This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
Which of the following tests is gold standard to diagnose a case of PHN? 
Select and explain. 
A. HAMS test, B. Sucrose lysine test, C. Flow cytometry, D. Bone marrow
C: Flow cytometry
Answer: C: Flow cytometry 
Explanation: Ref. Robbins Pathology. 9th edition. Page. 642

Diagnostic methods


HAM test – no more used
Gel card test
Flow cytometry – IOC
Best – FLAER (Fluorescent Aerolysin test)