| Verified against primary record | |
| The strongest population survey | 93,492 respondents, 517 medical tourists, prevalence 1.32 per cent, 2016[1] |
|---|---|
| Confidence interval | 1.00 to 1.64 per cent at 95 per cent[1] |
| Records read | A population survey study, a passenger survey method and three reviews, 2 October 2026 |
| Independently reported | |
| Study design in this field | All quantitative data in a 2026 systematic review was cross-sectional and collected through surveys[2] |
| A cautionary figure | 11,000 to 14,000 patients a year, extrapolated from one month at 46 clinics in six countries[3] |
| Bands apply only to the rows beneath them. The extrapolated figure is reproduced only together with its derivation. | |
Medical tourism surveys are the main alternative to administrative data in this field, and in some respects the better one, because a survey can ask the question that administrative records never capture: did this person travel, and why. What a survey can support depends almost entirely on where it was administered and to whom.
Three sampling frames, three different things measured
A population survey asks a sample of residents of a country whether they travelled. This is the only design that can produce a prevalence, because it has a denominator of people who might have travelled and did not. A study using a United States behavioural survey for calendar year 2016 found an overall medical tourism prevalence of 1.32 per cent, with a 95 per cent confidence interval of 1.00 to 1.64, among 93,492 respondents across eleven states and territories, of whom 517 were identified as medical tourists.[1] It covers eleven states rather than a nation, and one year, and it is the strongest instrument of its kind located for this site.
A passenger survey asks travellers at the point of travel. The United States estimates health-related travel spending from the Survey of International Air Travelers, using data on the incidence and expenditures of travellers travelling for health purposes.[4] That gives a money figure rather than a patient count, and it depends on self-reported purpose.
A clinic survey asks patients at the destination. This is the commonest design in the published literature and the weakest, because the sample consists only of people who arrived, were well enough to answer and chose to. A 2026 systematic review of decision-making in bariatric and cosmetic medical travel records that all quantitative data in the studies it included was cross-sectional and collected through surveys, that studies conducted within the destination country create sampling bias relative to recruiting at home, that research focuses on single centres, and that prospective studies with generalisable samples are needed.[2]
What extrapolation does to a snapshot
The most instructive example in this field is a figure that is quoted constantly and almost never explained. A 2010 study of cross-border reproductive care collected questionnaires at 46 assisted reproduction centres in six countries, from patients attending during one calendar month between October 2008 and March 2009, yielding 1,230 completed forms. From that it derived a minimum estimated number of 11,000 to 14,000 patients a year.[3]
The study describes the figure as an estimate and states its basis. What happens to it afterwards is the problem. It circulates stripped of its date, its six-country scope, its one-month fieldwork window and the word estimated, and is reproduced as though it were an annual count of European cross-border fertility patients.
The underlying proportions from that study are sound within their scope and are useful: among those patients, 6.1 per cent overall were single women and 9.7 per cent described themselves as homosexual or bisexual, with legal reasons given by 54.8 per cent overall.[3] Proportions measured in a sample travel better than totals extrapolated from one.
Reading a survey figure
Five questions settle how much weight a survey figure in this field can carry. Where was the sample drawn from, at the origin or at the destination. How large was it, and what was the response rate. What is the denominator, and is there one at all. Was the instrument validated, or built by the authors for the study. And is the headline number a measurement within the sample, or an extrapolation beyond it.
Two published studies illustrate the lower end. One surveyed 1,474 international patients at a single accredited hospital between May and December 2023, of whom 94 per cent were from non-western countries, and measured experience after arrival rather than the decision to travel. Another measured satisfaction using four borrowed items among 205 Chinese exchange students in Malaysia. Both are legitimate pieces of work within their stated scope, and neither supports a statement about medical travel generally.
The broader assessment is that reliable calculations of the actual volume of patient flow remain rare, and that most papers cite similar figures while the sources are often inaccessible or trace back to media reports or to other academic papers quoting inaccessible sources.[5]
See also
- Administrative data in medical tourism research, the alternative source type
- Patient satisfaction in medical tourism, where clinic surveys are mostly used
- Medical tourism statistics, the overview of what is measured
- Fertility tourism, the sector the extrapolated figure describes
References
- Stoney RJ, Kozarsky P, Walker AT, Gaines J. Population-based surveillance of medical tourism among U.S. residents from 11 states and territories. Infection Control and Hospital Epidemiology, vol. 43, no. 7, July 2022; survey reference year 2016. Independently reported: peer-reviewed analysis of an official survey instrument. Retrieved 2 October 2026.
- Nichol B, Ray D, Tanner L, et al. Decision-making about bariatric and cosmetic medical tourism from countries with universal healthcare: a rapid systematic review. Globalization and Health, 2026;22:45. Independently reported: peer-reviewed systematic review. Retrieved 2 October 2026.
- Shenfield F, et al., ESHRE Taskforce on Cross Border Reproductive Care. Cross border reproductive care in six European countries. Human Reproduction, vol. 25, issue 6, June 2010; fieldwork October 2008 to March 2009. Independently reported: peer-reviewed study. Retrieved 30 September 2026.
- United States Bureau of Economic Analysis. U.S. International Services. Survey of Current Business, October 2020. Verified against primary record: statistical agency publication opened and read. Retrieved 2 October 2026.
- King H, in Lunt N, Smith RD, Mannion R, et al. Systematic review: what do we know about medical tourism? In Implications for the NHS of inward and outward medical tourism, NIHR Journals Library, January 2014. Independently reported: publicly commissioned peer-reviewed research. Retrieved 2 October 2026.
Sourcing note: the population survey study, the passenger survey method, the cross-border reproductive care study and the two reviews were opened and read for this site, the 2010 study on 30 September 2026 and the rest on 2 October 2026. The figure of 11,000 to 14,000 patients a year is reproduced only alongside its full derivation, because it is an extrapolation from a one-month questionnaire window at 46 clinics in six countries and is almost always quoted without that context. The two illustrative clinic studies are described by their scope rather than cited for any general claim.