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An in-house ELISA method for measuring surfactant protein A
K B Cheong1, S K Cheong, N Y Boo
1Department of Pathology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur.
The Malaysian Journal of Pathology
|December 1, 1995
Summary
A new enzyme-linked immunosorbent assay (ELISA) accurately measures surfactant protein A (SP-A) in neonatal tracheal aspirates. This reliable method aids in diagnosing respiratory distress syndrome in newborns.
Area of Science:
- Biochemistry
- Immunology
- Neonatal Medicine
Background:
- Surfactant protein A (SP-A) is crucial for lung function and is a potential biomarker.
- Accurate measurement of SP-A is needed for diagnosing neonatal respiratory conditions.
Purpose of the Study:
- To develop and validate an in-house enzyme-linked immunosorbent assay (ELISA) for quantifying SP-A.
- To assess the assay's performance using neonatal tracheal aspirate samples.
Main Methods:
- Development of an in-house ELISA using polyclonal anti-SP-A antibodies and a commercial conjugate.
- Generation of a standard curve for SP-A concentrations from 4 µg/L to 4000 µg/L.
- Evaluation of assay performance through recovery, reproducibility, and interference studies.
Main Results:
- The developed ELISA demonstrated a linear and reproducible standard curve.
- Recovery rates ranged from 94%-114%, indicating high accuracy.
- Intra- and inter-assay coefficients of variation were low (2.7% and 5.6%, respectively).
- Tracheal aspirate samples did not interfere with the assay.
Conclusions:
- An in-house ELISA for SP-A measurement in neonatal tracheal aspirates was successfully developed and validated.
- The assay is reliable, reproducible, and suitable for clinical use in diagnosing respiratory distress syndrome.