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Glucose in Serum (Mass Concentration)

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

This test measures the amount of glucose (sugar) present in your blood serum. It helps monitor blood sugar levels, often used in diabetes management.

Quick summary

["A simple blood test to check your blood sugar levels."]

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

Key facts at a glance

LOINC
58850-9
Short code
GH sp14 SerPl-mCnc
Synonyms
GH sp14 SerPl-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
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 diagnose or manage conditions like diabetes, to check for high or low blood sugar, or to monitor treatment effectiveness. It can also be used during pregnancy to assess fetal health or in emergency situations to evaluate shock or dehydration.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it’s part of a glucose tolerance test. Wear comfortable clothing and bring any medications you’re currently taking. Avoid smoking before the test.

How the Test Is Performed

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

What the Results Mean

Results are typically reported in milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L). While exact ranges vary by lab, higher or lower than expected levels may signal diabetes, hypoglycemia, or other metabolic issues. Your doctor will interpret results in the context of your overall health.

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 condition. People with diabetes may need tests every few months, while others may only need occasional checks. Your doctor will determine the best schedule for you.
What can affect my test results?
Fasting status, stress, illness, certain medications (like insulin or steroids), or recent food intake can influence results. If you’re unsure about your preparation, discuss it with your healthcare provider.
What if my results are out of the expected range?
If your results are abnormal, your doctor will review them with you and may recommend further testing or adjustments to your treatment plan. Follow-up visits are important to address any concerns and ensure your health is stable.
  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