Total Cholesterol (Serum)
This test measures the total amount of cholesterol in your blood, which includes both the cholesterol your body makes and the cholesterol from foods you eat. Cholesterol is important for cell function but can build up in your arteries if levels are too high.
["Your cholesterol level helps assess your risk for heart disease and stroke."]
Key facts at a glance
- LOINC
- 36026-3
- Short code
- CT Upper arm-Bl
- Synonyms
- CT Upper arm-Bl
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ct
- 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
Cholesterol is a type of fat that your body needs to work properly, but high levels can clog your arteries over time, increasing your risk of heart problems. This test helps doctors monitor your heart health and guide treatment if needed.
What to Expect Before the Test
You may have this test drawn from a blood sample taken from your arm. No special preparation is usually needed, but you might be asked to fast (not eat or drink) for 12 hours before the test if it’s part of a lipid panel.
How the Results Are Used
Your doctor will compare your cholesterol level to healthy ranges and discuss it with you. They may recommend lifestyle changes, diet adjustments, or medications if your results suggest an increased risk for heart disease.
Common Causes of High or Low Cholesterol
High cholesterol can be influenced by diet, genetics, weight, or lack of exercise. Low cholesterol may occur due to certain medical conditions, medications, or diet. Your doctor will consider all factors when interpreting your results.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
High cholesterol can increase the risk of heart disease, stroke, or peripheral artery disease by promoting plaque buildup in arteries. Low cholesterol may raise concerns about nutrient deficiencies or underlying health conditions, depending on the context.
Short name
Cholesterol Level
Frequently asked questions
What does a high cholesterol level mean?
How can I lower my cholesterol naturally?
Do I need to fast before this test?
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