This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Medicine
The evaluation in a newly diagnosed case of acute lymphoid leukaemia (ALL) should routinely include all of the following except 
Select and explain. 
A. Plasma viscosity, B. Bone marrow biopsy, C. Cellsurface phenotyping, D. Complete metabolic panel
A: Plasma viscosity
Answer: A: Plasma viscosity 
Explanation: Viscosity testing is typically reserved for cases of multiple myeloma where paraproteins (paicularly IgM) can lead to vascular sludging and subsequent tissue ischemia. ref - Harrison's internal medicine 20e pg, 758, 758t, 759 .