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[Recommendations for clinical-chemical departments: lipid-lipoprotein analysis]
J Dyerberg1, S Stender, G E Andersen
1Medicinsk Laboratorium a.s., København.
Insights
Danish medical societies recommend standardized lipid and lipoprotein analyses for better cardiovascular disease prevention. Key recommendations include specific cutoff values for cholesterol and triglycerides to guide clinical decisions.
Area of Science:
- Cardiology
- Clinical Chemistry
- Preventive Medicine
Context:
- A collaborative lipid group was formed by multiple Danish medical societies.
- Recommendations address lipid and lipoprotein analyses in clinical settings.
- Standardization is needed for accurate diagnostic interpretation.
Purpose:
- To establish guidelines for lipid and lipoprotein testing.
- To define optimal pre-analytical conditions and analytical performance.
- To recommend clinical decision cutoff values for key lipids.
Summary:
- The lipid group recommends specific tests: total cholesterol, triglycerides, HDL-cholesterol, and calculated LDL-cholesterol.
- Standardized procedures include patient positioning, rest periods, and multiple determinations.
- Analytical variation should be below 3%, with participation in external quality control.
Impact:
- Improved accuracy and reliability of lipid testing.
- Enhanced clinical decision-making based on standardized results.
- Facilitation of effective preventive cardiology strategies.
Abstract:
The section for preventive cardiology within the Danish Society for Cardiology has established a lipid group with representatives from The Danish Society for Clinical Chemistry, The Danish Society for Internal Medicine, The Danish Society for Cardiology, The Danish Society of Hypertension, The Danish College of General Practitioners, and The Danish Paediatric Society. The lipid group has elaborated recommendations for clinical chemical departments regarding lipid and lipoprotein analyses. The group suggests that doctors ordering lipid and lipoprotein analyses are offered the following: S-Cholesterol (total), substance conc., (fPt)S-Triglycerides, substance conc., S-HDL-cholesterol, substance conc., and (fPt)S-LDL-cholesterol, substance conc. (calculated). It is recommended that the biological variation be minimized by sampling in a sitting position after a 15 minutes' rest and by basing the clinical decision on a minimum of 2-3 determinations with an interval of about one month. The analytical variations should be reduced to below 3% (calculated as the variation coefficient), and it is recommended that laboratories participate in external quality control systems at least four times annually by reporting at least two human reference materials with different concentrations. As the use of reference intervals dependent on age and sex, based on random samplings of the background population, are less informative, it is recommended to refer to cutoff values for the clinical decision. The following cutoff values are recommended: S-Cholesterol (total), substance conc.: 6 mmol/l, (fPt)S-Triglycerides, substance conc.; 2.5 mmol/l, S-HDL-cholesterol, substance conc.: 0.9 mmol/l (fPt)-LDL-cholesterol, substance conc. (calculated): 4.5 mmol/l.(ABSTRACT TRUNCATED AT 250 WORDS)