Thanks for posting your query.
In children Alkaline phosphatase
is normally increased related to adults.It may range up to 350 U/L and less than it is considered normal. Fever and lymphocytosis
(more lymphocytes) suggest viral infection.Infection mononucleosis
caused by Ebstein Barr virus may be suspected.In such conditions paracetamol/ibuprofen
is prescribed for fever, as viral infections resolve on its own. You are advised to get some labs like LFT (may be deranged in mononucleosis) and serological tests.
Do not worry, you should visit your doctor to rule out other diseases.
Hope it helps.