Which term describes cycles with intervals longer than 35 days?

• A. Amenorrhea
• B. Menorrhagia
• C. Oligomenorrhea
• D. Dysmenorrhea

Answer: (C)

Cycles with intervals longer than 35 days are described as oligomenorrhea. This term captures infrequent menstruation, meaning the normal 21–35 day pattern is extended so menses occur less often. Normal cycles typically fall within that 21–35 day window, so any consistent extension beyond 35 days points to oligomenorrhea. In contrast, amenorrhea means no menses occur at all, dysmenorrhea is associated with painful cramps, and menorrhagia refers to heavy or prolonged bleeding. Recognizing oligomenorrhea can help in evaluating hormonal balance and ovulation status, which is important for planning any ultrasound assessment or pregnancy-related care.