A 6yo pt comes with easy bruising in different places when she falls

A 6yo pt comes with easy bruising in different places when she falls. CBC: WBC=25, Hgb=10.9,
Plt=45. Her paul bunnel test +ve. What is the most likely dx?
a. Glandular fever
b. ITP c. Trauma
d. NAI
e. Septicemia
Q. 1. What is the key?
Q. 2. What are the lab. Values that suggests the diagnosis here?
Ans. 1. The key is A. Glandular fever.
Ans. 2. Suggestive lab. Values: WBC=25 (leucocytosis), Hgb=10.9 (usually patient is not anaemic), Plt=45 (thrombocytopenia-leading to easy bruising), Positive paul bunnel test.