A Chinese factory that supplies much of the active ingredient for a brand of a blood thinner that has been linked to four deaths in the U.S. is not certified by China’s drug regulators to make pharmaceutical products, according to records and interviews.

Because the plant, Changzhou SPL, has no drug certification, China’s drug agency did not inspect it. The United States Food and Drug Administration said this week that it had not inspected the plant either — a violation of its own policy — before allowing the company to become a major supplier of the blood thinner, heparin, to Baxter International in the United States.

Baxter announced Monday that it was suspending sales of its multidose vials of heparin after 4 patients died and 350 suffered complications. Why the heparin caused these problems — and whether the active ingredient in the drug, derived from pig intestines, was responsible — has not been determined.

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