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[Lysine in human biologic fluids and tissues: reference values, physiologic variations and interferences].

M A Gelot1

  • 1Laboratoire Central de Chimie, CHRU de Nancy.

Annales De Biologie Clinique
|January 1, 1991
PubMed
Summary

This study compiles lysine levels in various biological fluids, noting lower plasma concentrations in newborns and higher cerebrospinal fluid (CSF) in males. Factors like sample handling and medications can affect these critical amino acid measurements.

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Area of Science:

  • Biochemistry
  • Clinical Chemistry
  • Human Physiology

Context:

  • Lysine is an essential amino acid crucial for various physiological processes.
  • Understanding lysine concentrations in biological fluids is vital for diagnosing and managing certain health conditions.
  • This research consolidates existing data on lysine levels across multiple human biofluids.

Purpose:

  • To present a comprehensive overview of published lysine values in human biological fluids.
  • To highlight variations in lysine concentrations based on age, sex, and physiological state (e.g., pregnancy).
  • To identify pre-analytical and analytical factors that can influence lysine measurements.

Summary:

  • Published data on lysine concentrations in plasma, urine, cerebrospinal fluid (CSF), amniotic fluid, aqueous humor, and sweat are compiled.

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  • Plasma lysine levels are lower in neonates compared to adults.
  • Urinary lysine excretion is elevated during the first pregnancy, and amniotic fluid lysine concentration declines progressively. CSF lysine levels are higher in males.
  • Pre-analytical issues, such as delayed sample preparation, and certain drugs can alter measured lysine concentrations.

    • Impact:

    • Provides a valuable reference for researchers and clinicians studying amino acid metabolism and related disorders.
    • Highlights the importance of considering physiological factors and analytical methods when interpreting lysine levels.
    • Contributes to a better understanding of lysine homeostasis in health and disease across the human lifespan.