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A recent Mayo Clinic study has found that many U.S. health care providers are habitually ordering a mostly unnecessary, and quite expensive, genetic test to identify a patient’s hereditary risk of venous thromboembolism.

Mayo Clinic has launched a first-in-the-U.S. clinical test that will help patients who recently have been diagnosed with an inflammatory demyelinating disease but may be unsure of the exact disorder.

In the war against microbes, human beings are vastly outnumbered—and losing the weapons race.

Greg Widseth was suddenly hit by a rare disease that prompted his immune system to attack his brain cells, resulting in as many as 60 seizures a day. Special blood and spinal fluid tests developed by Mayo Medical Laboratories confirmed that Widseth had antibodies known to target certain brain cells.