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Related Experiment Videos

Methods for determining "reference changes" from serial measurements: plasma lipid-bound sialic acid.

S Shahangian1, H A Fritsche, J I Hughes

  • 1Department of Laboratory Medicine, University of Texas M. D. Anderson Cancer Center, Houston 77030.

Clinical Chemistry
|June 1, 1989
PubMed
Summary
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Lipid-bound sialic acid (LSA) levels in plasma show significant variation. A reference change of +/- 51 mg/L is statistically significant for healthy individuals, improving detection of LSA changes post-surgery.

Area of Science:

  • Biochemistry
  • Clinical Chemistry
  • Medical Diagnostics

Background:

  • Lipid-bound sialic acid (LSA) is a biomarker of interest.
  • Understanding LSA's intra-individual variability is crucial for accurate clinical interpretation.
  • Previous reference change values may not fully capture LSA's dynamic nature.

Purpose of the Study:

  • To determine a statistically significant reference change for plasma LSA in healthy individuals.
  • To evaluate the sensitivity of different reference change values in detecting LSA alterations post-surgery.

Main Methods:

  • Longitudinal measurement of plasma LSA in 26 healthy subjects over one year.
  • Calculation of reference change using standard deviation and autoregressive time-series modeling.
  • Comparison of LSA changes in patients undergoing surgery for colorectal cancer.

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Main Results:

  • The standard deviation of consecutive LSA measurements was 19.6 mg/L.
  • A reference change of +/- 39 mg/L was derived from the distribution of differences.
  • An autoregressive model yielded a statistically significant reference change of +/- 51 mg/L for 88% of subjects.
  • The +/- 51 mg/L reference change detected post-surgical LSA decrease in more patients than the +/- 39 mg/L value.

Conclusions:

  • A reference change of +/- 51 mg/L is more appropriate for assessing statistically significant changes in plasma LSA.
  • The autoregressive model provides a more robust estimate of intra-individual variability for LSA.
  • The findings enhance the clinical utility of LSA measurements, particularly in monitoring disease states like post-surgical cancer patients.