Of the 86 commercials during yesterday's New York broadcast (March 8), 77 were unpaid public service announcements from the Ad Council, The Hollywood Reporter says.
Of the remaining nine ads, seven were from firms who are said to be in the process of removing their commercials from the show, Media Matters reports.
Thursday's show on WABC 770 AM is reported to have included five minutes of dead air spread over four instances, though it was not confirmed if this was due to technical problems or missing advert spots.
Limbaugh attracted criticism after calling Georgetown University law student Fluke a "prostitute" and a "slut" over her testimony to the House of Representatives regarding insurance coverage for contraception.
Fluke rejected Limbaugh's apology over the incident, noting that he merely said that "his choice of words was not the best" and that it only came only as his sponsors left the show.
Peter Gabriel has called for his music to be pulled from any of Limbaugh's shows.
Actress Patricia Heaton apologised this week after her own criticism of Fluke on Twitter.
> Bill Maher defends Rush Limbaugh apology to Georgetown student
Watch a CNN report about Rush Limbaugh's apology below: