A study by researchers at the Icahn School of Medicine at Mount Sinai showed that results for cholesterol tests done by Theranos Inc. differed enough from the two largest laboratory companies in the U.S. that they could throw off doctors’ medical decisions.

The Mount Sinai study was published online Monday in the peer-reviewed Journal of Clinical Investigation. The authors recruited 60 healthy adults in the Phoenix area and sent them for 22 commonly prescribed blood tests over a five-day period in July 2015.

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