These are the two questions I hear most often from patients considering Fecal Microbiota Transplantation: "Does it actually work?" and "What is this going to cost me?" They're exactly the right questions to ask, and I'd rather give you a direct, data-driven answer than a vague reassurance. So let's go through both in detail.
FMT Success Rate for Recurrent C. difficile
For recurrent Clostridioides difficile infection — the indication with the strongest evidence base — fecal microbiota transplantation (FMT) has consistently demonstrated cure rates of 85–95% across dozens of studies, systematic reviews, and meta-analyses. This is the most important number to understand: roughly 9 out of 10 patients with recurrent C. diff who receive FMT are cured.
To put that in context, antibiotics — the standard of care — have the following success rates for recurrent C. diff: vancomycin achieves sustained cure in approximately 31–44% of cases of recurrent infection. Fidaxomicin (Dificid) performs somewhat better at around 40–55%. After three or more recurrences, cure rates with antibiotics alone drop further, while the probability of yet another recurrence climbs to 60% or higher. FMT's 85–95% cure rate in this population represents a dramatic difference.
A landmark 2013 randomized controlled trial by van Nood et al., published in the New England Journal of Medicine, demonstrated this so clearly that the trial was stopped early for ethical reasons — it would have been wrong to continue giving patients only antibiotics when FMT was performing so much better. That trial reported an 81% cure rate with a single FMT infusion versus 31% with vancomycin alone.
Subsequent meta-analyses have refined these numbers. A 2019 systematic review in Clinical Gastroenterology and Hepatology analyzing 37 studies and over 1,500 patients found a pooled cure rate of 92% for recurrent C. diff treated with FMT. The rate was highest with colonoscopy delivery (95%) and somewhat lower but still highly effective with enema (84%) and capsule administration (88%).
What Affects FMT Success Rate?
While the overall numbers are excellent, several factors influence individual outcomes:
Donor quality: This is arguably the most important variable. The concept of the "super donor" — a donor whose microbiome composition produces consistently high cure rates across multiple recipients — has been documented across multiple independent studies. Not all donors are equally effective. A clinic that carefully characterizes and selects its donor pool will produce better outcomes than one that uses unselected donors.
Delivery method: Colonoscopy delivers material throughout the entire colon in a single procedure and has the highest single-session cure rates. Capsules and enema are highly effective and more convenient, but some patients may require a second course.
Timing relative to antibiotics: FMT is most effective when administered shortly after a course of antibiotics that has reduced (but not eliminated) the C. diff burden. The pre-FMT antibiotic course "clears space" for donor bacteria to colonize. The specific antibiotic, dose, and timing before FMT affects outcomes.
Immunosuppression: Patients who are significantly immunocompromised — for example, those on high-dose steroids, chemotherapy, or post-organ transplant — may have lower response rates, though FMT can still be effective in this population with appropriate precautions.
Number of prior recurrences: Counterintuitively, patients with more prior C. diff recurrences do not necessarily have lower FMT success rates. FMT appears to work regardless of how many antibiotic courses have already been tried.
Fecal Transplant Cost: What to Expect
Fecal transplant cost varies considerably depending on the clinic, delivery method, protocol length, and whether any preparatory or follow-up care is included. I'll give you a general framework for FMT cost ranges, though the only way to get specific pricing for your situation is through a consultation.
Capsule-based fecal transplant cost: Capsule FMT is typically the most affordable option, generally ranging from $3,000 to $8,000 for a complete course, because there's no colonoscopy, anesthesia, or procedural facility fee. The cost reflects the donor screening, material preparation, and physician oversight.
Enema-based fecal transplant cost: Enema FMT has a similar cost profile to capsules — typically $3,000 to $8,000 when performed in an outpatient clinic setting without general anesthesia.
Colonoscopy-based fecal transplant cost: Colonoscopy FMT carries additional costs associated with the procedural suite, anesthesia, and the colonoscopy itself — typically $8,000 to $20,000+, varying significantly by region and facility.
Insurance coverage for fecal transplant: Insurance coverage for FMT is inconsistent. Some plans cover colonoscopy-based fecal transplant for recurrent C. diff under the colonoscopy benefit. Others do not cover fecal transplant at all, or cover only specific FDA-approved products (Rebyota or Vowst) when prescribed through a gastroenterologist. It is worth contacting your insurer directly and asking about coverage for "fecal microbiota transplant" and the relevant CPT codes before your treatment.
The cost of not treating: When patients ask about fecal transplant cost, I always encourage them to think about the full cost comparison. Recurrent C. diff typically involves multiple antibiotic courses (fidaxomicin costs $3,000–$5,000 per course), emergency department visits, hospitalizations (average C. diff hospitalization costs $15,000–$30,000), lost work, and profound quality-of-life impact. Viewed in this context, an effective fecal transplant is often cost-effective even when paid entirely out of pocket.
At Our Clinic
We've been performing FMT since 2014 and have treated over 1,000 patients. Our success rate for recurrent C. difficile mirrors the published literature at above 90%. We use carefully selected super donors screened far beyond FDA minimums. We offer capsule, oral liquid, enema, and colonoscopy delivery — and we match the method to the patient.
We discuss all costs transparently during the initial consultation. We're happy to help you think through insurance, understand your options, and develop a protocol that makes clinical and financial sense for your situation.
If you have questions about whether FMT might be right for you — or you simply want to understand the evidence and options before making a decision — schedule a consultation and we can talk through everything in detail. Patients in California can also see our FMT California overview for region-specific access details (including our virtual + capsule pathway for the Bay Area and Southern California).
