Not sure is he needs a test. He has a cold and I have one too, DH unaffected. Cold has lasted a week so far and DS has now developed a slightly high temperature which is bought down by calpol. 36.7 usually and after calpol but between 37.5 and 37.9 without. This as far as I can see, is just about not a fever. Off his food etc but no cough.
Really don't want to put him through a test if not necessary.