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Cholesterol, Plasma — Mass Concentration

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

A blood test that measures the amount of cholesterol in plasma to help assess cardiovascular risk and guide treatment.

Quick summary

["This test measures blood cholesterol, which is an important factor in heart and blood vessel disease risk."]

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

Key facts at a glance

LOINC
9618-0
Short code
Cholest Plr-mCnc
Synonyms
Cholest Plr-mCnc
Category
lipid
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

What is this test?

This test measures the total amount of cholesterol in plasma, the liquid portion of blood. It is commonly used to help evaluate the risk of heart attack, stroke, and other cardiovascular problems.

Why might I need this test?

You may need this test as part of a routine health screening, to monitor cholesterol treatment, or if you have risk factors for cardiovascular disease. Your clinician may also order it when symptoms or medical history suggest a need to assess your cholesterol level.

How is the test performed?

A healthcare professional draws a blood sample, usually from a vein in your arm. The laboratory separates the plasma and measures its cholesterol content. No special equipment is needed at home, and the sample is analyzed by the laboratory.

How do I prepare for the test?

Follow any instructions provided by your clinician. Some cholesterol tests may be requested after an overnight fast, while others do not require fasting. Continue taking medications unless your clinician tells you otherwise.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Cholesterol

Frequently asked questions

Does this test require fasting?
It depends on the test and your clinician's instructions. Fasting for about 9 to 12 hours is commonly requested for some cholesterol measurements, but some tests can be performed without fasting.
Is this the same as a full lipid panel?
Not necessarily. This test measures total cholesterol in plasma, while a lipid panel also measures HDL, LDL, and triglycerides. Your clinician may order both or use another form of the cholesterol test to assess overall risk.
Can medications or supplements affect the result?
Yes. Cholesterol-lowering medicines, some other medicines, and dietary supplements may affect the result. Tell the healthcare professional about anything you take, but do not stop prescribed treatment without medical advice.
  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