Roche Accu-Chek Performa Manuel De L'utilisateur page 32

If the control result is not acceptable, review this list for a possible cause.
1. Were the test strips or control solutions expired?
2. Was the tip of the control solution bottle wiped before and after use?
3. Were the test strip container and control solution bottle caps always closed tightly?
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4. Was the test strip out of the container for a long time?
5. Were the test strips and control solutions stored properly?
6. Were the testing steps followed?
7. Was the correct control solution level selected when the test was performed?
8. Did the code number on the meter display match the code number on the test strip
container?