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Total Serum Cholesterol (Mass Concentration)

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

This test measures the total amount of cholesterol in your blood serum. Cholesterol is a type of fat that your body needs for healthy cell function but also plays a role in heart health.

Quick summary

["Your cholesterol level helps assess your risk for heart disease and other health conditions."]

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

Key facts at a glance

LOINC
56255-3
Short code
Whole Egg IgG4-mCnc
Synonyms
Whole Egg IgG4-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 It Matters in Your Health

Cholesterol is essential for maintaining cell membranes and producing hormones, but high levels can build up in your arteries, increasing the risk of blockages that may lead to heart attacks or strokes. This test helps doctors monitor your overall cholesterol status.

How the Test Works

Blood is drawn from a vein in your arm and sent to a lab. The lab uses a chemical process to measure the total cholesterol in the serum portion of your blood. Results are typically reported in milligrams per deciliter (mg/dL).

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 9–12 hours before the test if your doctor recommends it. This helps ensure more accurate results for cholesterol levels.

Possible Results and Interpretation

While specific reference ranges vary by lab, doctors often use general guidelines to interpret results. For example, lower-than-normal levels may indicate a need for dietary changes or supplements, while higher-than-normal levels may prompt lifestyle adjustments or medical interventions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Cholesterol Level

Frequently asked questions

What does a high cholesterol level mean for my health?
High cholesterol can increase your risk of developing heart disease, stroke, or peripheral artery disease. Your doctor may recommend lifestyle changes, medications, or further testing if your cholesterol levels are elevated.
Can low cholesterol levels cause problems?
Very low cholesterol levels can sometimes be linked to deficiencies in nutrients like vitamin D or other essential fats, but they are less commonly associated with serious health risks than high cholesterol. Always discuss results with your healthcare provider.
How often should I get this test?
Your doctor will determine how often you need cholesterol testing based on your age, medical history, and risk factors. Typically, adults with no risk factors may get tested every 4–5 years, while those with risk factors may need testing more frequently.
  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