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Newer blood tests can help doctors diagnose Alzheimer's disease without a brain scan or spinal tap. But some tests are more accurate than others. Tek Image/Science Photo Library/Getty Images hide caption

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Tek Image/Science Photo Library/Getty Images

Blood tests can help diagnose Alzheimer's — if they're accurate enough. Not all are

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The most common test for coronavirus infections checks for the virus' genetic material. A blood test that, instead, measures antibodies against the virus could give doctors and researchers more information. Jane Barlow/WPA Pool/Getty Images hide caption

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Jane Barlow/WPA Pool/Getty Images

How A Coronavirus Blood Test Could Solve Some Medical Mysteries

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A decade ago, it seemed inevitable that every newborn would get a complete gene scan. But there are technical challenges and practical concerns. Brooke Pennington/Getty Images hide caption

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Brooke Pennington/Getty Images

The Promises And Pitfalls Of Gene Sequencing For Newborns

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Finding some change in the blood of an Alzheimer's patient that accurately reflects the damaging changes in the brain has been tough. utah778//iStockphoto/Getty Images hide caption

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utah778//iStockphoto/Getty Images