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UPDATE 1-FDA warns Meridian of violations for lead-testing devices

(Adds details, shares)

Oct 23 (Reuters) - The U.S. Food and Drug Administration said on Monday it issued a warning letter to Meridian Bioscience Inc's unit for several federal law violations after inspecting its facility that makes lead-testing devices.

The violations include selling significantly modified versions of two of its blood lead-testing systems without the FDA's approval and failing to submit reports on the medical device after customer complained about discrepancies in the test results.

The U.S. regulator in July issued Meridian's unit, Magellan Diagnostics, a Form 483 for its North Billerica, Massachusetts-based facility, nearly two months after it warned that the tests may underestimate lead levels in blood.

A Form 483 outlines violations in the company's facilities, which if not resolved lead to a "warning letter" and in worst case, a ban.

Magellan's devices are the only lead-testing products cleared by the FDA and account for about half of all lead tests in the United States.

Meridian and its unit did not respond to the requests for comment.

The company has to notify the FDA before Nov. 10 about specific steps taken to address these violations and to prevent them from recurring, the regulator said.

Meridian's shares fell 3.2 percent to $15.30 in afternoon trading. (Reporting by Ankur Banerjee and Divya Grover in Bengaluru; Editing by Arun Koyyur)