Latest ACOG Management of Abnormal Uterine Bleeding
Start with the PALM-COEIN classification system to categorize the cause, then proceed with medical management using combined hormonal contraception or progestin-only contraception as first-line therapy for ovulatory dysfunction, reserving surgical options for medical treatment failure or structural lesions 1.
Diagnostic Framework
Use the PALM-COEIN classification to systematically identify the etiology 1:
Structural causes (PALM):
- Polyp
- Adenomyosis
- Leiomyoma (submucosal or other)
- Malignancy and hyperplasia
Non-structural causes (COEIN):
- Coagulopathy
- Ovulatory dysfunction
- Endometrial
- Iatrogenic
- Not yet classified
Essential Diagnostic Workup
Mandatory initial tests:
- Pregnancy test (beta-hCG)
- Thyroid-stimulating hormone
- Prolactin levels 1
Imaging approach:
- Transvaginal ultrasound is first-line for all reproductive-aged women 2
- Saline infusion sonohysterography has 96-100% sensitivity and 94-100% negative predictive value for detecting intracavitary lesions 1
- Avoid transvaginal ultrasound in virgins; use transabdominal imaging instead 1
Endometrial sampling indications:
- Only perform endometrial biopsy when additional risk factors for endometrial cancer exist 2
- Endometrial biopsy is preferred over dilation and curettage (less invasive, safer, lower cost) 1
- Critical caveat: Sensitivity varies with lesion type (focal vs. diffuse), size, and location 1
Medical Management Algorithm
For ovulatory dysfunction (first-line):
- Combined hormonal contraception OR
- Progestin-only contraception 1
For bleeding disorders:
- Levonorgestrel-releasing intrauterine system (LNG-IUS) is most effective, commonly achieving amenorrhea 3
- Tranexamic acid as second-line or combination therapy 3
- Desmopressin (DDAVP) for patients with coagulopathies 3
Treatment goals to establish:
- Stop acute bleeding
- Prevent heavy bleeding recurrence
- Provide contraception if desired
- Prevent long-term complications 1
When Medical Management Fails
Proceed to further investigation:
- Hysteroscopy for direct visualization of endometrial cavity and endocervix
- Identifies focal lesions potentially missed by endometrial sampling 1
Surgical options:
- Endometrial ablation (not first-line)
- Hysterectomy
- Reserved for: medical treatment failure, contraindications to medical therapy, intolerance, or concomitant significant intracavitary lesions 1
Critical Pitfalls to Avoid
Endometrial ablation complications:
- Postablation Asherman syndrome
- Synechiae and cervical stenosis
- Endometrial contracture and strictures
- Delayed endometrial cancer diagnosis (most concerning) 1
Biopsy limitations:
- Can miss focal lesions, small polyps, or intracavitary leiomyomas
- Less reliable with uterine malformations
- May require hysteroscopy for definitive diagnosis 1
Imaging errors:
- Transabdominal ultrasound has limited endometrial assessment value
- Always use transvaginal approach when anatomically appropriate 1
Acute Bleeding Management
For hemodynamically unstable patients:
- Immediate hemodynamic stabilization takes priority
- Antifibrinolytics for rapid bleeding control
- Hormonal agents for ongoing management
- Surgical intervention only when medical therapy fails 4