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Direct serum total iron-binding capacity assay suitable for automated analyzers
Gordon Siek1, Joseph Lawlor, Donna Pelczar
1Reference Diagnostics, Inc., 19 Crosby Dr., Suite 30, Bedford, MA 01730, USA. gsiek@ref-dx.com
Clinical Chemistry
|December 26, 2001
Summary
A new direct automated assay (DTIBC) simplifies serum total iron-binding capacity (TIBC) measurement. This method offers a reliable and efficient alternative for clinical laboratories, enhancing iron metabolism studies.
Area of Science:
- Clinical Chemistry
- Biochemical Assays
- Iron Metabolism
Background:
- Current methods for serum total iron-binding capacity (TIBC) are cumbersome, requiring sample manipulation or multiple assays.
- A novel direct automated assay (DTIBC) has been developed to streamline TIBC measurement.
Purpose of the Study:
- To develop and validate a direct automated assay (DTIBC) for measuring serum total iron-binding capacity (TIBC).
- To compare the performance of the DTIBC assay with existing methods for TIBC determination.
Main Methods:
- The DTIBC assay involves adding a saturating amount of iron-bound chelating dye to serum at low pH, followed by a neutral buffer.
- The decrease in absorbance, proportional to TIBC, is measured. Assay validation included comparisons with alumina column TIBC (AC), magnetic particle TIBC (MTIBC), and unsaturated iron-binding capacity (UIBC) methods on different analyzers.
Main Results:
- The DTIBC assay demonstrated high correlation with MTIBC (r=0.987), AC (r=0.982), and UIBC (r=0.982) methods on COBAS analyzers.
- Correlation with MTIBC on an Olympus AU400 analyzer was also high (r=0.983).
- The assay showed linearity from 12.5 to 125 micromol/L, with imprecision
Conclusions:
- The direct automated assay (DTIBC) is suitable for routine clinical laboratory use.
- This assay has the potential to improve the quality of iron metabolism studies.
- The DTIBC assay offers a more efficient and reliable method for TIBC determination.