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Glucose in 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. Glucose levels help doctors assess how well your body is using food for energy.

Quick summary

["Glucose levels can indicate how your body processes food 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
55507-8
Short code
GH 2h p Glc SerPl-mCnc
Synonyms
GH 2h p Glc SerPl-mCnc
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
true
Population
adult
Sex
all
Age range
18–65 years
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 levels, diagnose conditions like hypoglycemia, or evaluate how your body responds to medications or treatments.

What to Expect Before the Test

You may need to fast for 8–12 hours before the test, depending on your doctor’s instructions. Bring any medications you’re taking to your appointment.

How the Test Works

A small blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where glucose levels are measured using a specialized test.

What the Results Mean

Results help determine if your glucose levels are too high or too low. Your doctor will compare these results to your medical history and other tests to diagnose or manage a condition.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Glucose levels outside normal ranges can signal diabetes, prediabetes, or other metabolic disorders. High levels may require lifestyle changes or medication, while low levels could indicate insulin issues or other health risks.

Short name

Serum Glucose

Frequently asked questions

How often should I get this test?
Your doctor will decide how often you need this test based on your health needs. Regular checks may be recommended if you have diabetes, pregnancy, or other risk factors.
What can affect my glucose test results?
Fasting properly, avoiding alcohol or sugary foods before the test, and not smoking can help ensure accurate results. Certain medications or illnesses may also influence results.
What if my glucose level is abnormal?
If your results are outside the expected range, your doctor may recommend further testing or adjustments to diet, exercise, or medication to help manage your health.
  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