What does this blood test mean?

My friend recently got all his bloods done.
His ASO test was high – I think a normal range is 200 and his was 313.
Aso is for strep – however he doesn’t have an obvious infection – outside of having a rash which he’s had for years – which most doctors have said is nothing.

Is this dangerous his levels?
Everything else in his test was normal?
Does this mean he’s contagious?

Thanks
x