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Glucose, Serum (Mass Concentration)

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

This test measures the amount of glucose, a type of sugar, in your blood serum. It helps assess your blood sugar levels.

Quick summary

["Glucose levels can indicate how well your body is managing energy and may signal diabetes or other metabolic conditions."]

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

Key facts at a glance

LOINC
50218-7
Short code
Glucose sp9 SerPl-mCnc
Synonyms
Glucose sp9 SerPl-mCnc
Category
glucose
Sample
serum
Container
Red-top tube (SST)
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
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test to check for diabetes, monitor blood sugar control in people with diabetes, diagnose conditions like hypoglycemia (low blood sugar), or evaluate metabolic health. It can also be used during pregnancy to screen for gestational diabetes.

What to Expect Before the Test

No special preparation is needed for this test. You may be asked to fast for 8–12 hours before the test if it’s part of a glucose tolerance test, but this is not always required for a simple serum glucose measurement. Bring any medications you’re taking to your appointment.

What Happens During the Test?

A healthcare professional will draw blood from a vein in your arm using a small needle. You may feel a brief pinch, but it usually doesn’t cause significant discomfort. The blood sample is then sent to a lab for analysis.

What Are the Results?

Results are typically reported in milligrams per deciliter (mg/dL). Your results will be reviewed by your healthcare provider to determine if they fall within normal ranges or if further action is needed.

Reference range

Fasting: 70-100 mg/dLN/A

Specimen: serum

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

Serum Glucose

Frequently asked questions

How often should I get this test?
The frequency depends on your health status. People without diabetes may get this test occasionally for general health checks, while those with diabetes may need it monthly or more often to track progress.
Can I eat or drink before this test?
For a routine serum glucose test, you can eat and drink normally. If it’s part of a glucose tolerance test, fasting is usually required, but ask your provider for specifics.
What if my results are outside the normal range?
If your results are high, your provider may recommend lifestyle changes (like diet and exercise), medications, or further testing. If low, they may suggest dietary adjustments or monitoring for hypoglycemia triggers.
  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