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Cholesterol (Total) in Serum

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

This test measures the total amount of cholesterol in your blood serum, a key indicator of heart health and lipid metabolism.

Quick summary

["Total cholesterol helps assess your risk for cardiovascular disease by evaluating your fat levels in the blood."]

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

Key facts at a glance

LOINC
23257-9
Short code
M cap capric Ab Ser Ql IA
Synonyms
M cap capric Ab Ser Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 waxy substance that your body needs to build healthy cells, but having too much can clog your arteries over time. High cholesterol increases your risk of heart disease or stroke. This test helps doctors monitor your cholesterol levels to guide lifestyle changes or treatment if needed.

What to Expect Before the Test

No special preparation is usually required, but you may be asked to fast for 9–12 hours before the test if it’s part of a lipid panel. Your blood will be drawn from a vein in your arm, similar to other blood tests. The process takes a few minutes and is generally comfortable.

How the Results Are Used

Your doctor will review your total cholesterol result alongside other lipid measurements (like HDL, LDL, and triglycerides) to assess your overall heart health. They may recommend dietary adjustments, exercise, or medication if your levels are elevated.

Common Causes of Abnormal Results

High cholesterol can result from genetics, poor diet (high in saturated or trans fats), lack of physical activity, obesity, or certain medical conditions (e.g., diabetes). Low cholesterol may be due to healthy lifestyle habits or rare genetic factors.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Total Cholesterol

Frequently asked questions

What does a ‘high’ or ‘low’ total cholesterol mean?
A ‘high’ total cholesterol (typically above 200 mg/dL) increases your risk of plaque buildup in arteries. A ‘low’ total cholesterol (below 160 mg/dL) is often associated with healthier heart function, but this depends on other lipid factors and overall health.
Do I need this test if I already have healthy cholesterol levels?
Even if your cholesterol is in a normal range, doctors may recommend periodic testing (every 4–6 years) to catch changes early. Regular monitoring helps adjust lifestyle or treatment plans as needed.
Can diet or exercise change my cholesterol test results?
Yes! Reducing saturated fats, increasing fiber (from fruits, vegetables, and whole grains), and staying active can lower cholesterol. Small, consistent changes often yield the best results over time.
  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