This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Raji cell assays are used to quantitate 
Select and explain. 
A. Complement level, B. Immune complexes, C. T cells, D. Interferon level
B: Immune complexes
Answer: B: Immune complexes 
Explanation: Ref Robbins 9/e p207 The Raji cell assay is an in vitro method for detecting complement fixing immune complexes in serum samples. The Raji cell is a lymphoblastoid cell with B-cell characteristics derived from a Burkitt's lymphoma cell line. It has low affinity Fc receptors for binding immunoglobulin and high affinity receptors for binding complement