Hello, Yes, there are many reasons for a false positive test. Most important one are due to previous contamination or drug to procedural error. The percentage of dependent upon the lab workers and reagents used,none of the infusion provided here. So there are false positive chances. No, you don t need to worry because you are under the doctors surveillance, in case there is raised fever or generalized body pain you can get the prescription written by the pediatrician and avoid any dangerous situations till the sensitivity test will be available again. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Muzaffer Hussain Parray , Dentist