Alzheimer’s illness (AD) is likely one of the most prevalent and clinically difficult neurodegenerative issues worldwide [1]. In 2024, it impacts almost 7 million Individuals aged 65 and older, and as populations proceed to age, U.S. care prices are anticipated to exceed $1 trillion yearly by 2050 [2]. Globally, AD instances are projected to rise to 78 million by 2030 and 153 million by 2050, putting an immense socioeconomic and healthcare burden on societies [3]. Though the exact etiology of AD stays elusive, in depth proof implicates amyloid-β (Aβ) misfolding, tau hyperphosphorylation, and their irregular aggregation as key drivers of neuronal harm and demise, finally resulting in irreversible cognitive decline [4]. As a progressive and presently incurable situation, present therapeutic methods for AD are restricted to symptomatic aid and modest delays in illness development [5]. Nonetheless, growing proof signifies that neuronal and synaptic dysfunction in the course of the earliest levels of AD precedes irreversible neurodegeneration and will stay partially reversible [6]. On this context, figuring out people in danger and intervening throughout this crucial window might considerably sluggish illness development, enhance affected person outcomes, and scale back the overwhelming burden on households and healthcare methods [7]. However, early-stage AD usually stays clinically silent; by the point sufferers exhibit noticeable signs, the optimum intervention window has often closed, rendering well timed therapy exceedingly difficult [8]. To deal with this, growing extra accessible and scalable instruments for early AD prognosis and screening has grow to be a central objective in each medical apply and analysis.
At the moment, quite a few early diagnostic strategies for AD have been developed, primarily together with genetic testing [9], cognitive and neuropsychological evaluation [10], neuroimaging methods [11], and physique fluid biomarker evaluation [12]. Genetic testing is especially efficient for detecting familial AD instances, however it offers restricted predictive worth for sporadic AD, which constitutes the overwhelming majority of instances. Cognitive assessments are non-invasive and cost-effective, but they sometimes lack enough sensitivity to detect impairments on the preclinical stage. Neuroimaging methods, together with magnetic resonance imaging (MRI) and positron emission tomography (PET), present high-resolution insights into structural and practical mind adjustments, although they’re usually costly and out there solely at specialised medical facilities. Physique fluid biomarker evaluation, such because the measurement of Aβ and tau proteins in cerebrospinal fluid (CSF), can present direct proof of pathological adjustments however sometimes requires lumbar puncture (spinal faucet). Collectively, these approaches present complementary info, however their use for broad screening stays restricted by price, accessibility, procedural complexity, and, in some settings, suboptimal accuracy. Level-of-care testing (POCT) applied sciences have not too long ago gained consideration as a promising method to addressing this hole [13]. By enabling decentralized, well timed, and accessible biomarker evaluation with out reliance on specialised laboratory infrastructure, POCT gives a possible and scalable answer to develop diagnostic attain and assist large-scale screening efforts. Subsequently, there may be an pressing want for diagnostic instruments which can be correct, speedy, cost-effective, scalable, and user-friendly, in addition to for transportable or home-testing units that allow early AD detection and population-level screening, together with amongst older adults and amongst middle-aged adults over 30 years outdated.
On this evaluate, we define the present understanding of AD pathogenesis and development and summarize present medical approaches for early AD detection, highlighting their respective strengths and limitations. The core focus of this evaluate is to systematically look at latest advances in POCT applied sciences for early prognosis and large-scale inhabitants screening (Fig. 1). We categorize and evaluate consultant POCT platforms with respect to their sensing mechanisms, analytical efficiency, and translational potential. Lastly, we discover future instructions in POCT improvement and current our views on potential methods to beat present limitations and improve its medical applicability for early AD prognosis. The event of POCT applied sciences for AD has the potential to make a significant medical impression on the growing older inhabitants and to profit public well being and healthcare methods.