Each lab is different Hun.. You doctor is the one who writes the lab order up asking for whatever specifics he is asking for. (which I can't comment on what he had ordered) Generally it would be to determine what bacteria is in the specimen they received. Most common bacteria in patients with a healthy immune system are GABHS (Streptococcus pyogenes) and S aureus.
Your doctor should have listed if this was possibly due to a puncture wound, skin abrasion, bite wound etc.. from there they know how to determine and what to test for to find out the bacteria involved. Your doctor may note a visual finding on the submitted report as well. If a blood sample was taken as well, then all 3 evaluations would give the end results. So there are a lot of variables here..
Hope this help Hun.