American Society for Clinical Pathology (ASCP) Histotechnician Certification Practice Exam

The accuracy of immunohistochemical staining is fundamentally enhanced by using proper controls and optimizing antibody concentrations. This process is crucial because immunohistochemistry relies on specific antibody binding to target antigens within tissue samples.

Utilizing proper controls involves employing known positive and negative controls alongside the test samples. This allows the technician to confirm that the staining method is working correctly and that any observed staining is due to the intended target antigens rather than nonspecific binding or other artifacts.

Optimizing antibody concentrations is equally important. Too much antibody can lead to high background staining, while too little may result in weak or undetectable signals. Finding the appropriate concentration ensures clarity and specificity in the staining process, which is vital for accurate interpretation of results.

The other options do not contribute positively to the accuracy of staining. Random selection of samples may introduce bias in the results, varying staining times can lead to inconsistent outcomes, and using outdated antibodies can compromise the reliability and specificity of the staining procedure. Therefore, the best practice for ensuring accuracy in immunohistochemical staining revolves around proper controls and optimization of antibody concentrations.