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Neonatal screening for hyperlipoproteinemia. Methods for direct estimation of cord serum VLDL + LDL
Insights
Early detection of newborn hyperlipoproteinemia can be improved with a simple, inexpensive turbidimetric method for estimating beta-lipoproteins. This method, along with proper serum separation within 12 hours, aids in neonatal screening.
Area of Science:
- Biochemistry
- Neonatal Medicine
- Clinical Chemistry
Background:
- Early detection of hyperlipoproteinemia in newborns is crucial.
- Current methods rely on estimating cord blood total lipids and lipoprotein-lipids.
Purpose of the Study:
- To modify and evaluate immunological and turbidimetric methods for direct estimation of cord serum beta-lipoproteins (VLDL + LDL).
- To compare conventional heparin precipitation methods for cord serum analysis.
- To assess the impact of cord clamping time and serum storage on lipid and lipoprotein concentrations.
Main Methods:
- Modified immunological and turbidimetric assays for VLDL + LDL cholesterol.
- Ultracentrifugation for isolating VLDL + LDL cholesterol.
- Heparin-CaCl2 and heparin-MnCl2 precipitation methods.
- Cord clamping and serum storage experiments.
Main Results:
- Both modified methods showed good correlation with ultracentrifuged VLDL + LDL cholesterol (r=0.848, r=0.831).
- Heparin precipitation methods also demonstrated high correlations (r=0.923, r=0.899).
- Early cord clamping (within 5 minutes) did not significantly alter lipid/lipoprotein concentrations.
- Serum separation within 12 hours is recommended to prevent unpredictable changes.
Conclusions:
- The turbidimetric method is recommended for neonatal screening due to its ease and low cost.
- Accurate analysis of cord serum lipids and lipoproteins requires timely separation.
- These findings support improved diagnostic strategies for neonatal hyperlipoproteinemia.
Abstract:
The early detection of hyperlipoproteinemia in newborn infants has so far been based upon estimation of cord blood total lipids (cholesterol and triglyceride) and lipoprotein-lipids (VLDL-, LDL- and HDL-cholesterol). To be able to make a direct estimation of cord serum beta-lipoproteins (VLDL + LDL) two quite different methods were modified, one immunological and the other turbidimetric. Good correlations were found to VLDL- + LDL-cholesterol isolated in the ultracentrifuge (r = 0.848 and 0.831, respectively). If neonatal screening for hyperlipoproteinemia is considered, we recommend the very easy and inexpensive turbidimetric method. Furthermore, using cord serum, two conventional precipitation methods with heparin-CaCl2 and heparin-MnCl2 were compared by ultracentrifugation and high correlations were found (r = 0.923 and 0.899, respectively). A clamping study showed that following early clamping of the cord, the concentration of cord serum lipids and lipoproteins did not change markedly within the first five minutes. Storing experiments showed that serum should be separated within the first 12 h to avoid unpredictable changes in the concentration of cord serum lipids and lipoproteins.