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Glucose in Serum or Plasma (Mass Concentration)

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

This test measures the amount of glucose (sugar) in your blood serum or plasma, a key indicator of blood sugar levels.

Quick summary

["Glucose levels help monitor diabetes and other metabolic conditions."]

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

Key facts at a glance

LOINC
63154-9
Short code
Cultivated Rye IgG-mCnc
Synonyms
Cultivated Rye IgG-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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, diagnose hypoglycemia (low blood sugar), or assess conditions like kidney disease or liver problems that can affect glucose metabolism.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast (not eat) for 8–12 hours before the test if it’s part of a fasting blood sugar panel. Bring any medications you’re currently taking.

How the Test Works

A healthcare professional will draw blood from a vein in your arm. The blood sample is then sent to a lab, where glucose levels are measured using an automated method, such as enzymatic analysis or chemiluminescence.

What the Results Mean

Results are typically reported in milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L). Your provider will interpret the results in relation to your medical history and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Glucose testing is critical for diagnosing and managing conditions like diabetes, where high or low levels can lead to serious health risks. It also helps track how well treatments (like insulin or diet) are working.

Short name

Serum/Plasma Glucose

Frequently asked questions

What causes abnormal glucose levels?
Factors like diet, exercise, stress, illness, or certain medications can temporarily affect glucose levels. Chronic conditions like diabetes or kidney disease may also influence results.
How often should I get this test?
Frequency depends on your health status. People with diabetes may need tests every few months, while others may only need occasional checks. Follow your provider’s recommendations.
Can I eat or drink before the test?
If fasting is required, avoid food and liquids (except water) for the specified time. If no fasting is needed, you can eat and drink normally, but avoid sugary drinks or snacks.
  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