Dr. Charles Randolph Hughes Jr., 64, a Washington area obstetrician and gynecologist for nearly 40 years who was active in church organizations, died Saturday at his Silver Spring home after a heart attack.

In addition to his Silver Spring practice, Dr. Hughes was a member of Holy Cross Hospital in Silver Spring, and had been on the staff of the Washington Adventist Hospital in Takoma Park for 25 years.

He was a member of the American Board of Obstetrics and Gynecology, and the Washington and Montgomery County gynecological societies. He belonged to the Montgomery County Medical Society and was an associate member of the Medical Society of the District of Columbia.

Dr. Hughes had been a teacher in the adult forum class and a member of the administrative board of Woodside United Methodist Church in Silver Spring.

He was a member of the board of trustees of Asbury Methodist Village in Gaithersburg, where he had served as chairman of the planning and development committee of the Village's health care center.

He had been chairman of the Pastoral Counseling Service of the Washington area.

Dr. Hughes was born in Berryville, Va., and came to Washington at an early age. He earned both bachelors and doctors degrees at George Washington University. He served an internship and residency in pathology at Sibley Memorial Hospital and a residency in obstetrics and gynecology at the Columbia Hospital for Women before beginning private practice.

He was an officer in the Army Medical Corps in Europe during World War II.

Survivors include his wife of 40 years, the former Margery Temple League, of the home; a son, Arthur R., of Silver Spring; a daughter, Margery Hughes King, of Gaithersburg; four sisters, Alice Berry and Helen Fall, both of Silver Spring, Hannah Lange of Greensboro, N.C., and Mary Henry of Pasadena, Calif., and one grandchild.

The family suggests that expressions of sympathy be in the form of contributions to the memorial fund at Woodside United Methodist Church or to the Asbury Methodist Village.