What is the appropriate workup for menorrhagia?

Menorrhagia Workup

Begin with a thorough history focusing on bleeding patterns (clots ≥1 inch, "flooding" requiring pad changes more than hourly, duration >7 days), personal or family bleeding history, and perform transvaginal ultrasound as the first-line imaging study, combined with laboratory assessment for anemia (CBC, ferritin), pregnancy test, and consideration of endometrial sampling in women ≥35 years or those with risk factors for endometrial cancer. 1, 2

Clinical History - Key Elements

Focus your history on specific bleeding characteristics that predict underlying pathology:

• Bleeding pattern assessment: Document clots ≥1 inch diameter, "flooding" (pad/tampon changes more frequently than hourly), and duration of menses 2
• Personal bleeding history: Prior bleeding with surgeries, dental procedures, or childbirth
• Family history: Bleeding disorders in first-degree relatives
• Medication review: Anticoagulants, antipsychotics, antiepileptics 3
• Age considerations: Women ≥35 years have higher risk for structural pathology 3

Critical pitfall: Heavy menstrual bleeding with flooding, prolonged menses, or positive personal/family bleeding history strongly suggests an underlying bleeding disorder and warrants hematology referral 2.

Physical Examination

• Hemodynamic assessment: Orthostatic vital signs if acute heavy bleeding 4
• Pelvic examination: Speculum exam to exclude cervical/vaginal pathology, bimanual exam to assess uterine size 1, 3
• Pap smear: According to standard screening guidelines 5

Laboratory Workup

First-Line Tests (All Patients)

• Complete blood count: Assess for anemia and platelet count 2, 5
• Serum ferritin: More sensitive than hemoglobin alone for iron deficiency 2, 6
• Pregnancy test (hCG): Must be performed to exclude pregnancy 5, 7

Selective Laboratory Tests

• Coagulation studies: Order if flooding/prolonged menses, personal/family bleeding history, or anemia disproportionate to reported bleeding 2, 4
  • Von Willebrand disease is the most common inherited bleeding disorder in women with menorrhagia 3
• Thyroid function (TSH): If clinical suspicion for thyroid dysfunction 3, 7
• Prolactin: Only if galactorrhea or amenorrhea present 3

Important note: Routine hormonal measurements are generally not contributive except when polycystic ovary syndrome is suspected 7.

Imaging Studies

Transvaginal Ultrasound (First-Line)

Transvaginal ultrasound is the recommended first-line imaging modality for all women with proven menorrhagia 1, 5, 8. This evaluates for:

• Endometrial polyps
• Leiomyomas (fibroids)
• Adenomyosis
• Endometrial thickness

Second-Line Imaging (When TVUS Inadequate)

• Saline infusion sonohysterography or hysteroscopy: When TVUS cannot adequately visualize the endometrium or when medical treatment fails 3, 5, 8
• MRI with diffusion-weighted imaging: When ultrasound cannot completely evaluate the endometrium due to patient body habitus, uterine position, or presence of multiple fibroids/adenomyosis 1, 7

Key limitation: TVUS may not adequately visualize the uterus in all women due to body habitus, uterine position, or presence of pathology like adenomyosis 1.

Endometrial Sampling

Indications for Endometrial Biopsy

Perform endometrial biopsy (Pipelle) in the following scenarios 3, 5, 7:

• Age ≥35 years with recurrent anovulation
• Age <35 years with risk factors for endometrial cancer:
  • Obesity
  • Polycystic ovary syndrome
  • Diabetes mellitus
  • Prolonged unopposed estrogen exposure
• Excessive bleeding unresponsive to medical therapy (any age)
• If endometrium cannot be completely evaluated by ultrasound, consider sampling based on individual risk factors for endometrial cancer 1

Age-Specific Considerations

Premenopausal Women

Common structural causes include polyps, adenomyosis, and leiomyomas 1. Distinguish between:

• Anovulatory bleeding: Irregular, unpredictable bleeding patterns
• Ovulatory bleeding (true menorrhagia): Regular cycles with excessive flow 3

Adolescents

• Screen for bleeding disorders: Up to 90% of adolescents with underlying bleeding disorders present with heavy menstrual bleeding 2, 4
• Assess hemodynamic stability: Orthostatic vital signs essential 4
• Lower threshold for hematology referral 4

Postmenopausal Women

Endometrial cancer is the primary concern and drives the evaluation in this population 1. Any postmenopausal bleeding requires prompt evaluation with imaging and likely endometrial sampling.

Algorithmic Approach Summary

1. History → Bleeding patterns, personal/family bleeding history, medications, age
2. Physical exam → Hemodynamic status, pelvic examination
3. Laboratory → CBC, ferritin, pregnancy test (± coagulation studies, TSH based on history)
4. Imaging → Transvaginal ultrasound first-line
5. Endometrial sampling → If age ≥35, risk factors present, or inadequate response to treatment
6. Advanced imaging/procedures → Sonohysterography, hysteroscopy, or MRI if TVUS inadequate or treatment failure