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Related Experiment Videos

Variability of leptin values measured from different sample matrices.

M Gröschl1, R Wagner, H G Dörr

  • 1Klinik mit Poliklinik für Kinder und Jugendliche, Friedrich-Alexander-Universität Erlangen-Nürnberg, Loschgestrasse 15, D-91054 Erlangen, Germany. michael_groeschl@hotmail.com

Hormone Research
|February 22, 2001
PubMed
Summary

For accurate leptin measurement, K2-EDTA or lithium-heparin plasma is recommended over serum. Citrate plasma shows lower leptin values due to dilution effects.

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Area of Science:

  • Biochemistry
  • Clinical Chemistry
  • Endocrinology

Background:

  • Leptin measurements are crucial for understanding metabolic and endocrine functions.
  • Standard laboratory practice typically involves analyzing leptin in serum or EDTA-plasma.

Purpose of the Study:

  • To compare the precision and accuracy of leptin quantification across different blood sample matrices.
  • To identify the optimal sample type for reliable leptin level determination.

Main Methods:

  • Blood samples from healthy volunteers were processed into serum and plasma using K2-EDTA, citrate, fluoride, or lithium-heparin.
  • Leptin concentrations were measured using a specific radioimmunoassay.
  • Statistical analysis was performed to compare results between matrices.

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Main Results:

  • Serum samples exhibited the highest coefficient of variation (CV: 11.9%), while K2-EDTA plasma showed very low CV (5.3%).
  • Leptin levels were significantly lower in serum compared to K2-EDTA plasma (p < 0.05).
  • Fluoride and lithium-heparin plasma yielded the lowest CVs (5.2% and similar to K2-EDTA, respectively), whereas citrate plasma showed lower values (~25% less) and a higher CV (5.8%).

Conclusions:

  • K2-EDTA and lithium-heparin plasma provide the most reliable and precise matrices for leptin measurement.
  • Citrate plasma may lead to underestimated leptin concentrations due to dilution by anticoagulants.
  • The study recommends using K2-EDTA or lithium-heparin plasma for accurate leptin quantification.