Los Angeles County coroner's spokesman Craig Harvey said police had put a security hold on Jackson's case, limiting the amount of information that can be released.
He said a three-hour autopsy had been held but the cause of death had been deferred.
"It means that the medical examiner ordered additional testing such as toxicology and other studies," Mr Harvey said.
The tests would take between four to six weeks, at which point he anticipated being able to close the case, he said.
Jackson had a history of health problems, and the singer's friends and associates said they had been concerned about his use of pain-killing drugs.
He collapsed at his Los Angeles home around midday on Thursday.
A recording of the telephone call made to emergency services has been released, in which the caller said Jackson was unconscious and had stopped breathing.
His personal doctor was trying to revive him, the caller said.
News:BBC
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