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Serum or plasma mass concentration of low-density lipoprotein cholesterol (LDL-C)

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

This test measures the amount of cholesterol carried by low-density lipoprotein (LDL) particles in your blood. LDL cholesterol is often called 'bad cholesterol' because high levels can contribute to plaque buildup in your arteries.

Quick summary

["LDL cholesterol helps assess your risk for heart disease by identifying high levels that may need lifestyle or medical attention."]

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

Key facts at a glance

LOINC
24674-4
Short code
MR Elbow
Synonyms
MR Elbow
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mr
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

LDL cholesterol is a key part of your lipid (fat) profile, which includes other types of cholesterol like HDL ('good cholesterol') and triglycerides. High LDL levels can increase your risk of heart disease and stroke by narrowing your arteries over time.

What to Expect Before the Test

You may be asked to fast for 8–12 hours before this test, depending on your lab’s protocol. If you’re not fasting, your results may be less accurate. Bring any medications you’re currently taking, as some can affect cholesterol levels.

What the Results Mean

Results are typically reported alongside your total cholesterol and HDL levels. While exact ranges vary by lab, high LDL levels (often above 100 mg/dL) may prompt further evaluation or treatment recommendations.

Common Causes of High LDL

High LDL can result from genetics, poor diet (high in saturated fats), lack of exercise, obesity, or certain medical conditions like diabetes or hypothyroidism. Smoking and excessive alcohol use may also contribute.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

LDL Cholesterol Level

Frequently asked questions

How often do I need this test?
Your doctor may recommend LDL cholesterol testing every 1–5 years, depending on your overall heart health risk. If you have risk factors (like high blood pressure or a family history of heart disease), testing may be more frequent.
What if my LDL is too high?
If your LDL is elevated, your doctor might suggest lifestyle changes (like diet and exercise) or medications (such as statins) to lower it. Follow-up tests will help track progress.
Does diet affect LDL results?
Yes! Eating more fruits, vegetables, whole grains, and healthy fats (like olive oil) while limiting saturated and trans fats can help lower LDL naturally.
  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