From my expeience, the test is not so important. All the flu in this stage is classified as influenza A (most likely 80% swine flu).
The most important is that within 24 hrs and 48hrs, see whether your kids has other sympthom instead. For my boy, since he has asthma before, our private doctor took him as high risk class. Took his sample and sent to Govt' for analysis. If the fever can control below 38.0 C, and no other sympthom. The case is fine, easy to recover. If the fever insists not to lower by means of taking the medicine, the case should be keep in view. Check any other sympthom?