First, read it through to get a general idea of how to perform the test. Then, go back and review the instructions and diagrams until you fully understand each step. Be sure you understand what the test is intended to do and what its limitations may be. Remember, the tests are not 100 percent accurate. Follow instructions exactly, including the specimen collection process, if that is a part of the test.
Sequence is important.
Don't skip a step. When a step is timed, be precise. Use a stopwatch, or at least a watch with a second hand. Note what you should do if the results are positive, negative, or unclear. If something isn't clear, don't guess.