The Securities and Exchange Commission is looking into Apple Inc's disclosures about Chief Executive Officer Steve Job's health problems to make sure investors were not misled.
The review doesn't necessarily mean investigators have seen evidence of wrongdoing, the person who is familiar with the situation told Bloomberg.
Bloomberg reported last week that Jobs is considering a liver transplant due to complications after treatment for cancer, according to people who are monitoring his illness.
At the beginning of this month Job said that he had a relatively simple treatment for a nutritional ailment. However a little over a week later, he announced a five-month medical leave, saying his health issues were more complex.
Apple's first quarter earnings will be reported after the market close today.
Apple stock had dropped 8.4 percent since news of Job's medical leave on January 14. Shares of Apple were up 2.35 percent, or $1.84 to 80.04 at 11:02 a.m. in New York trading.