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Glucose, Serum (Mass Concentration)

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

This test measures the amount of glucose (sugar) in your blood drawn from a vein in your arm. It helps doctors check how well your body is using sugar for energy.

Quick summary

["This test helps monitor blood sugar levels, especially important for managing diabetes or other conditions affecting metabolism."]

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

Key facts at a glance

LOINC
48984-9
Short code
Glucose 10M p Glc SerPl-mCnc
Synonyms
Glucose 10M p Glc 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?

Doctors order this test to diagnose or monitor conditions like diabetes, track blood sugar trends, or assess how your body processes sugar. It may also be used before surgeries or during pregnancy to ensure stable glucose levels.

What Does the Test Involve?

You’ll have a small needle inserted into your arm to draw blood. The sample is sent to a lab where it’s analyzed to measure glucose concentration. The process usually takes a few minutes.

What to Expect Before the Test

No special preparation is needed unless instructed by your doctor. You may eat or drink normally unless your provider specifies otherwise. Wear comfortable clothing that allows easy access to your arm.

What to Expect After the Test

You’ll feel minor discomfort or bruising at the needle site, which typically fades quickly. Apply gentle pressure to stop any bleeding. Avoid vigorous activity for a short time to prevent bruising.

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 expect this test?
The frequency depends on your health condition. If you have diabetes, your doctor may recommend testing every few months or more often to monitor progress. Others may only need it once or twice a year unless symptoms arise.
What do my results mean?
Results are compared to a general reference range, but your doctor will interpret them in the context of your health history and symptoms. You’ll discuss findings with your provider to understand what actions, if any, are needed.
Can I eat or drink before this test?
Typically, you can eat and drink normally unless your doctor specifies fasting. Some tests require fasting, but this glucose test does not.
  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