The scientific validity of an analyte establishes the connection between an analyte and a clinical condition or physiological process. It is the first pillar of the performance evaluation of an in vitro diagnostic and answers why the determination of this analyte can be fundamentally meaningful for the intended medical purpose.<\/p>\n
An analyte may be a biomarker, a genetic characteristic, a pathogen component, or another measurable quantity. Scientific validity requires comprehensible evidence of how this analyte is connected to disease, disease risk, progression, or physiological state. The association must fit the specific intended purpose of the IVD, such as screening, diagnosis, prognosis, or therapy monitoring.<\/p>\n
Suitable data sources may include scientific literature, clinical guidelines, results from exploratory studies, or other recognised scientific evidence. The assessment asks not only whether an association has been described somewhere, but whether it is sufficiently justified for the claimed population, specimen, and clinical decision. A marker may be valid for one indication and without demonstrated relevance for another.<\/p>\n
Scientific validity does not address whether a particular test measures the analyte correctly. That question belongs to analytical performance and encompasses, for example, limit of detection, precision, specificity, and robustness of the measurement procedure. A well-validated disease marker is of no use if the test employed captures it unreliably.<\/p>\n
The reverse situation is equally possible: a test may measure with high technical precision even though the clinical relevance of the analyte for the claimed application is not established. Only together with analytical and, where applicable, clinical performance does the foundation of the performance evaluation emerge. The existing entry performance-evaluation designates the overarching process, not this individual pillar.<\/p>\n
The justification should make the evidence sources, the prevailing scientific consensus, and remaining limitations transparent. For novel biomarkers, it is particularly important to explain whether the observed association is reproducible and how it translates into a clinically usable statement. The manufacturer must not extend the claim beyond the established analyte\u2013condition relationship.<\/p>\n
If the intended purpose changes, a new validity question may arise. An analyte previously used for disease monitoring is not automatically established for population-wide screening. Therefore, the performance evaluation must tailor the scientific foundation to the claimed use in each case.<\/p>\n
Scientific validity must also make clear whether the analyte is directly or only indirectly connected to the claimed condition. For an indirect marker, a constellation of other factors may influence interpretation. The justification should therefore explain the biological or pathophysiological basis as well as known limitations of the association. A statistical correlation without a medically comprehensible link does not automatically carry the same weight as an established causal marker.<\/p>\n
For genetic or rare analytes, the available data volume may be limited. In such cases, what matters is how consistent the sources are, whether the target population is sufficiently described, and whether the clinical statement remains closely tied to the boundaries of the evidence. Scientific validity does not require artificial certainty, but a transparent justification of what the analyte can and cannot indicate for the intended application.<\/p>\n
This first pillar of the performance evaluation also influences the selection of the comparator method. If it is unclear which clinical condition serves as the reference, the subsequent clinical performance cannot be cleanly determined. The planning decision must therefore define the scientifically accepted reference point and the handling of borderline or mixed cases.<\/p>\n
The evidence for scientific validity may change over time. New classifications of a disease or new insights into biological heterogeneity may limit or refine the relevance of an analyte for the intended application. The manufacturer must therefore update the literature assessment when such findings affect the claim of the IVD.<\/p>\n
For multiple analytes, it is also necessary to justify which combination supports the clinical statement. A panel is not valid simply because each individual analyte has a known connection to a condition. The data must support the intended interpretation of the entire combination.<\/p>\n
Performance studies can support scientific validity when they specifically investigate the relationship of an analyte to the clinical condition. The study protocol must then define which reference definition, which specimen population, and which clinical criterion will assess the association. A study on measurement precision alone does not answer this question.<\/p>\n
Full-service CROs such as Mediconomics support the translation of the intended clinical statement into a performance study design, the definition of suitable comparator methods, the management of specimen and metadata, and the medical writing of the scientific validity justification.<\/p>\n
Is a frequently published biomarker automatically scientifically valid?<\/strong><\/p>\n No. The publications must comprehensibly support the association for the specific medical intended purpose and target population.<\/p>\n Can an analytically precise test be marketed without scientific validity?<\/strong><\/p>\n Measurement quality alone is not sufficient if the clinical relevance of the analyte for the claimed application is not established.<\/p>\n Is scientific validity identical to clinical performance?<\/strong><\/p>\n No. It concerns the fundamental analyte\u2013condition relationship; clinical performance evaluates the capability of the IVD in the clinical setting.<\/p>\n The scientific validity of an analyte establishes the connection between an analyte and a clinical condition or physiological process. It is the first pillar of the performance evaluation of an in vitro diagnostic and answers why the determination of this analyte can be fundamentally meaningful for the intended medical purpose. Relationship between analyte and condition […]<\/p>\n","protected":false},"author":10,"featured_media":0,"parent":0,"template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"glossary-cat":[24],"class_list":["post-8067","glossary","type-glossary","status-publish","hentry","glossary-cat-medizinprodukte-ivd"],"acf":[],"related_terms":"","external_url":"","internal_reference_id":"","_links":{"self":[{"href":"https:\/\/mediconomics.com\/en\/wp-json\/wp\/v2\/glossary\/8067","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mediconomics.com\/en\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/mediconomics.com\/en\/wp-json\/wp\/v2\/types\/glossary"}],"author":[{"embeddable":true,"href":"https:\/\/mediconomics.com\/en\/wp-json\/wp\/v2\/users\/10"}],"version-history":[{"count":0,"href":"https:\/\/mediconomics.com\/en\/wp-json\/wp\/v2\/glossary\/8067\/revisions"}],"wp:attachment":[{"href":"https:\/\/mediconomics.com\/en\/wp-json\/wp\/v2\/media?parent=8067"}],"wp:term":[{"taxonomy":"glossary-cat","embeddable":true,"href":"https:\/\/mediconomics.com\/en\/wp-json\/wp\/v2\/glossary-cat?post=8067"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Regulatory references<\/h2>\n
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