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Glucose, measured in plasma by enzymatic method

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

This test checks the amount of glucose (sugar) in your blood plasma, which helps assess how your body uses energy and manages blood sugar levels.

Quick summary

["A simple blood test to monitor blood sugar levels for diabetes management or metabolic health."]

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

Key facts at a glance

LOINC
1538-8
Short code
Glucose 4h p 100 g Glc PO Ur-mCnc
Synonyms
Glucose 4h p 100 g Glc PO Ur-mCnc
Category
glucose
Sample
urine
Container
Sterile urine container
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
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Matters

Glucose is your body’s primary energy source, derived from food. High or low levels can cause serious health issues, such as nerve damage, heart disease, or even coma. Regular monitoring helps prevent these risks and ensures proper treatment of conditions like diabetes.

How the Test Works

A small blood sample is taken from your arm and sent to a lab. There, an enzymatic method detects glucose by measuring how it reacts with specific enzymes, providing an accurate measurement of your plasma glucose concentration.

What to Expect Before the Test

No special preparation is needed for this test. However, if you’re fasting for another test, inform your healthcare provider. Wear comfortable clothing and bring any medications you’re taking.

Possible Results and Interpretation

Results are typically reported in milligrams per deciliter (mg/dL). A normal range varies by lab and individual, but values outside this range may signal diabetes, hypoglycemia, or other metabolic disorders. Your doctor will discuss results with you.

Reference range

Fasting: 70-100 mg/dLN/A

Specimen: urine

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.

Clinical Significance

Short name

Plasma Glucose

Frequently asked questions

What could cause abnormal results?
Abnormally high glucose levels may indicate diabetes, poor insulin function, or conditions like pancreatitis or dehydration. Low levels can signal hypoglycemia, severe infections, or certain medications. Always consult your doctor for personalized interpretation.
How often should I get this test?
The frequency depends on your health status. People with diabetes may test regularly (e.g., daily or weekly), while others may need it less often—typically every few months or annually. Follow your healthcare provider’s recommendations.
Can lifestyle changes affect this test?
Yes! Diet, exercise, and medications can impact glucose levels. If you’ve made significant lifestyle changes, discuss them with your doctor before or after your test 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