Ailing singer Natalie Cole's son has undergone tests to establish if he can donate a much-needed kidney to his mom. Cole, 58, has been battling ill health since she was diagnosed with hepatitis C in 2008.

She suffered kidney problems while she was being treated for the liver disease, and is currently undergoing dialysis three times a week.

The only cure is a kidney transplant - and the star reveals her 31-year-old son Robert is being checked out as a possible donor.

Cole says, "My son may be a possible match. It's very sweet and kind of strange to have people offer something like that."

Last month it was reported that Cole's sister Timolin was also being touted as a possible donor match.

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(This news article provided by World Entertainment News Network)