The Justice Department indicated yesterday that it will take no immediate action on the House Assassinations Committee's recommendations for further inquiry into the murder of President Kennedy.

The House committee concluded last week after a $5.8 million investigation that "Kennedy was probably assassinated as the result of a conspiracy." The finding rested heavily on an acoustical study of the sounds in Dallas' Dealey Plaza, accidentally picked up by a police transmitter, when Kenndy was killed on Nov. 22, 1963.

The experts who conducted the study said the Dallas police tape recording of the noises showed "beyond a reasonable doubt" that a shot had been fired from the so-called "grassy knoll" in front of the president, in addition to those that came from the Texas School Book Depository.

Issuing its findings and recommendations in advance of a projected 39-volume final report expected to be released in March, the committee on Saturday called on the Justice Department to:

Commission an expect study of a long-ignored film taken in Dealey Plaza before and during the assassination "to determine its significance, if any." Private researchers who helped unearth the film in November have maintained that blow-ups of the frames show two figures at the sixth-floor windows of the Texas School Book Depository seven minutes before the murder. The House committee asked its photographic experts to study the film, but their findings apparently were inconclusive.

Conduct a study of the use of acoustics in criminal cases, with the Kennedy assassination as the prime example. The committee suggested the work be done jointly by the National Institute of Law Enforcement and the National Science Foundation.

The House committee recommended that the department then decide, on the basis of these studies and the committee's forthcoming final report, "whether further official investigation is warranted" in either the Kennedy assassination or that of the Rev. Martin Luther King Jr. in Memphis on April 4, 1968.

However, Justice Department spokesman Terry Adamson said neither the department nor the FBI will take any steps until the committee's voluminous final report, including supporting data, is issued. Adamson said the department would compare the committee's final report with previous investigations and would "take such action at that time as we may determine warranted."

In Gainesville, Fla., a former cousel for the House Committee, Kenneth Brooten, suggested that some medical evidence might support the conspiracy theory. He said Kennedy's autopsy showed a hematoma, or blood clot, in the upper back beneath the shoulder blade. Brooten was quoted by United Press International as saying the cause of the clot has never been revealed.

The chief of the House committee's medical panel, New York City's chief medical examiner, Michael Baden, said the entire medical panel was satisfied that the hemorrhaging was caused by a shot that entered Kennedy's back and came out through his neck.