A source said things would have turned out differently for Joan Rivers if it weren't for an unplanned throat biopsy.

Rivers was only supposed to get a routine surgical procedure when she underwent the biopsy. Medical experts say that this routine should not be done outside of a hospital, notes the New York Daily News.

Furthermore, Yorkville Endoscopy mostly deals with digestive problems. A doctor that was with Rivers and not with the clinic asked to use their tools, which the clinic allowed. The biopsy made her vocal chords seize, which cut off her air supply.

"A biopsy like that should only be done in a hospital setting," the source said. "It she had been in a hospital when it happened, she might have been okay."

The clinic would not give any details due to legal reasons, but a spokesperson has said that it is well suited to handle emergencies. It has "the same level of live-saving and resuscitation devices (such as state-of-the-art cardiac defibrillators, airway management equipment, etc.) found in any hospital emergency room or hospital-based operating room."

Rivers was originally there to see "why her voice had gotten raspy," according to her friends.

Another source said that Rivers' daughter, Melissa Rivers, will probably never sell her $35 million apartment.

Melissa has been at her mother's apartment for weeks with her son.

"They grieved together and wanted to be surrounded by Joan and be in her living space," the source said. "It's sort of like their sanctuary. So much of Joan is in the apartment and it keeps her memory alive."

The source added that planning her mother's funeral was very difficult, and that the apartment has proved to be a place she finds comfort.

In Joan Rivers' last interview, she explained that her daughter didn't like talking about her death. But the comedienne explained that in her eighth decade, it was certainly going to happen soon.