How is a multiplex test performed? Tech PWN November 30, 2020 16:56 Updated This test is conducted by a nasal swab. This requires insertion of a swab into your nose. Related articles Are there any limitations to multiplex tests? What are the benefits of the multiplex test? What will my multiplex test results tell me? What is a multiplex test? Who should not get a multiplex test? Comments 0 comments Please sign in to leave a comment.