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U.S. Department of Health and Human Services

Recognized Consensus Standards

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Part B: Supplementary Information Sheet (SIS)
FR Recognition List Number 052 Date of Entry 07/15/2019 
FR Recognition Number 2-264
Standard
ASTM F2148-18
Standard Practice for Evaluation of Delayed Contact Hypersensitivity Using the Murine Local Lymph Node Assay (LLNA).
Scope/Abstract
1.1 This practice provides a methodology to use a combination of in vivo and in situ procedures for the evaluation of delayed contact hypersensitivity reactions.

1.2 This practice is intended to provide an alternative to the use of guinea pigs for evaluation of the ability of a device material to stimulate delayed contact hypersensitivity reactions. This alternative is particularly applicable for materials used in devices that contact only intact skin. However, the guinea pig maximization test is still the recommended method when assessing the delayed hypersensitivity response to metals or when testing substances that do not penetrate the skin but are used in devices that contact deep tissues or breached surfaces. This practice may be used for testing metals, with the exception of nickel-containing metals, unless the unique physicochemical properties of the materials may interfere with the ability of LLNA to detect sensitizing substances.

1.3 This practice consists of a protocol for assessing an increase in lymphocyte proliferation in the lymph nodes draining the site of test article administration on the ears of mice.

1.4 The LLNA has been validated only for low-molecular-weight chemicals that can penetrate the skin. The absorbed chemical or metabolite must bind to macromolecules, such as proteins, to form immunogenic conjugates.

1.5 This practice is one of several developed for the assessment of the biocompatibility of materials. Practice F748 may provide guidance for the selection of appropriate methods for testing materials for a specific application.

1.6 Identification of a supplier of materials or reagents is for the convenience of the user and does not imply a single source. Appropriate materials and reagents may be obtained from many commercial supply houses.
Extent of Recognition
Complete standard
Rationale for Recognition
This standard is relevant to medical devices and is recognized on its scientific and technical merit and/or because it supports existing regulatory policies.
Public Law, CFR Citation(s) and Procode(s)*
21 CFR 58 Good Laboratory Practice for Nonclinical Laboratory Studies
Relevant FDA Guidance and/or Supportive Publications*
ISO 10993-12:2012 Biological evaluation of medical devices - Part 12: Sample preparation and reference materials.

Guidance for Industry and Food and Drug Administration Staff: Use of International Standard ISO 10993-1, "Biological evaluation of medical devices--Part 1: Evaluation and testing within a risk management process", Issued June 2016.
FDA Technical Contacts
 Annabelle Crusan
  FDA/OC/CDRH/OPEQ/OHTII/DHTIIB/
  301-796-4926
  Annabelle.Crusan@fda.hhs.gov
 Chandramallika (Molly) Ghosh
  FDA/OC/CDRH/OPEQ/OHTV/DHTVB/
  301-796-6496
  molly.ghosh@fda.hhs.gov
Standards Development Organization
ASTM ASTM International http://www.astm.org/
FDA Specialty Task Group (STG)
Biocompatibility
*These are provided as examples and others may be applicable.
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