Calculated LDL Cholesterol, Derived from Total Cholesterol, HDL Cholesterol, and Triglycerides
A calculated estimate of LDL cholesterol derived from total cholesterol, HDL cholesterol, and triglyceride results, usually reported as part of a lipid profile.
["This test estimates how much potentially harmful cholesterol is carried in LDL particles."]
Key facts at a glance
- LOINC
- 36172-5
- Short code
- CT Thigh W contr IV
- Synonyms
- CT Thigh W contr IV
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ct
- 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?
Calculated LDL cholesterol estimates the amount of cholesterol in low-density lipoprotein particles. It is derived from other lipid measurements rather than measured directly.
Why might I need this test?
This result is commonly used to assess cardiovascular risk and guide treatment decisions. It may be included in a lipid profile or calculated when results for total cholesterol, HDL cholesterol, and triglycerides are available.
How is the test performed?
A laboratory analyzes a blood sample for total cholesterol, HDL cholesterol, and triglycerides. It then uses these results in a standard formula to estimate LDL cholesterol, which may appear directly on the laboratory report.
How do I prepare for the test?
Follow your clinician's or laboratory's fasting instructions. Fasting is often requested for a standard lipid profile, particularly when triglycerides are being evaluated, but it may not be required in every situation.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
An elevated calculated LDL result can indicate an increased burden of cholesterol carried by LDL particles, which is associated with greater atherosclerotic cardiovascular risk. When triglycerides are markedly elevated, the standard calculation may be less reliable and a direct LDL measurement may be considered. Interpretation should account for your overall risk factors, medical history, medications, and other lipid results.
Short name
Calculated LDL Cholesterol
Frequently asked questions
Is calculated LDL cholesterol the same as a direct LDL test?
Do I need to fast for this test?
What can affect the calculated LDL result?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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