Serum or Plasma Glucose (Mass Concentration) – Quantitative Measurement
This test measures the amount of glucose (sugar) in your blood, typically drawn from a vein or collected in a serum or plasma tube.
["Glucose levels help assess blood sugar balance and identify risks for diabetes or other metabolic conditions."]
Key facts at a glance
- LOINC
- 58881-4
- Short code
- GH sp26 SerPl-mCnc
- Synonyms
- GH sp26 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
What Is Glucose Testing Used For?
Glucose testing is commonly used to diagnose diabetes, monitor blood sugar levels in people with diabetes, and check for conditions like hypoglycemia (low blood sugar). It may also be part of routine health screenings or during pregnancy (e.g., gestational diabetes).
How Is This Test Performed?
A healthcare provider will draw blood from a vein in your arm using a small needle. The blood sample is then processed into either serum (after clotting) or plasma (liquid portion after centrifugation). The glucose level is measured using an automated laboratory method, often an enzymatic assay, which detects sugar content precisely.
What Does a Glucose Test Tell You?
Results help determine whether your blood sugar is too high, too low, or within a normal range. Abnormal results may prompt further testing or adjustments to diet, medication, or lifestyle.
When Might You Need This Test?
You may need this test if you have symptoms like excessive thirst, frequent urination, unexplained weight changes, fatigue, or if you have a family history of diabetes. Doctors also order it during routine checkups, before surgeries, or during pregnancy.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Chronically high glucose levels can damage blood vessels, nerves, and organs over time, increasing risks for heart disease, kidney problems, or nerve damage. Persistently low levels may cause dizziness, confusion, or fainting. Regular monitoring helps manage these risks effectively.
If you experience pain, swelling, or bruising at the injection site, inform your doctor. Otherwise, the procedure is usually quick and well-tolerated. Results are usually available within 24–48 hours, depending on lab processing times.
No, this test does not require special preparation beyond fasting if instructed. If you are pregnant, have kidney disease, or take certain medications (like steroids), your doctor may recommend adjustments.
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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