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Serum or plasma mass concentration of glucose

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

This test measures the amount of glucose (sugar) in your blood, typically drawn from a vein or collected in a tube.

Quick summary

["Glucose levels help monitor blood sugar and identify diabetes or other metabolic conditions."]

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

Key facts at a glance

LOINC
55516-9
Short code
GH 1.5h p Gc SerPl-mCnc
Synonyms
GH 1.5h p Gc 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 check for diabetes, monitor blood sugar control in people with diabetes, or evaluate conditions like hypoglycemia (low blood sugar) or liver/kidney disease. It can also help assess how well medications are working.

What to Expect Before the Test

You may be asked to fast (not eat) for 8–12 hours before the test, especially if it’s a fasting glucose check. If you’re pregnant, have diabetes, or take certain medications, let your provider know. The test is usually done by a vein in your arm.

What Happens During the Test?

A healthcare professional will insert a small needle into your arm to draw blood. You may feel a slight pinch, but it’s quick. The blood sample is sent to a lab for analysis.

What Do Results Mean?

Results are compared to general reference ranges, but your provider will interpret them in the context of your health history and symptoms. High or low readings may signal underlying issues that need further evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Glucose levels outside normal ranges can indicate diabetes (high blood sugar), hypoglycemia (low blood sugar), or other metabolic disorders. Frequent monitoring is critical for people with diabetes to prevent complications like nerve damage, heart disease, or kidney problems.

Short name

Glucose Level

Frequently asked questions

How often should I get this test?
Frequency depends on your health status. People without diabetes may get it once or twice a year, while those with diabetes may need monthly or quarterly checks.
What can affect my test results?
Fasting, exercise, stress, illness, or certain foods/drinks (like sugary drinks) can influence results. If you’re unsure about your preparation, ask your provider.
Can I eat or drink before this test?
For fasting tests, avoid food and liquids (except water) for the specified period. If it’s a non-fasting test, follow your provider’s instructions.
  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