Medical diagnostic imaging start-ups promising to detect early-stage cancer and cardiovascular conditions in healthy people, without a doctor’s order, continue to pop up across the country.

But before you become too excited about these chin-to-thigh MRIs, you may want to know that the U.S. Food and Drug Administration and the Choosing Wisely in Preventive Medicine Program are not yet ready to endorse full-body MRI scans as an effective screening procedure. Medical societies like the American College of Preventive Medicine (ACPM) are not yet recommending the scans either.

“It’s too early to tell whether full-body MRI scans are safe for everyone and whether these scans can consistently produce accurate results,” says Dr. Prentiss Taylor, an internal medicine physician with Advocate Health Care.

These MRI scans use much of the same technology available under a doctor’s care. However, to make the service cost-effective, the scans are typically generated and evaluated by artificial intelligence (AI).

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The end of this article included free assessments for lung cancer, breast cancer, and heart disease.