Medical Definition of ring test
: a test for antigens or antibodies in which a layer of diluted material suspected of containing antigen is placed over a column of known antiserum in a small test tube or a layer of diluted known antigen is placed over serum suspected of containing antibodies and is then examined for a positive reaction signaled by formation of a thin plane or ring of precipitate
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“Ring test.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/ring%20test. Accessed 23 Jan. 2022.
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