5. Amenorrhea - primary
Amenorrhea is the absence of menstruation. Primary amenorrhea is not considered to have occurred until a girl is beyond age 16, if she has undergone other normal changes that occur during puberty.
www.uhseast.com

6. Amenorrhea - Primary Symptoms & Treatment
Primary amenorrhea; No periods - primary; Absent periods - primary; Absent menses - primary; Absence of periods - primary
www.christusschumpert.org

7. Amenorrhea, Primary: eMedicine Obstetrics and Gynecology
Primary amenorrhea is the failure of menses to occur by age 16 years, in the presence of normal growth and secondary sexual characteristics. If by age 13, menses has not occurred and the onset of puberty, such as breast development, is absent, a w...
emedicine.medscape.com

8. Welcome to the Walter Reed Army Medical Center - Amenorrhea, Primary
Complete absence of menstruation in a young woman who is at least 16 years old, or at age 14 with a lack of normal growth or absence of normal sexual development. It is a rare disorder as over 95% of girls have their first menstrual period by age 15
www.wramc.army.mil

9. Primary amenorrhea - Shands Healthcare
Primary amenorrhea is the absence of the menstrual period by the age of 16. Treatment of amenorrhea may range from hormonal supplementation for developmental abnormalities of the reproductive system to surgery for tumors of the pituitary.
shands.org