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LDL Cholesterol, Calculated from Apolipoprotein B, Serum/Plasma

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

This blood test estimates LDL cholesterol using apolipoprotein B (ApoB), a marker of cholesterol-carrying particles that contribute to arterial plaque.

Quick summary

["ApoB-based calculated LDL estimates cardiovascular risk and may differ from the LDL result produced by a standard lipid panel."]

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

Key facts at a glance

LOINC
44711-0
Short code
LDLc/Apo B SerPl
Synonyms
LDLc/Apo B SerPl
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?

This test estimates LDL cholesterol from apolipoprotein B (ApoB), a protein found in certain cholesterol-carrying lipoproteins. The result is derived from a blood sample rather than being the same calculation used by most standard lipid panels.

Why might I need this test?

It may be used to estimate cardiovascular risk when standard LDL and ApoB results do not agree or when triglycerides are elevated. It can also help clinicians assess the number of atherogenic, cholesterol-carrying particles.

How is the test performed?

A blood sample is collected, and ApoB is measured in the laboratory. The laboratory then uses a validated calculation to estimate LDL cholesterol. This is a calculated result and is not interchangeable with a directly measured LDL cholesterol value.

How do I prepare for the test?

Fasting is not generally required for ApoB measurement unless your clinician requests it or it is being checked with other tests that require fasting. Follow any specific instructions from your healthcare provider.

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

ApoB-Calculated LDL Cholesterol

Frequently asked questions

Is this the same as LDL cholesterol from a routine lipid panel?
No. This result uses an ApoB-based calculation, while routine LDL cholesterol is usually calculated from total cholesterol, HDL cholesterol, and triglycerides. The two values can differ.
Why might ApoB-based LDL be used instead of standard LDL?
It may be helpful when triglycerides are high or when standard LDL and ApoB results do not agree. ApoB more directly reflects the number of atherogenic particles.
What does a high result mean?
A high result may indicate an increased concentration of cholesterol-carrying particles and a higher long-term risk of atherosclerotic cardiovascular disease. Your clinician can interpret it alongside your other risk factors.
  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