| Verified against primary record | |
| The formula | Hospital days divided by the number of discharges, including deaths, during the year[1] |
|---|---|
| A non-resident series exists | Eurostat disseminates average length of stay for non-resident patients alongside the resident series[1] |
| Range across the European Union | 5.2 days in Bulgaria to 9.4 days in Hungary, in most member states[2] |
| Records read | A statistical metadata record, a statistics article, a national statistics portal and two travel releases, 9 October 2026 |
| Independently reported | |
| What the non-resident split is not | A residency split, not a purpose split; it includes emergencies, expatriates and entitlement patients |
| Bands apply only to the rows beneath them. No figures from the non-resident series are published here, because its populated country coverage was not verified. | |
Average length of stay is a precisely defined hospital statistic that is routinely confused with a quite different quantity, the number of nights a traveller spends in the destination country. The two have different numerators, different denominators and different uses, and medical travel marketing tends to blur them.
The formula, and what is in it
European statistical metadata defines average length of stay as computed by dividing the number of hospital days, also called bed-days or in-patient days, running from the date of admission in an in-patient institution and calculated as date of discharge minus date of admission, by the number of discharges including deaths during the year.[1] The corresponding statistics article puts it as the total number of nights spent in hospital divided by the total number of discharges.[2]
Two features of that definition are load-bearing. The numerator is calendar-date arithmetic rather than nights actually slept, so a patient admitted one afternoon and discharged the next morning contributes one day. And the denominator includes deaths, which is correct for a hospital activity measure and means the figure is not a measure of recovery time.
The population it covers depends on a definition that the same statistical authority states two ways. Its metadata defines an in-patient as a patient who receives treatment or care in a healthcare facility, is formally admitted, and requires an overnight stay. Its statistics article says an in-patient is formally admitted and stays for a minimum of one night or more than 24 hours.[1][2] Those are not the same test, and the divergence is treated in inpatient care.
A non-resident series does exist
This is the part most commonly got wrong. Eurostat’s dissemination list for its hospital discharge collection includes discharges of non-residents, with sub-tables for in-patients, day cases, bed-days and average length of stay, mirroring the equivalent resident series, and it also publishes non-residents as a percentage of all discharges.[1] So an official average length of stay for non-resident hospital patients is published in the European Union.
Two qualifications keep it from being a medical tourism figure. The split is by residency, not by purpose, so it includes tourists who were injured, lorry drivers, expatriates and patients arriving under European entitlement arrangements along with anyone who travelled deliberately for treatment. And the harmonised series is young: the metadata records that harmonised time series begin at reference year 2023, when reporting became mandatory under a 2022 regulation, with earlier data in a legacy collection of varying availability.[1]
No figures from the non-resident series are reproduced here. Its existence is verified from the dissemination list; which countries actually populate it, and for which years, was not checked for this entry.
For context, the all-patient figures
In 2023 there were around 68.2 million hospital discharges of in-patients in the European Union and around 46.9 million day case discharges, with the statistics article noting that these totals include discharges of residents and non-residents and that the figures are based on hospital administrative data.[2] Average length of stay ranged in most member states from 5.2 days in Bulgaria to 9.4 days in Hungary, a qualifier that belongs with the figures since it excludes countries outside that range.
Day cases are close in magnitude to in-patient discharges and are published separately, so a hospital’s reported admissions change by a large factor depending on which bucket they fall in. The two should not be added, and neither alone is total hospital activity.
Treatment duration is a third quantity again
Latvia’s medical tourism collection publishes what it calls duration of treatment in days and average duration of treatment in days, crossed with sex, service form and country of usual residence, with inpatient services measured in days and outpatient and day-hospital services in visit days.[3] That is neither hospital length of stay nor nights in the country. A patient may be in treatment for three weeks while occupying a bed for two nights.
The traveller-side measure is different again. One national statistics office reported an average length of visit of 7.0 nights across all overseas-resident visits in 2018, down from 7.3 the previous year, and an American survey reports an average stay of 16.9 nights for overseas visitors.[4][5] Neither is medical, and both are nights in the country rather than nights in a bed.
Reading a stay figure in this sector
Clinic and facilitator material frequently quotes a recommended stay of seven to fourteen days for a given procedure. No statistical collection located for this entry produces such a figure, and it should be treated as provider-supplied planning guidance rather than a measurement. The three quantities a reader should keep apart are the hospital stay, defined as above; the treatment duration, which may be much longer; and the trip length, which includes recovery time before it is safe to fly.
See also
- Inpatient care, the definition this statistic depends on, stated two ways
- Day surgery, the category that sits outside the in-patient count
- Hospital discharge data in medical tourism, the collection this series belongs to
- Average expenditure per medical traveler, the same averaging problem applied to money
References
- Eurostat. Hospital discharges and length of stay, ESMS metadata, hlth_hosd. Metadata last updated 15 December 2025. Verified against primary record: the length of stay formula, the in-patient and day case definitions, the legal basis and the disseminated resident and non-resident dataset list were read in the metadata. Retrieved 9 October 2026.
- Eurostat. Hospital discharges and length of stay statistics. Statistics Explained, data extracted December 2025. Verified against primary record: formula, in-patient definition, discharge totals and country range read. Retrieved 9 October 2026.
- Centre for Disease Prevention and Control of Latvia. Medical tourism statistics tables, with the accompanying metadata. Official Statistics Portal of Latvia, tables last updated 31 July 2026. Verified against primary record: unit definitions and dimensions read; cell values not retrieved. Retrieved 9 October 2026.
- Office for National Statistics. Travel trends, 2018. Released 24 May 2019. Verified against primary record: average length of visit read. Retrieved 9 October 2026.
- United States National Travel and Tourism Office. 2025 Survey of International Air Travelers results. Undated on the page. Verified against primary record: average nights read from the published results. Retrieved 9 October 2026.
Sourcing note: the statistical metadata, the statistics article, the Latvian tables and metadata and the two travel releases were opened and read on 9 October 2026. The existence of a non-resident average length of stay series is verified from Eurostat’s own dissemination list; no figures from it are published, because which countries populate it was not checked. The two traveller figures are for all visitors, not medical travellers, and are given only as contrast. The in-patient definition is reported in both of the forms the same authority publishes, without reconciling them.