Initial tests indicate Manhasset dermatologist Kiersten Cerveny had cocaine in her system when she died after a night of partying in Manhattan last weekend, a law enforcement official said.

The test, conducted at the time of her autopsy Monday, showed Cerveny, 38 and the married mother of three, had used cocaine, said the official, who didn't want to be named. But further toxicology tests were needed to determine the quantity of cocaine in her body and whether there were any other drugs present, the official said.

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Cerveny died Sunday morning after she was found unresponsive and unconscious in the lobby of 223 W. 16th St. in Chelsea. The NYPD said Monday the autopsy revealed there was no indication of trauma or sexual assault.

Tuesday, police were still sticking to their assessment that Cerveny, a well-liked dermatologist who lived on Castle Ridge Road, died because of cocaine use and not through criminality of another person. But that could change if the toxicological tests show the cocaine she used contained other dangerous controlled substances.

Investigators said Cerveny had been partying in lower Manhattan on Saturday night when she met up with a friend, film producer Marc Henry Johnson, and the two went to the 16th Street address, the home of a reputed cocaine dealer. Police said Cerveny had been drinking and using cocaine earlier.

A police spokesman said Tuesday Johnson, who did not return a telephone call seeking comment, was not suspected of any wrongdoing.

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Former city medical examiner Dr. Michael Baden said cocaine can cause heart arrhythmia, which can be accentuated by alcohol. "It's a tragedy doctors get so involved [in drugs], but they do," Baden said.