Management of Irregular Menses with Normal Laboratory Results

Initial Diagnostic Confirmation

The American College of Obstetricians and Gynecologists recommends pregnancy testing is mandatory in all reproductive-age women with irregular bleeding, regardless of reported contraceptive use or cycle pattern 1, 2
Structural pathology, including polyps, adenomyosis, leiomyomas, and endometrial hyperplasia, should be ruled out, particularly in women over 35 years where endometrial evaluation becomes critical 3, 4
Confirmation of "normal labs" should include TSH, prolactin, FSH, LH, and pregnancy test at minimum 1, 4
Consideration of PCOS evaluation is necessary if not already done, as 4-6% of the general population has PCOS, which commonly presents with irregular menses and normal routine labs 1

The American College of Obstetricians and Gynecologists recommends NSAIDs, such as mefenamic acid 500 mg three times daily for 5 days, as the initial pharmacologic treatment for irregular bleeding patterns when heavy bleeding is not present 1, 5
Alternative treatment with celecoxib 200 mg daily for 5 days can be considered 1
Low-dose combined oral contraceptives for 10-20 days can be used as short-term treatment for heavy or prolonged bleeding, but increase venous thromboembolism risk three to fourfold 1, 5
Levonorgestrel-releasing IUD (20 μg/day) is the most effective long-term option, reducing menstrual blood loss by 71-95%, and represents the gold standard for long-term management when estrogen is contraindicated 1, 4

Providing detailed expectations about bleeding patterns with any hormonal treatment significantly reduces method discontinuation 1
Endometrial biopsy is indicated before treatment initiation to exclude hyperplasia or malignancy in women over 35 years with irregular menses, as this represents a perimenopausal bleeding pattern 4
Relative Energy Deficiency in Sport (RED-S) should be considered as an underlying cause of irregular menses in athletes, and assessment of low energy availability, eating disorders, and bone health concerns is necessary 6

Reassessment within 2-3 cycles is necessary to evaluate treatment response 1
Consideration of alternative hormonal methods or adjustment of current regimen is necessary if irregular bleeding persists despite treatment and remains unacceptable to the patient 1, 5
Referral to gynecology is necessary if bleeding continues despite two treatment attempts 1
Reassessment for missed structural or endocrine pathology is necessary if bleeding persists despite treatment 3, 4