Skip to content

Intermediate-Density Lipoprotein Cholesterol, Serum/Plasma — Mass Concentration

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

Measures the amount of cholesterol in intermediate-density lipoprotein particles, which transport cholesterol between HDL and LDL.

Quick summary

["IDL cholesterol helps assess cardiovascular risk and how the body handles cholesterol-rich particles."]

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

Key facts at a glance

LOINC
2087-5
Short code
IDLc SerPl-mCnc
Synonyms
IDLc SerPl-mCnc
Category
lipid
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 this test?

This blood test measures intermediate-density lipoprotein (IDL) cholesterol. IDL is a lipoprotein particle that carries cholesterol and triglycerides through the bloodstream and sits between HDL and LDL in size.

Why might I need this test?

IDL cholesterol may be measured as part of a lipid profile or when assessing cardiovascular risk. It can also help evaluate how the body processes cholesterol-containing particles, especially in people with high triglycerides or a family history of early heart disease.

How is the test performed?

A blood sample is drawn from a vein and analyzed in the laboratory. The result is usually reported as the concentration of cholesterol in IDL, commonly in milligrams per deciliter or millimoles per liter.

How do I prepare for the test?

Follow your clinician's instructions. IDL is often measured with other lipids, and fasting may be requested for the complete lipid profile; do not fast unless you have been specifically told to do so.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IDL cholesterol

Frequently asked questions

Is IDL cholesterol the same as LDL cholesterol?
No. IDL and LDL are different classes of cholesterol-carrying particles. IDL is richer in triglycerides, while LDL carries a greater proportion of cholesterol.
Does an abnormal IDL result mean I have a disease?
No. An abnormal result does not diagnose a disease by itself. Your clinician will consider it along with triglycerides, HDL and LDL cholesterol, other tests, and your cardiovascular risk factors.
Do I need to fast for this test?
Fasting may be required if IDL cholesterol is being measured with a standard lipid profile, but it is not always necessary. Follow the preparation instructions provided by your clinician or laboratory.
  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