4.2
Ref high
5.9
Critical range
2 N/A – 7 N/A
Fasting
true
Population
adult
Sex
all
Age range
18–65 years
Method
who-method
CPT
85041
SNOMED
900000000000003001
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 Is This Test Done?

Your healthcare provider may order this test to check for high or low blood sugar, diagnose diabetes, or monitor treatment progress. It’s often used in emergency settings or during routine check-ups.

How Is the Sample Collected?

A small amount of blood is drawn from a vein, usually in your arm, using a needle. The blood sample is then sent to the lab for testing.

What Do Results Mean?

Results provide a snapshot of your blood sugar at the time of testing. While specific ranges vary by lab, abnormal results may signal conditions like hypoglycemia (low blood sugar) or hyperglycemia (high blood sugar).

Common Conditions Monitored

This test is commonly used to diagnose or manage diabetes, track blood sugar trends in people with prediabetes, or assess metabolic health in critical care situations.

Reference range

Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/A

Specimen: whole-blood

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Glucose levels are a key indicator of metabolic health. Persistently high or low levels can signal diabetes, insulin resistance, or other endocrine disorders. Frequent monitoring helps prevent complications like nerve damage, kidney issues, or cardiovascular risks.

Short name

Whole Blood Glucose

Frequently asked questions

How often will I need this test?
Frequency depends on your health condition. People with diabetes may need this test weekly, monthly, or more often as directed by their doctor. Emergency or routine check-ups may also require it.
What should I do if my blood sugar is too high or too low?
If your results are abnormal, follow your healthcare provider’s instructions for immediate action, such as adjusting diet, medication, or lifestyle changes. Never ignore symptoms like dizziness, confusion, or excessive thirst.
Can I eat or drink before this test?
For whole blood glucose tests, fasting is not required, but timing may vary by lab. Ask your provider or lab technician for specific instructions, as some tests may be affected by food or drink.
  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 17, 2026. · Read our editorial policy