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which lab test will determine if the immune deficiency is due to an absence of B cells

1.Radioimmunoassay
2.Flow cytometry
3.Elisa
3.immunofixation
4.Coombs test

1..................?

.Flow cytometry

2.

CD19,20,21 are markers on B cells,flow is good for B and T cells markers

2.flow cytometry.

Correct ans is 2