What should you do about borderline test results?

Treat them as information rather than either a diagnosis or an all-clear. Practical steps: confirm with a repeat test, since single readings vary and laboratory error exists; check whether the test conditions were right, particularly fasting status and timing; and ask specifically what the result means in the context of your other risk factors, because the same number carries different weight for different people. Borderline results are usually the most actionable ones you will ever get, since they represent the window where lifestyle change works best and medication is not yet needed.