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Related Experiment Videos

Erythrocyte folate analysis: a cause for concern?

A J Wright1, P M Finglas, S Southon

  • 1Institute of Food Research, Colney, Norwich, UK. tony.wright@bbsrc.ac.uk

Clinical Chemistry
|September 11, 1998
PubMed
Summary
This summary is machine-generated.

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Red cell folate (RCF) assays may underestimate folate levels due to hemoglobin

Area of Science:

  • Biochemistry
  • Hematology
  • Nutritional Science

Background:

  • Adequate periconceptional folate intake prevents neural tube defects.
  • Folate status is inversely associated with cardiovascular disease and cancer risk.
  • Red cell folate (RCF) is a key indicator for folate deficiency risk.

Purpose of the Study:

  • To critically assess the assumptions underlying current red cell folate (RCF) assays.
  • To investigate the impact of hemoglobin oxygenation state on RCF measurement accuracy.

Main Methods:

  • Review of published literature on RCF assay methodologies.
  • Theoretical analysis of folate binding to hemoglobin based on oxygenation state.
  • Evaluation of potential folate "trapping" during blood sample processing.

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Main Results:

  • Many assumptions underpinning RCF assays are identified as false.
  • Deoxy-hemoglobin binds RCF electrostatically, increasing assayable folate.
  • Oxy-hemoglobin reduces RCF binding, leading to underestimation in oxygenated venous blood.

Conclusions:

  • Current RCF assay methods may significantly underestimate true red cell folate levels.
  • The oxygenation state of hemoglobin in venous blood samples is a critical confounding factor.
  • Re-evaluation of previous RCF values and development of accurate assessment strategies are necessary.