Should I continue hormone replacement therapy (HRT) while an abnormal Pap smear is being evaluated, and under what circumstances should HRT be discontinued?

HRT After Abnormal Pap: Continue During Evaluation

You can safely continue hormone replacement therapy (HRT) while an abnormal Pap smear is being evaluated, as HRT does not interfere with the diagnostic workup and is not a contraindication to colposcopy or cervical procedures. The abnormal Pap result should be managed according to standard cervical cancer screening guidelines regardless of HRT status.

Key Management Principles

HRT continuation during evaluation:

• HRT does not need to be stopped for colposcopy, HPV testing, or cervical biopsies
• The hormonal effects on cervical cytology are well-characterized and do not compromise diagnostic accuracy
• Standard ASCCP guidelines apply equally to women on HRT 1

Important Caveat: HRT Can Cause False-Positive Results

Be aware that HRT itself may cause benign cytologic changes that mimic abnormalities:

• Postmenopausal women on HRT have significantly increased rates of ASCUS diagnoses (8.3% vs 2.3% in non-users) 2
• These changes are often HPV-negative and represent benign glycogenization rather than true dysplasia 2
• In one study, only 2 of 25 women with ASCUS on HRT had subsequent biopsy-proven SIL 2

If you suspect HRT is causing a false-positive ASCUS result:

• Consider stopping HRT for 3-6 months and repeating the Pap test before proceeding to colposcopy 3
• This approach is reasonable for low-grade abnormalities (ASCUS, LSIL) in women with negative prior screening
• Do NOT delay colposcopy for high-grade results (ASC-H, HSIL) or HPV 16/18 positive results

Follow Standard ASCCP Guidelines Based on Result

For ASCUS (age ≥21):

• Three options: prompt colposcopy, repeat Pap at 6 and 12 months, or high-risk HPV testing 4
• If HPV positive → colposcopy
• If HPV negative → repeat Pap at 12 months
• For low-risk patients with negative HPV in past 5 years → can defer colposcopy and repeat testing in 1 year 1

For LSIL:

• Colposcopy recommended for most women
• Exception: If negative HPV test or cotest within past 5 years → can repeat testing in 1 year instead 1

For ASC-H or HSIL:

• Immediate colposcopy required 1
• If HSIL with HPV 16 positive → expedited treatment (loop electrosurgical excision) may be appropriate 1

When to Discontinue HRT

Discontinue HRT only if:

• High-grade dysplasia (CIN 2/3) or cancer is diagnosed and treatment is planned
• The patient prefers to stop during evaluation for peace of mind
• You strongly suspect HRT is causing false-positive ASCUS and want to clarify before colposcopy

Do NOT routinely discontinue HRT for:

• Pending colposcopy appointments
• Low-grade abnormalities being monitored
• HPV testing or repeat cytology

Practical Algorithm

1. Receive abnormal Pap result → Continue HRT
2. Determine severity:
   • ASCUS/LSIL with negative HPV in past 5 years → Consider stopping HRT for 3-6 months, then repeat Pap
   • ASCUS/LSIL without recent negative HPV → Proceed with standard workup (HPV testing or colposcopy) while continuing HRT
   • ASC-H/HSIL → Immediate colposcopy, continue HRT
3. If colposcopy shows CIN 2/3 → Discuss stopping HRT with treatment
4. If colposcopy negative → Continue HRT and surveillance per guidelines

Additional Considerations

• HRT increases breast density on mammography, which is more relevant than cervical screening concerns 3
• Women on HRT who have benign endometrial cells on Pap actually have less abnormal endometrial histology than non-users (2.6% vs 7.4%) 5
• No evidence suggests HRT increases HPV detection or cervical cancer risk in the short term 6

The bottom line: Keep the patient on HRT during the diagnostic workup unless there's a specific reason to stop, and manage the cervical abnormality according to standard guidelines.