Laboratory developed test

Laboratory developed test (LDT) is a term used to refer to a certain class of in vitro diagnostics (IVDs) that, in the US, were traditionally regulated under the Clinical Laboratory Improvement Amendments program.[1]

Laboratory developed test
Medical diagnostics

United States

In the United States, the Food and Drug Administration (FDA) has determined that while such tests qualify as medical devices, FDA will allow these products to enter the market without prior approval from the Agency. In 2014, the FDA announced that it would start regulating some LDTs.[2][3] In general, however, it has not done so, as of April 2019.[4]

As LDTs do not require FDA 510(k) clearance required by other diagnostic tests, they have been viewed as a regulatory loophole by opponents.[5][6]

Direct-to-consumer

Direct-to-consumer tests are regulated as medical devices, although they are not necessarily reviewed by the FDA.[7]

23andMe direct-to-consumer genetic tests were originally offered as LDTs, but the FDA challenged that and forced the company to submit the test for approval as a class II medical device.[8][9]

Companies

Companies that offer lab-developed tests include Myriad Genetics, Genomic Health, Foundation Medicine, Quest Diagnostics, and LabCorp.[2]

References
  1. "CLIA Overview". CMS. 11 April 2018.
  2. Pollack, Andrew (2014-07-31). "F.D.A. Acts on Lab Tests Developed In-House". The New York Times. ISSN 0362-4331. Retrieved 2019-05-22.
  3. "Laboratory Developed Tests". FDA. 26 March 2018.
  4. https://documents.cap.org/documents/general-ldt-faqs.pdf excerpt=Current oversight requirements governing LDTs are the laboratory requirements prescribed in CLIA. The FDA claims jurisdiction for the oversight of LDTs and exercises an enforcement discretion policy at this time. The FDA has not finalized a plan to regulate LDTs but defers to Congress to draft legislation to address this issue."
  5. Jotwani, Rohan; Boumil, Marcia; Salem, Deeb; Wetterhahn, Madeline; Beninger, Paul (September 2017). "Theranos Experience Exposes Weaknesses in FDA Regulatory Discretion". Clinical Pharmacology in Drug Development. 6 (5): 433–438. doi:10.1002/cpdd.374.
  6. Duhaime-Ross, Arielle (Nov 17, 2015). "FDA wants to close the loophole that Theranos used, but Republicans don't understand why". The Verge. Retrieved 5 April 2018.
  7. Health, Center for Devices and Radiological. "In Vitro Diagnostics - Direct-to-Consumer Tests". www.fda.gov. Retrieved 2018-12-02.
  8. Yarbrough, Knobbe Martens-Daniel K.; Fuller, Michael. "FDA Approval of 23andMe Genomic Test Shows the Way for Direct-to-Consumer Diagnostics | Lexology". Retrieved 2018-12-02.
  9. "23andMe Warning Letter Climaxes 7-Year Dilemma Over Lab-Developed Tests". MDDI Online. 2014-01-14. Retrieved 2018-12-02.


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