A solid-phase antiglobulin test

Area of Science:

• Immunology
• Transfusion Medicine
• Clinical Pathology

Background:

• The indirect anti-human globulin test (IAHG) is a standard method for detecting antibodies in blood compatibility testing.
• Manual IAHG testing can be time-consuming and subject to inter-observer variability.
• There is a need for automated, machine-readable methods to improve efficiency and consistency in antibody detection.

Purpose of the Study:

• To describe and evaluate a machine-readable solid-phase test (SPT) as an adaptation of the manual IAHG test.
• To compare the sensitivity and accuracy of the SPT with the manual IAHG test for detecting IgG antibodies.
• To assess the correlation between SPT results and manual pretransfusion compatibility tests.

Main Methods:

• Development of a solid-phase test (SPT) as a machine-readable adaptation of the indirect anti-human globulin test (IAHG).
• Comparison of SPT sensitivity with manual IAHG testing for IgG antibody detection.
• Evaluation of SPT performance using blood samples from donors and hospitalized patients, with comparison to manual compatibility tests.
• Analysis of the relationship between SPT optical density values and manual IAHG scores.

Main Results:

• The SPT demonstrated comparable sensitivity to manual IAHG testing for IgG antibody detection.
• A linear and overlapping relationship was observed between manual IAHG scores and SPT optical density values.
• Compatibility testing on over 1700 samples showed good correlation between SPT and manual IAHG results, with minor discrepancies (1.38% SPT+/IAHG- and 5.37% SPT-/IAHG+).
• Optimal immunoglobulin concentration for the solid phase was approximately 275 mg/L, with accuracy slightly decreasing at higher red cell concentrations.

Conclusions:

• The solid-phase test (SPT) is a viable, machine-readable alternative to the manual indirect anti-human globulin test (IAHG).
• The SPT offers comparable sensitivity and good correlation with established manual compatibility testing methods.
• This automated approach has the potential to enhance efficiency and consistency in pretransfusion compatibility testing.