**Question:** Menorrhagia ('heavy periods') is defined as a blood loss of greater than:

A.
B.
C.
D.

**Correct Answer:** C. 700 mL

**Core Concept:**
Menorrhagia refers to heavy or prolonged menstrual bleeding. It is characterized by excessive blood loss, which can lead to anemia and fatigue in affected individuals. The normal menstrual blood loss varies between 30-80 mL per cycle.

**Why the Correct Answer is Right:**
In most cases, menorrhagia is caused by hormonal imbalances, particularly related to the hypothalamic-pituitary-ovarian (HPO) axis. The pituitary gland secretes follicle-stimulating hormone (FSH) and luteinizing hormone (LH), which stimulate the ovaries to produce estrogen and progesterone. These hormones, in turn, regulate menstruation. The correct answer, 700 mL, is the threshold for blood loss considered excessive. A blood loss of over 700 mL is considered significant and may require medical intervention.

**Why Each Wrong Option is Incorrect:**
A. This answer is incorrect because the correct threshold for excessive blood loss is not specified.
B. This answer is incorrect because it is too high, considering that menstrual blood loss is typically around 30-80 mL per cycle.
D. This answer is incorrect because it is too low, reflecting an unrealistic figure for normal menstrual blood loss.

**Clinical Pearl:**
Awareness of menstrual blood loss and its implications is crucial for healthcare professionals, as excessive bleeding can lead to iron deficiency anemia, fatigue, and other complications. A thorough history and physical examination, along with a complete blood count (CBC), can help diagnose menorrhagia and guide appropriate management.