Do they take a blood or urine sample when testing for pneumonia?

In some cases. Blood urine cultures, white cell counts are foten helpful but not often specific.
Maybe. The complete blood cell count can sometimes help a doc narrow down the potential cause of a pneumonia and a blood culture can find the germ if it is in the blood. Urine is not much of a help but often taken to verify normal kidney function. Many docs know its pneumonia from the exam and or chest x-ray and may treat on that basis.