Intermediate Care Units Save Money, But Clinical Gains Remain Unclear, Review Finds

Intermediate care units have quietly become one of the most contested spaces in modern hospital design. Sitting physically and clinically between a general ward and an intensive care unit, they promise enhanced monitoring and selected organ support without the full staffing intensity of an ICU. As health systems across the Organisation for Economic Co-operation and Development have expanded these units, a fundamental question has lingered: do they actually improve patient outcomes, or do they merely reshuffle patients and costs? A new systematic review published in BMC Health Services Research by Jens Detollenaere and colleagues at the Belgian Health Care Knowledge Centre offers the most comprehensive answer to date, and the findings are a study in nuance.

The research team systematically searched three databases for comparative studies conducted in OECD countries, screening records in duplicate and extracting data with a standardised template. Methodological quality was assessed using relevant National Institutes of Health evaluation tools. The window of evidence stretched from 2013 to 2025, capturing more than a decade of experience with these units as they proliferated under various names and organisational models. In the end, twenty-eight studies met the inclusion criteria, forming the evidentiary backbone for an assessment of mortality, length of stay, hospital readmissions, ICU readmissions, costs, and adverse events in adult patient populations.

The first striking finding is how inconsistent the evidence is. Mortality patterns did not point in a single direction: some studies suggested potential benefits of intermediate care, others reported no clear differences, and still others highlighted potential risks for certain patients. According to the review, these discrepancies were often linked to differences in case-mix and admission criteria, meaning that who gets admitted to an intermediate care unit may matter as much as the unit itself. This is a familiar problem in health services research, where the intervention is not a drug with a fixed dose but a flexible organisational arrangement that varies from hospital to hospital and country to country.

Length of stay outcomes were similarly inconsistent. Some studies associated intermediate care units with shorter hospital stays, plausibly because enhanced monitoring allows earlier de-escalation from intensive care or faster recognition of deterioration on general wards. Others reported minimal or no improvement at all. The heterogeneity here mirrors the mortality findings and underscores a central methodological challenge: without standardised definitions of what constitutes an intermediate care unit, comparing results across studies becomes an exercise in approximation rather than precision. Units described under the same label may differ in nurse-to-patient ratios, physician coverage, available organ support, and the acuity of patients they accept.

Readmission outcomes offered somewhat more consistency, though not the kind advocates of these units might have hoped for. Rates of hospital readmission generally did not differ substantially between patients managed in intermediate care units and those treated in alternative levels of care. Advantages in reducing ICU readmissions, one of the theoretical selling points of step-down and step-up intermediate care, were uncommon across the reviewed literature. In other words, the evidence does not currently support the idea that routing patients through intermediate care reliably prevents them from bouncing back to intensive care or returning to hospital shortly after discharge.

Where the evidence does converge is on money. Cost savings were more consistently observed, with many studies indicating lower hospital expenditure when patients were managed in intermediate care units rather than in intensive care. The economic logic is straightforward: intensive care beds are among the most expensive resources in any hospital, dominated by high staffing ratios, continuous monitoring, and expensive technology. If clinically appropriate patients can be safely managed one step down, the marginal cost per patient falls. Yet the review adds an important caveat, noting that these savings were occasionally accompanied by unfavourable clinical trade-offs in specific patient groups, a reminder that financial efficiency and clinical safety do not automatically travel together.

Adverse event rates, by contrast, were generally comparable across settings. This is arguably reassuring: it suggests that, on balance, moving appropriately selected patients into intermediate care does not systematically expose them to more harm than keeping them in intensive care or on general wards. But comparability is a modest benchmark. The review’s overall verdict is that effects on mortality and length of stay remain inconclusive, largely because of methodological and organisational heterogeneity across the evidence base, while the case for cost savings is the most consistent signal in the literature.

The pattern that emerges is one of selective benefit. Intermediate care units appear most useful for moderate-risk populations, patients too unstable for a general ward but not sick enough to require full intensive care. For these patients, enhanced monitoring at lower staffing intensity represents a rational middle ground. For high-risk patients, however, the suitability of intermediate care is uncertain, and the review suggests that admitting the wrong patients into these units could carry risks. Patient selection, in other words, is not a bureaucratic detail but the decisive variable that determines whether an intermediate care unit helps, does nothing, or harms.

For hospital planners and policymakers, the implications are significant. Many health systems face simultaneous pressures of ageing populations, rising critical care demand, and constrained budgets. Intermediate care units have been promoted as a way to relieve ICU congestion, improve patient flow, and reduce costs simultaneously. The new review partially vindicates that promise on the economic front while cautioning against overclaiming clinical benefits that the current evidence cannot support. It also highlights the danger of treating these units as a one-size-fits-all solution, since their effects appear to depend heavily on local case-mix, admission protocols, and the specific clinical purpose each unit is designed to serve.

The authors argue that standardised definitions, clearer admission criteria, and improved reporting are essential to strengthen future evidence. Until the field agrees on what an intermediate care unit actually is, comparative research will continue to produce the kind of mixed results this review documents. In the meantime, the practical takeaway for clinicians and administrators is a measured one: intermediate care units are a promising and generally cost-saving component of hospital architecture, best deployed for selected moderate-risk patients, and their expansion should be guided by explicit criteria rather than enthusiasm. As these units continue to spread across OECD health systems, the review provides both a warning against uncritical adoption and a roadmap for the research needed to settle the remaining questions.

Subject of Research: Effects of intermediate care units on patient outcomes and hospital resource use in OECD countries

Article Title: The effect of intermediate care units on patient and hospital utilisation outcomes: a systematic literature review

Article References: Detollenaere, J., Van de Voorde, C., Castanares-Zapatero, D., Bouckaert, N., Lefèvre, M., & Van den Heede, K. (2026). The effect of intermediate care units on patient and hospital utilisation outcomes: a systematic literature review. BMC Health Services Research. https://doi.org/10.1186/s12913-026-15737-y

Image Credits: AI Generated

DOI: 10.1186/s12913-026-15737-y

Keywords: intermediate care units, intensive care, systematic review, patient outcomes, hospital costs, length of stay, readmissions, mortality, health services research, patient selection, OECD countries, critical care