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Calculated Low-Density Lipoprotein Cholesterol, Serum/Plasma — Mass Concentration

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

A calculated blood test that estimates LDL (“bad”) cholesterol from other lipid values to help assess cardiovascular risk.

Quick summary

["This test estimates LDL cholesterol, a blood lipid associated with the buildup of cholesterol in arteries."]

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

Key facts at a glance

LOINC
50194-0
Short code
IDLc+VLDL3c SerPl-mCnc
Synonyms
IDLc+VLDL3c SerPl-mCnc
Category
lipid
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
100
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
83721
SNOMED
113079007
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?

Low-density lipoprotein (LDL) cholesterol is often called “bad” cholesterol because high levels can contribute to fatty plaque buildup in arteries. A calculated LDL result is usually derived from the total cholesterol, HDL cholesterol, and triglyceride results in the same blood sample.

Why might I need this test?

This test is commonly used to assess cardiovascular risk and to monitor treatment intended to lower cholesterol. It may be ordered for screening, during a lipid panel, or when a person has a history of heart disease, stroke, diabetes, or high cholesterol.

How is the test performed?

A blood sample is drawn from a vein and analyzed for cholesterol and triglycerides. The laboratory then calculates the LDL value using a standard formula based on these results; this is not the same as directly measuring LDL particles in the blood.

How do I prepare for the test?

Follow the instructions provided by your clinician or laboratory. Fasting for 9 to 12 hours may be requested when this test is part of a lipid panel, although the laboratory may use a nonfasting calculation in some circumstances. Water is generally encouraged, and avoiding a heavy meal beforehand may help produce more consistent results.

Reference range

Optimal: <100 mg/dLN/A

Specimen: serum

Fasting for 12-14 hours preferred. Water is permitted. Avoid alcohol for 24 hours before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Calculated LDL Cholesterol

Frequently asked questions

Is calculated LDL cholesterol the same as a direct LDL test?
No. A calculated result is estimated from total cholesterol, HDL cholesterol, and triglycerides, while a direct test measures LDL in the blood. They can differ slightly, and a clinician may order a direct or repeat test if the calculated value is unexpected or the triglycerides are high.
Do I need to fast for this test?
Fasting may be required, depending on the laboratory's instructions and the reason for testing. If fasting is requested, it usually means avoiding food and drinks other than water for the period specified by your clinician.
How often should my LDL cholesterol be checked?
The interval depends on your cardiovascular risk, medical history, and whether you are taking cholesterol-lowering treatment. Your clinician can recommend a schedule based on your individual needs.
  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