Whitney Houston's emergency 911 call will not be released as it involves "confidential medical information".

The iconic singer was found unresponsive in a fourth-floor hotel room in Beverly Hills on Saturday afternoon, with no immediate apparent cause of death.

Prescription drugs including Lorazepam, Valium and Xanax used as sleeping aids, relaxants and to ease anxiety were reportedly found in Whitney's hotel room. She is alleged to have been on a 48-hour drinking binge before her death.

Despite requests for the contents of the late star's call for help to be released, they have been denied.

According to ET Online the 911 audio "involve[s] confidential medical information and are [therefore] exempt from disclosure."

First responders initiated CPR after finding Whitney's unresponsive body in the hotel room over the weekend, however their attempts were unsuccessful.

Coroner Ed Winter says there were no signs of trauma or foul play.

Officials are not ruling out any causes until they receive the results of toxicology tests, which can take anything from four to eight weeks to be completed.

Whitney is survived by her 18-year-old daughter Bobbi Kristina and mother Cissy Houston.

The legendary songstress' body has been released back to her family. Whitney was flown back to her native New Jersey in a private jet and taken to Newark's Whigham Funeral home, it has been reported.

Her funeral has been scheduled for this weekend and it has been suggested her family are considering holding the service at Newark's Prudential Center. The venue can seat up to 18,000 people and usually hosts sporting events.

Whitney's long-time friend Marvin Winans is expected to deliver the eulogy at the service, according to E! Online.

The pastor who is based in Michigan officiated Whitney's marriage to ex-husband Bobby Brown in 1992.