The Lewis System

Continuing Education Information

For Continuing Education credit you must read this page.

Release date: August 12, 2015

Expiration date: August 12, 2023

Target Audience: This activity has been designed to meet the needs of healthcare professionals, specifically medical laboratory scientists.

P.A.C.E.® approved programs are accepted by the ASCP-BOC for recertification, and for license renewal in all licensure states except Florida.

  • Describe the Lewis system in terms of genetic interactions, the formation and secretion of Lewis antigens, clinical significance of antibodies produced, and transient phenotypes.
  • Given results of a secretor inhibition study, correctly interpret whether substances are present or not present. Based on these results, apply your knowledge of gene interaction to identify the likely Le, Se, and ABH genes present.

Estimated Completion Time (including post-test): 38m

Method of Participation: To receive a statement of credit, you must:

  1. Watch the video in its entirety
  2. Successfully complete the video post-test (80% or higher)
  3. Submit certificate completion information
  4. Receive the course evaluation

NO FEE is associated with this continuing education activity. All CE credit granted on this website ( is provided as a service to medical laboratory professionals as part of the academic mission of the University of Utah’s Department of Pathology and ARUP Laboratories. After completing the post-test and submitting your information where prompted, a certificate will be generated and available for printing or saving.

P.A.C.E.® Accreditation: The program has been approved for 0.5 contact hour(s) through ARUP Laboratories, which is approved as a provider of continuing education programs in the clinical laboratory sciences by the American Society for Clinical Laboratory Sciences (ASCLS) P.A.C.E.® Program.

Course Director: Barbara Bonke, ASCP

Faculty: Justin R. Rhees, MS, MLS(ASCP)CM SBBCM

Disclosure: Neither the speaker(s), planner(s), nor anyone in control of content for the enduring material video, The Lewis System, have any relevant financial relationship with commercial products or services discussed today.

References: Individual courses will provide explanations and references for the content covered by the quiz section of the course. Additional references are available at and

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Launch Lecture Video