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Elizabeth Holmes (L) and Alan Murray speak at the Fortune Global Forum at the Fairmont Hotel on November 2, 2015 in San Francisco, California.
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The laboratory practices of Theranos, the embattled blood-testing startup led by entrepreneur Elizabeth Holmes, “pose immediate jeopardy to patient safety,” according to a letter from the U.S. Department of Health and Human Services on Monday.

The Theranos lab was surveyed by the Centers for Medicare and Medicaid Services for compliance with the Clinical Laboratory Improvement Amendments of 1988 on Nov. 20, 2015.

The lab was found deficient for hematology (the study of blood), analytic systems, and other practices.

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