Obtain a complete blood count and serum ferritin levels. In women presenting with HMB, iron depletion and iron deficiency anemia are common. The finding of leukocytosis raises the possibility of PID or postpartum endometritis. In women with presumptive AUB-O, checking the levels of thyroid-stimulating hormone, free T4, and prolactin should be performed.
Screen for a hemostasis disorder. Women with excessive menstrual bleeding should be clinically screened for an underlying disorder of hemostasis (TABLE 1).3 When a hemostasis disorder is suspected, initial laboratory evaluation includes a partial thromboplastin time, prothrombin time, activated partial thromboplastin time, and fibrinogen. Women who have a positive clinical screen for a possible bleeding disorder or abnormal initial laboratory test results for disorders of hemostasis should undergo further laboratory evaluation, including von Willebrand factor antigen, ristocetin cofactor assay, and factor VIII. Consultation with a hematologist should be considered in these cases.
Perform endometrial biopsy when indicated
After excluding pregnancy, endometrial biopsy (through pipelle biospy or brush sampling; FIGURE 4) should be performed in women with AUB who are at increased risk for endometrial neoplasia. The prevalence of endometrial neoplasia is substantially higher among women ≥45 years of age4 and among patients with AUB who are also obese (BMI, ≥30 kg/m2).5 In addition, AUB patients with unopposed estrogen exposure (presumed anovulation/PCOS), as well as those with persistent AUB or failed medical management, should undergo endometrial biopsy.6
Utilize transvaginal ultrasonography
Transvaginal ultrasonography is often useful in the evaluation of patients with AUB, as it may identify uterine fibroids or adenomyosis, suggest intracavitary pathology (such as an endometrial polyp or submucosal fibroid), or raise the possibility of PCOS. In virginal patients or those in whom vaginal ultrasound is not appropriate, abdominal pelvic ultrasonography represents appropriate imaging. If unenhanced ultrasound suggests endometrial polyps or fibroids within the endometrial cavity, an office-based saline infusion sonogram (sonohysterogram) (FIGURE 5) or hysteroscopy should be performed. Targeted endometrial sampling and biopsy of intracavitary pathology can be performed at the time of hysteroscopy.
Treatment
When HMB impairs quality of life, is bothersome to the patient, or results in anemia, treatment is appropriate. Although bleeding episodes in women with AUB-O may be infrequent (as with Case 2), treatment prevents heavy or prolonged bleeding episodes as well as endometrial neoplasia that may otherwise occur in anovulatory women.
Many women with AUB can be managed medically. However, treatment choices will vary with respect to the patient’s desire for future fertility, medical comorbidities, personal preferences, and financial barriers. While many women may prefer outpatient medical management (TABLE 2),7-14 others might desire surgical therapy, including endometrial ablation or hysterectomy.
Oral contraceptives
Combination estrogen-progestin oral contraceptives represent appropriate initial therapy for many women in the reproductive-age group with AUB, whether women have HMB or AUB-O. However, contraceptive doses of estrogen are not appropriate for some women with risk factors for cardiovascular disease, including those who smoke cigarettes and are age ≥35 years or those who have hypertension (TABLE 3).15,16
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