HONG KONG, Sept 21 (Reuters) - A three-year-old Hong Kong girl was found to have a kidney stone after drinking a milk product tainted by melamine, making her the territory's first suspected victim of China's tainted milk scandal.

Hong Kong health authorities said in a statement issued late on Saturday that the girl did not have symptoms, but received a medical check-up because she had consumed two to three cups of a Yili brand milk beverage daily for the past 15 months.

Samples of the product, made by China's Inner Mongolia Yili Industrial Group Co, were found to have been adulterated with melamine, a chemical that can cause kidney stones and can lead to renal failure among children.

The Hong Kong girl was discharged from hospital on Saturday.

"Her condition is good. She did not receive any operation," said a spokeswoman for the Princess Margaret Hospital.

China last week ordered widespread checks on dairy products and a recall of tainted items as the scandal, which began with powdered baby formula and spread to milk, sparked an outcry from its trading partners.

At the latest count, 6,244 children have fallen ill in China, four have died and 158 are suffering acute kidney failure.

A government food quality watchdog in China has said nearly 10 percent of milk and drinking yoghurt samples from three major dairy companies contained potentially deadly melamine.

The nitrogen-rich compound can be added to watered-down milk to get past quality inspections, which check for nitrogen to measure protein levels. (Reporting by Jeffrey Hodgson; Editing by John Chalmers)

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