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Glucose in Serum (Plasma) – Glucose Level

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

This test measures the amount of glucose (sugar) in your blood, typically drawn from a vein in your arm. Glucose levels help monitor blood sugar control, especially important for people with diabetes.

Quick summary

["A simple blood test to check your blood sugar levels and support diabetes management."]

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

Key facts at a glance

LOINC
58089-4
Short code
G6PD DBS-Imp
Synonyms
G6PD DBS-Imp
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 This Test Matters

Glucose is the primary energy source for your body’s cells. High or low blood sugar can cause serious health issues, including nerve damage, heart disease, or even coma in extreme cases. Regular monitoring helps prevent complications and adjusts treatment plans like medication or diet.

How the Test Works

Your blood sample is collected and analyzed using an automated method that detects glucose levels. The test may be performed on fresh blood or stored plasma, depending on the lab’s protocol.

What to Expect Before the Test

You may be asked to fast (not eat or drink) for 8–12 hours before the test if it’s part of a fasting glucose panel. Otherwise, you can eat and drink normally. Wear loose clothing for easy access to your arm.

What to Expect During the Test

A healthcare provider will clean your arm with an antiseptic, insert a small needle to draw blood, and collect a few drops. The process usually takes just a few minutes. You may feel a brief pinch, but most people tolerate it well.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum/Plasma Glucose

Frequently asked questions

How often should I get this test?
The frequency depends on your health status. People without diabetes may get a routine glucose test every few years, while those with diabetes typically check it monthly or more often as directed by their healthcare provider.
What do my results mean?
Results are usually reported as a numerical value (e.g., mg/dL or mmol/L). Your doctor will interpret them in relation to your medical history and symptoms. If results are outside normal ranges, follow-up tests or additional evaluations may be needed.
Can lifestyle changes affect this test?
Yes! Eating a balanced diet, staying physically active, managing stress, and avoiding excessive alcohol can help stabilize blood sugar levels. If you’re taking medications, always discuss potential interactions with your doctor before making changes.
  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