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Modification in Ramsay's method for correct measurement of total iron-binding capacity
H Baadenhuijsen1, L G Deimann, A P Jansen
1Department of Internal Medicine, St. Radboud University Hospital, Nijmegen, The Netherlands.
Summary
Accurate total iron-binding capacity (TIBC) measurement requires adjusting serum pH in control samples. This study establishes a linear equation to determine the precise acid amount needed for pH correction in TIBC assays.
Area of Science:
- Clinical Chemistry
- Analytical Chemistry
- Biochemistry
Background:
- Quality control assessment trials for total iron-binding capacity (TIBC) in The Netherlands lacked sufficient literature evidence.
- Previous methods for serum TIBC determination may not adequately address sample pH variations, particularly in control sera.
Purpose of the Study:
- To reconsider and improve the determination of total iron-binding capacity (TIBC) in human and control sera.
- To identify the necessary adjustments for accurate TIBC measurement, especially concerning sample pH.
Main Methods:
- Investigated the impact of serum pH on Fe(III)-saturating reagent efficacy for TIBC determination.
- Analyzed reconstituted quality control sera for subnormal CO2 content and resulting high pH.
- Conducted detailed studies on serum-pH-reagent combinations, varying acid concentrations.
Main Results:
- A correct serum TIBC determination necessitates a reagent capable of correcting abnormally high serum pH caused by low sample CO2 content.
- Reconstituted quality control sera frequently exhibit low CO2 levels, leading to pH instability.
- A linear equation was derived correlating the minimum acid amount required for pH correction with the initial serum pH.
Conclusions:
- Serum pH significantly influences TIBC assay accuracy, particularly in control materials.
- The established linear equation provides a quantitative method for adjusting serum pH in TIBC assays.
- This work enhances the reliability of TIBC quality control assessment trials.