Harvard Health Letter

Your blood work, on the edge of normal

What to do when routine test results are at the high or low end of the acceptable range.

blood-work-blood-test
Catching early changes in blood work may help prevent chronic disease, such as diabetes.
Image: Ca-ssis/Thinkstock

As a smart medical consumer, you know it's important to look over the results of your routine blood work, even when the numbers are all within the normal range. But what if you notice that some results are at the high or low end of that range? Should you be concerned about this?

"It's tricky, because in some tests, a borderline result makes no difference. In others, it might indicate an important change in health that we need to follow or act on," says geriatrician Dr. Suzanne Salamon, assistant professor at Harvard Medical School.

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