HONG KONG - A 3-YEAR-OLD Hong Kong girl has been diagnosed with a kidney stone after drinking milk laced with the industrial chemical melamine, the local government said.

It's the first case outside of mainland China in a food safety scandal that has killed four children and sickened more than 6,200 others.

The girl was diagnosed with a kidney stone but was in good condition and has been discharged from the hospital, the government said in a statement late on Saturday.

It wasn't immediately clear if the kidney stone had passed.

Preliminary blood tests on the girl were normal, the government statement said.

The girl's parents had taken her for a health checkup because she had been drinking two or three cups of low-fat milk made by Chinese dairy Yili every day for the past 15 months.

Yili Industrial Group is one of the 22 companies whose milk and dairy products were recalled after batches were found to contain the industrial chemical melamine.

Used in making plastics, melamine is high in nitrogen, which registers as protein in tests of milk. Though health experts believe ingesting minute amounts poses no danger, melamine can cause kidney stones, which can lead to kidney failure. Infants are particularly vulnerable. -- AP