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Serum/Plasma Substance Concentration by Immunoassay (Glucose)

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

This test measures the amount of glucose (sugar) in your blood serum or plasma. It helps monitor blood sugar levels, often used in diabetes management or to check for conditions like hypoglycemia or hyperglycemia.

Quick summary

["A simple way to track your blood sugar, useful for managing diabetes or detecting sugar-related health issues."]

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

Key facts at a glance

LOINC
100995-0
Short code
Laceyella sacchari IgG Ser Ql
Synonyms
Laceyella sacchari IgG Ser Ql
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 This Test Matters

Glucose is your body’s primary energy source. High or low levels can cause serious health problems, such as nerve damage, kidney issues, or even heart disease. Regular monitoring helps prevent complications and keeps you in control of your health.

How the Test Works

Blood is drawn from a vein, usually in your arm. The sample is then tested using an immunoassay method to detect glucose levels. This method is quick, accurate, and non-invasive.

What to Expect Before the Test

You may be asked to fast for 8–12 hours before the test if it’s part of a fasting glucose panel. Otherwise, you can eat and drink normally. Wear comfortable clothing and bring any medications you’re currently taking.

What to Expect During the Test

A healthcare professional will insert a small needle into your vein to draw blood. You may feel a slight pinch, but it usually takes only a few seconds. The process is quick, and you can sit or lie down while it happens.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Glucose levels can indicate whether you have diabetes, prediabetes, or insulin resistance. Persistently high glucose may signal diabetes, while very low levels can cause dizziness, confusion, or fainting. Regular monitoring helps doctors adjust treatments and prevent long-term damage.

Short name

Glucose Level

Frequently asked questions

How often should I get this test?
The frequency depends on your health condition. If you have diabetes, your doctor may recommend testing every few months or more often. Others may need it only once yearly or as part of routine check-ups.
What do my results mean?
Your results will be compared to standard ranges. If your levels are consistently high or low, your doctor may recommend further testing or changes to your treatment plan.
Can I eat or drink before this test?
If fasting is required, avoid food and liquids (except water) for the specified time. If not fasting, eat a normal meal and drink water as usual.
  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