Overview
Non-HDL-C = total cholesterol − HDL-C and estimates all apoB-containing lipoprotein cholesterol.
Clinical Importance
Secondary lipid treatment target in many guidelines
Useful when calculated LDL is unreliable
Specimen Requirements
Calculated from total cholesterol and HDL-C.
- Specimen: serum or lithium heparin plasma (method- and analyzer-dependent; follow the performing laboratory)
- Tube: gold/SST (serum separator) or green-top lithium heparin as validated locally
- Handling: invert gently; allow SST to clot fully before centrifugation; separate promptly
- Storage: refrigerate serum/plasma if testing is delayed per analyte stability limits
- Stability: analyte-specific; do not exceed institutional or manufacturer time/temperature limits
- Fasting: follow institutional/protocol fasting requirements when the ordered pathway requires fasting
Analytical Method
Arithmetic difference of measured total cholesterol and HDL-C.
Instruments Used
Automated analyzers
- LIS/chemistry calculators
Manual methods
- Manual subtraction
Reference Values
Typical adult SI examples below follow widely published international clinical chemistry practice (e.g., Tietz; Henry's). Always interpret against the method- and demographics-specific interval printed on the patient report (CLSI EP28-A3c). Neonatal, pediatric, pregnancy, and assay-generation intervals differ.
Guideline targets often sit ~0.8 mmol/L (30 mg/dL) above corresponding LDL goals; verify current lipid guideline tables.
Interpretation
Common Causes of Increased Results
- Elevated non-HDL reflects apoB particle burden
Common Causes of Decreased Results
- Lower non-HDL with therapy or low baseline lipids
Clinical Significance
- Lipid risk management when TG elevated
Factors Affecting Results
Pre-analytical
- Errors in total cholesterol or HDL
Analytical
- Propagated assay bias
Post-analytical
- Ignoring non-HDL when LDL calculation fails
Advantages and Limitations
Advantages
- Valid across a wide TG range
- No extra assay
Limitations
- Still not a particle number assay like ApoB
Clinical Pearls
When Friedewald LDL collapses, non-HDL (or ApoB) keeps the lipid conversation honest.
References
Authoritative textbooks, guidelines, and reviews supporting this laboratory test reference. Verify reference intervals, critical limits, and method details against institutional protocols and current guideline editions.
Textbooks
- Rifai N, Horvath AR, Wittwer CT, eds. Tietz Textbook of Clinical Chemistry and Molecular Diagnostics. 8th ed. Elsevier; 2022.
- McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Elsevier; 2021.
- Bishop ML, Fody EP, Schoeff LE. Clinical Chemistry: Principles, Techniques, and Correlations. 9th ed. Jones & Bartlett; 2022.
CLSI and Professional Guidelines
- International Federation of Clinical Chemistry and Laboratory Medicine (IFCC). Recommendations and reference measurement systems for clinical chemistry measurands (verify current IFCC documents for the analyte).
- Clinical and Laboratory Standards Institute. Defining, Establishing, and Verifying Reference Intervals in the Clinical Laboratory; Approved Standard. CLSI document EP28-A3c. CLSI; 2010.
- Clinical and Laboratory Standards Institute. Collection of Diagnostic Venous Blood Specimens. CLSI standard GP41. CLSI.
- American Diabetes Association. Standards of Care in Diabetes. Diabetes Care (annual update).
- Kidney Disease: Improving Global Outcomes (KDIGO). Clinical Practice Guideline for Evaluation and Management of Chronic Kidney Disease.
- American Association for the Study of Liver Diseases (AASLD). Practice guidance related to evaluation of abnormal liver chemistries / liver disease laboratory evaluation (verify current AASLD publication and institutional adoption).
- Grundy SM, et al. 2018 AHA/ACC Guideline on the Management of Blood Cholesterol. Circulation. 2019.
Frequently Asked Questions
Common questions about using this Non-HDL Cholesterol laboratory test Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Non-HDL Cholesterol laboratory test reference used for?
This Medical Laboratory Library page summarizes the clinical importance of Non-HDL Cholesterol. Review the Clinical Importance section for why the test is ordered in laboratory medicine practice.
Where can I find Non-HDL Cholesterol specimen requirements?
See the Specimen Requirements section on this page for specimen information related to Non-HDL Cholesterol. Confirm collection details against your laboratory protocol.
Where are Non-HDL Cholesterol reference values listed?
See the Reference Values section on this Laboratory Library page. Reference ranges can vary by method and population, so verify intervals with your laboratory.
How do I interpret Non-HDL Cholesterol results?
Use the Interpretation section for laboratory interpretation framing, including increased and decreased result patterns when provided. Do not treat educational text as a patient-specific diagnosis.
What analytical method is used for Non-HDL Cholesterol?
See the Analytical Method section for principle and method notes. Method details may differ by instrument and institutional SOP.
Are related laboratory tests linked from Non-HDL Cholesterol?
Yes. The Related Laboratory Tests section lists connected references for continued lookup in the Medical Laboratory Library.
How can I continue learning after reading Non-HDL Cholesterol?
Use Continue learning links on this page for related Academy lessons, medical laboratory quizzes, or laboratory case studies when available for this Clinical Chemistry topic.
What are the clinical pearls for Non-HDL Cholesterol?
See the Clinical Pearls section for concise laboratory practice notes associated with Non-HDL Cholesterol. Apply pearls alongside institutional protocols.
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