Symptoms. An assessment of symptoms alone, by the patient or clinician, is an important indicator of treatment success and can be completed easily via telephone. In one study of medication abortion with mifepristone and misoprostol, patients correctly predicted passage of a gestational sac 85% of the time based on symptoms alone.7 In another study, the combined clinical assessment from the patient and the clinician had a sensitivity of 96% and a specificity of 67% for predicting complete pregnancy expulsion.8 Finally, in an analysis of 931 patients after medication abortion, when both the patient and clinician believed that the gestational sac had passed, ultrasonography demonstrated complete expulsion 99% of the time.9
Urine pregnancy testing. Several studies have demonstrated that the addition of urine pregnancy testing to a clinical assessment of symptoms is a safe and effective follow-up strategy in medication abortion. Contemporary over-the-counter pregnancy tests are high-sensitivity tests that have an hCG detection threshold of 25 to 50 mIU/mL. As these tests are widely and commercially available in the United States, they can be a useful tool in follow-up strategies.
In a study by Chen and colleagues, patients seeking medication abortion were offered a choice of follow-up with ultrasonography at 1 week versus a combination of a 1-week phone call and a 4-week high-sensitivity urine pregnancy test. In this study, approximately 40% of patients opted for phone follow-up. The rates of incomplete abortion and loss to follow-up were similar between the 2 groups, highlighting the significant number of individuals interested in alternative models of follow-up and the efficacy of phone and urine testing specifically.10
In another study that evaluated the feasibility of a telephone and urine testing follow-up strategy, 97% of patients completed follow-up and all continuing pregnancies were diagnosed prior to the 4-week urine pregnancy test.8
In a hospital in Edinburgh, where a telephone-based symptom assessment in combination with a 2-week low-sensitivity pregnancy test (hCG detection threshold of 2,000 mIU/mL; not commercially available in the United States) is the standard of care for medication abortion follow-up, Michie and Cameron reported a sensitivity of 100% and a specificity of 88% to detect ongoing pregnancies.11
Taken together, these data demonstrate that a combination of symptom assessment via telephone and home urine pregnancy testing (in addition to standard patient instructions and return precautions) is an appropriate strategy for medication abortion follow-up, and they suggest that similar strategies can be employed in the medication management of EPL.
To scan or not to scan?
Many published studies of EPL have used ultrasonography to confirm complete expulsion of pregnancy tissue; however, others have relied on either clinical evaluation or urine pregnancy testing to determine treatment success, using ultrasonography only as clinically indicated.12-14 In their evaluation of medication management versus surgical management of miscarriage, Niinimäki and colleagues performed urine hCG testing at a 5- to 6-week follow-up visit to determine treatment success; ultrasonography was obtained only if the urine hCG test was positive. They demonstrated a treatment success rate of 90% with mifepristone and misoprostol treatment,12 congruent with previously published results.
While a follow-up ultrasound scan may be helpful to accurately assess treatment efficacy in research protocols, it should not be considered necessary in clinical practice. Posttreatment imaging in an asymptomatic patient may place additional burden on the patient and health care system and may result in unnecessary intervention. Although treatment success is reliably defined by the absence of a gestational sac,15,16 the finding of a thickened endometrium or presence of vascularity may result in the patient receiving an unnecessary aspiration or other intervention.
The evidence from the medication abortion literature suggests that a combination of a 1-week telephone call to assess patient symptoms in addition to a 4-week high-sensitivity pregnancy test is a reasonable alternative follow-up strategy. A similar strategy is already used in the United Kingdom, where current National Institute for Health and Care Excellence guidelines for follow-up after medication management of EPL recommend home pregnancy testing in 3 weeks unless the patient experiences worsening pain or bleeding symptoms.17
Time to rethink follow-up care
Follow-up care for EPL should be provided in a way that is sensitive to the needs and preferences of the patient and, if desired, minimizes additional health care visits, testing, or procedures. While some patients may prefer ultrasonography follow-up, it is important for the clinician to recognize that there are safe and effective alternatives. Patient preference guides the choice of EPL management; this logic extends to follow-up strategies. As we strive to provide evidence-based, patient-centered EPL care, there is no need for universal follow-up ultrasonography. ●