| Verified against primary record | |
| Surveillance window | 30 days for most procedures and 30 or 90 days for others, by procedure category[1] |
|---|---|
| Implant follow-up | One year for procedures involving a prosthetic implant[2] |
| How infections are found | Capture by readmission surveillance ranged from 43.6 to 100 per cent across specialties[2] |
| Why a low rate can mislead | Low outlier status may be indicative of low case ascertainment[2] |
| Records read | Two surveillance definitions, a systematic review, a commissioned review, a press release and a grading table, 9 October 2026 |
| Independently reported | |
| When infections appear | In one review of 55 articles, 60.1 per cent appeared after discharge, with a per-study range of 13.5 to 94.8[3] |
| Bands apply only to the rows beneath them. No complication rate for medical travel is published here, because the reviewers who looked state that it is unknown. | |
Complication rates in medical tourism cannot currently be calculated, and the reason is structural. The surveillance systems that count complications are bounded by time and by institution, and a patient who flies home sits outside both boundaries within days of the operation.
A rate needs a window, and the window varies
Surgical site infection, the commonest measurable surgical complication, is defined against a fixed observation period. American national surveillance defines a superficial incisional infection as one whose date of event occurs within 30 days following the operative procedure, counting the procedure date as day one, and a deep incisional infection as one occurring within 30 or 90 days depending on the procedure category. Superficial infections are monitored for 30 days for all procedure categories.[1] Colon surgery, caesarean section, hysterectomy and appendectomy sit in the 30-day group; cardiac surgery, craniotomy and hip and knee prosthesis sit in the 90-day group.
United Kingdom surveillance runs 30 days after surgery for non-implant procedures and one year for procedures involving a prosthetic implant, and does not require microbiology, since positive microbiology is not essential to meet the case definition provided there are other clinical indicators.[2]
A complication rate quoted without its procedure category and its observation window is therefore not interpretable, because the same surgery monitored for 30 days and for 90 days will produce different numbers from identical care.
Most complications appear after the patient has left
This is the fact that makes medical travel different. A systematic review of 55 articles from 15 countries found that of 141,347 infections, 84,984, or 60.1 per cent, appeared after discharge, with individual studies ranging from 13.5 to 94.8 per cent.[3] The honest headline is the range rather than the point estimate, and the citation for this review is incomplete: the page consulted names neither the journal nor the authors.
How those post-discharge infections get counted is the mechanism by which a medical traveller disappears. United Kingdom surveillance reports that the proportion of infections captured by readmission surveillance ranged from 43.6 per cent for vascular surgery to 100 per cent for breast surgery.[2] Readmission capture requires readmission to a hospital inside the surveillance system that recorded the operation. A patient who had surgery in another country and presents to a hospital at home satisfies neither condition.
The alternative route is deliberately incomplete. Post-discharge questionnaires exist to capture infections managed outside hospital settings, but their provision and completion is not mandatory, albeit strongly recommended for operations with short post-operative stay, and infections they detect are not included in the data used for the published report.[2]
Why a low published rate proves little
Two sentences in the same surveillance report should accompany any provider’s complication figure. Annual trust outlier assessments are unadjusted for differences in the patient population and important risk factors. And low outlier status may be indicative of low case ascertainment but could also reflect exceptional patient care.[2]
A national surveillance body states plainly that a low rate may mean nobody looked. That is the correct reading of an unaudited provider figure in any country.
An arithmetic correction
One figure now circulating widely needs correcting at source. A publisher’s press release for a 2026 review states that the case series and case reports included 655 patients treated by the health service between 2011 and 2024, and in the same document that at least 196 patients, 53 per cent, experienced moderate to severe complications.[4]
Those two numbers do not belong together. 196 of 655 is 30 per cent. The underlying review reports the severity figures separately by procedure group, giving at least 117 of the bariatric patients and at least 77 of the cosmetic patients as having complications graded three or above, which with two ophthalmic cases totals 196 against a graded subset of roughly 370 rather than against the full 655.[5] The 53 per cent is a proportion of that subset.
Three further conditions belong with it. Every figure is prefixed in the source by the words at least. Five of the included bariatric case series covered only emergency, urgent or acute admissions. And the cost evidence in the same review is rated at very low certainty, with the verified range being 1,058 to 19,549 pounds per patient in 2024 prices rather than the rounded upper bound that the press release headlines.[5]
So any sentence of the form that 53 per cent of medical travellers suffer severe complications is wrong twice over: wrong on the denominator, and wrong in treating a selected series of patients who presented to hospital as a population of people who travelled.
What the reviewers conclude
The review’s own position is the one this entry adopts: the overall complication rate for outward medical tourism for elective surgery in the United Kingdom and in Wales is unknown, as is the number of residents choosing to travel abroad for elective surgery.[5] Without a denominator there is no rate, and the numerator is itself under-counted.
Where severity is reported, a standard grading exists and is worth insisting on, its highest grade being defined simply as death of a patient.[6] Studies that report graded severity can at least be compared with each other.
See also
- Treatment success rates in medical tourism, the same denominator problem in reverse
- Case studies in medical tourism research, why the numerator is a selected series
- Long-term outcomes of medical tourism, what happens beyond the surveillance window
- Clinical outcomes in medical tourism, the absent denominator population
References
- United States Centers for Disease Control and Prevention, National Healthcare Safety Network. 2026 NHSN surgical site infection checklist. January 2026. Verified against primary record: case definitions and surveillance windows read in full. Retrieved 9 October 2026.
- UK Health Security Agency. Surveillance of surgical site infections in NHS hospitals in England, April 2024 to March 2025. Verified against primary record: case definitions, follow-up periods, capture proportions, questionnaire status and outlier caveats read. Retrieved 9 October 2026.
- Surgical Infection Society North America. Proportion of surgical site infections occurring after hospital discharge, a systematic review. Page dated 10 October 2016. Independently reported: society summary page opened and read; the page names neither the journal nor the authors of the review it summarises. Retrieved 9 October 2026.
- BMJ Group. Postoperative complications of medical tourism may cost NHS up to 20,000 pounds per patient. Press release, 13 January 2026. Provider-supplied: publisher’s press release for its own journal article, cited here for the figures it prints. Retrieved 9 October 2026.
- England C, Bromham N, Needham-Taylor A, Hounsome J, Gillen E, Ingram BJ, Davies J, Edwards A, Lewis R. Complications and costs to the UK National Health Service due to outward medical tourism for elective surgery, a rapid review. BMJ Open, 2026;16(1):e109050, published 13 January 2026; preprint at medRxiv 10.1101/2025.04.02.25325086. Independently reported: publicly commissioned review, preprint full text read. Retrieved 9 October 2026.
- Clavien-Dindo classification of surgical complications, as tabulated in BMC Urology, 2022. Independently reported: published table opened and read; only the highest grade was retrieved verbatim and only that grade is quoted here. Retrieved 9 October 2026.
Sourcing note: the two surveillance documents, the review summary, the commissioned review, the press release and the grading table were opened and read on 9 October 2026. The 53 per cent figure is reproduced only together with the arithmetic that shows it does not match the 655-patient total printed alongside it, because it is circulating in that incorrect pairing. The post-discharge infection review is cited from a society summary page that does not name its journal or authors, and that limitation is stated rather than filled. Only the highest severity grade was retrieved verbatim from the grading table, so the other grades are not quoted.