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Lizzie Tuckey, managing director of Scan.com, explains that the NHS diagnostic backlog isn’t a capacity problem – it’s a pathway problem.
Something is shifting in how patients are accessing healthcare, and diagnostic delays are at the heart of it.
It is not a dramatic shift, but in some ways it is more significant: as more patients choose different ways to seek and access care, those decisions are beginning to reshape the UK’s diagnostics landscape.
Over 1.1 million private diagnostic tests and scans were delivered in 2024 alone, a double-digit increase on the previous year. The UK diagnostic imaging market now stands at £10.7 billion. Meanwhile, nearly 2 million patients are currently waiting for diagnostic tests within the NHS, and almost half of NHS trusts are missing their six-week wait target. These figures reflect a system under sustained pressure, with a growing number of patients who, faced with waits averaging six to 12 weeks, are looking for alternatives.
The assumption has long been that private healthcare is primarily for patients with insurance or those able to pay. But we are seeing something different.
Our data shows growing demand from patients in their 30s, 40s and 50s who are choosing to access scans directly rather than waiting for traditional referral routes. Those aged 30-59 now represent 56% of our scan activity, marking this life stage as a key window for proactive diagnosis and early intervention.
Not lifestyle checks
Almost half of scans in this age group relate to chronic pain or musculoskeletal problems. These are not lifestyle checks – they are real health conditions where imaging often determines the next stage of treatment, and delayed intervention directly translates into longer absences from work and, in some cases, avoidable deterioration.
These patients are not bypassing the NHS out of preference; they are responding to a bottleneck that affects their daily lives. For someone balancing work, family and the psychological burden of an undiagnosed symptom, a scan within 48 hours is not a luxury but a rational response to a system that cannot provide timely answers.
This shift is not about impatience or privilege. It is about unmet clinical need and a changing relationship with health information, shaped by longer waiting times and increasingly difficult access to primary care. Patients are arriving at private imaging appointments better informed than ever, having often researched their symptoms, understood the appropriate imaging options and formed a clear understanding of why a scan may be needed.
This raises a legitimate clinical question: what happens to patients who self-refer into private imaging without a clinical framework around their scan?
This is where the difference between a transactional scanning service and a clinically governed imaging pathway really matters. A scan is not an endpoint, and its value depends entirely on whether it is ordered for the right clinical reason, interpreted by a qualified radiologist and followed up by appropriate clinical action where necessary.
Clinically triaged
For us, every referral is clinically triaged. Our analysis of more than 12,000 patients shows that 20-30% were referred on to specialists following their scan, with 25% scanned within seven days of referral and 75% within 19 days. That referral rate is significant. It shows that private imaging done well is not an end-run around clinical governance but an extension of it. For patients who might otherwise have waited weeks for a diagnosis, delivering a faster diagnosis means they can begin the right treatment sooner.
Policy debates still too often frame private diagnostics as a separate track that patients turn to only when the NHS fails them. That framing is increasingly outdated, and it gets in the way of more useful conversations about how our wider healthcare ecosystem should be structured and governed.
The more productive question is: how should private diagnostic capacity become a structured extension of NHS pathways?
GPs already refer patients privately when NHS waits become clinically untenable. Consultants routinely use private imaging to accelerate decision-making. Many integrated care systems are formalising these relationships through outsourcing arrangements.
What is still missing, though, is a consistent framework for doing this well. One that maintains clinical standards, ensures appropriate follow-up and enables patients who have had private imaging to move seamlessly into the next stage of care.
This disconnect has created what I call the diagnostic black hole: a gap where patients struggle to access imaging quickly, or find themselves in limbo after paying for a private scan with no clear route back into NHS treatment.
The consequences are felt across the system. Patients face longer waits, delayed treatment, and unnecessary uncertainty. Clinicians are left without clear onward pathways, adding pressure to already difficult decision-making. Meanwhile, independent-sector capacity remains underused while NHS waiting lists grow, downstream treatment becomes more expensive and pressure on frontline services continues to increase.
Not just a capacity problem
The NHS diagnostic bottleneck is not simply a capacity problem that more scanners will solve. It is a pathway problem: a series of friction points across triage, referral, reporting and follow-up that compound to produce the delays, frustration, and at times poorer health outcomes that patients experience.
The opportunity is to build a genuinely integrated diagnostic system that connects NHS and independent-sector capacity through consistent clinical governance and seamless referral pathways. That would make better use of existing capacity, reduce unnecessary delays and ensure patients receive the right diagnosis at the right time.
Addressing that requires systems thinking, not just capital investment. And private platforms that can deliver the whole pathway – not just the scan – have a meaningful role to play in its redesign.
The diagnostic black hole is real. The choice now for NHS commissioners, policymakers and private providers alike is whether we close it by designing a connected, clinically governed diagnostic system, or continue to let it happen individually and unevenly, with patients left to navigate fragmented routes to diagnosis on their own.
