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Summary
Certain saline solutions compromise blood group serology tests, particularly the antiglobulin test. Using phosphate-buffered saline (pH 7.0-7.2) is recommended for improved sensitivity and standardization in serological testing.
Area of Science:
- Clinical laboratory science
- Immunology
- Blood banking
Background:
- Saline solutions are critical reagents in blood group serology.
- Failures in proficiency testing highlighted issues with certain saline solutions.
- The antiglobulin test's sensitivity can be affected by reagent quality.
Purpose of the Study:
- To investigate why certain saline solutions are inappropriate for blood group serology.
- To identify factors in saline solutions that compromise the antiglobulin test.
- To recommend optimal saline solutions for serological testing.
Main Methods:
- Investigated a failure of proficiency in blood group serology.
- Evaluated the impact of different saline solutions (pH, autoclaving, storage) on antiglobulin test sensitivity.
- Assessed changes in titration scores and antibody detection.
Main Results:
- Low pH and autoclaved saline stored in plastic compromised antiglobulin test sensitivity.
- Sensitivity loss ranged from reduced titration scores to complete antibody detection failure.
- Clinically significant blood group antibodies were affected.
Conclusions:
- Saline solution source, pH, and storage containers are critical for serological tests.
- Phosphate-buffered saline (pH 7.0-7.2) offers improved standardization and sensitivity.
- Unbuffered saline solutions with pH < 6.0 should be avoided for serological testing.