Which of the following tests is used to detect the presence of residual white blood cells in leukoreduced red blood cell components?

A Flow cytometry
B Nucleic acid testing
C Immunofluorescence assay
D Residual leukocyte count by fluorescence microscopy ✓

Explanation

Residual leukocyte count by fluorescence microscopy is a test used to detect and quantify residual white blood cells in leukoreduced red blood cell components.

Source

AABB Technical Manual
Hematology Hematology: Blood Grouping and Crossmatching Hematology: Blood Grouping and Crossmatching Hard MEDICAL Confidence: medium