The American Society for Clinical Pathology (ASCP), formerly known as the American Society of Clinical Pathologists is a professional association based in Chicago, Illinois encompassing 130,000 pathologists and laboratory professionals.

Founded in 1922, the ASCP provides programs in education, certification and advocacy on behalf of patients, pathologists and lab professionals. ^[1] In addition, the ASCP publishes numerous textbooks, newsletters and other manuals, and publishes two industry journals: American Journal of Clinical Pathology(AJCP) and LabMedicine.^[2]

The ASCP also promotes National Medical Laboratory Professionals Week (NMLPW) as a time of recognition for medical laboratory personnel and a chance to celebrate their professionalism and be recognized for their efforts. National Lab Week is held annually during the last full week of April.^{[citation needed]}

The current CEO since 2010 is Ervin Blair Holladay, Ph.D., MASCP, SCT(ASCP)^CM who collects an annual salary of US$1 million.

In February 2006, ASCP acquired the cytology product line of the Midwest Institute for Medical Education (MIME).^[3] At the time, it was the only national cytology proficiency testing provider.^[4]

In 2009, ASCP acquired the medical technologist led National Credentialing Agency for Laboratory Personnel (NCA).^[5] The baccalaureate-level certification designations Medical Technologist (MT) and Clinical Laboratory Scientist (CLS) were replaced by Medical Laboratory Scientist, MLS(ASCP)^CM.^[5] The BOC Board of Governors will be composed of five ASCP Fellows (pathologists), five ASCP laboratory professionals, four representatives of ASCLS, two representatives of the Association of Genetic Technologists, eight representatives from the eight participating societies respectively, and one public representative.^[5] The acquisition was criticized by AMT as doing little to further the standing of laboratory professionals.^[6]

In 2021, ASCP acquired the Clinical Laboratory Management Association (CMLA).^[7] CMLA had advocated against laboratory personnel licensure as an unnecessary cost.

The ASCP Board of Registry (BOR) was established in 1928 as the "Registration Bureau for Technicians" as the first certification agency for clinical laboratory personnel in the US.^[9][10] ASCP was the first professional medical organization to set standards for laboratory professionals, which initially only required a recommendation from a member.^[10] Those recommended were subsequently registered with ASCP, hence name the Board of Registry.^[10] In 1931, there were two classifications for registrants: Laboratory Technician (L.T.) and Medical Technologist (M.T.).^[11][9] The L.T. designation was granted to all technicians who met the minimum requirements without the examination.^[11] The M.T. designations was issued to applicants who met rigid requirement of the Board and were individually elected at each annual meeting.^[11] The first certification was issued in 1930 to Paul H. Adams of Fort Wayne, Indiana.^[11][9] In 1933, ASCP began to assess individuals for academic and clinical prerequisites, and those who passed a board examination were granted certification.^[10] The initial certifications included a written and practical component.^[11]In 1935 the title Medical Technologist (MT) automatically to those certified Laboratory Technicians with college degrees.^[9] In 1936, the "Laboratory Technician" designation is retired and subsequent registrants are designated Medical Technologists and the academic requirements were raised to two years of college.^[9] In 1938, the Registry was renamed from the Registry of Technicians to the Registry of Medical Technologists.^[11] As Canadian pathology society did not have a registry, interested Canadian medical technologists sat for the Amereican ASCP MT certification instead.^[8] In 1939, the BOR publishes the first book outlining the educational curriculum for medical technologists entitled Curriculum for Schools of Medical Technology.^[10][9] In 1940, as other organizations began using the same designations, the initials MT(ASCP) were used.^[9][11] In 1944, due to travel wartime restrictions from World War II, the practical component of the certification was discontinued.^[11] In 1948, the written essay portion of the certification was deemed too cumbersome to assess, and the certification was switched to a multiple choice and true-false assessment that could be graded on a machine and provide exam statistics.^[9][11] In 1949, the BOR changed the exam format to a 200 multiple choice question exam as the multiple choice questions were found to be a more reliable indicator than true-false questions.^[12] In 1949, the BOR also created the Board of Schools (BOS) for registering schools.^[12] In 1958, BoR and ASMT assisted with the reclassification of medical technologists, putting them at the professional level in the Civil Service and allowing medical technologists to gain commission status in the US military.^[11]

In 1962, the BoR began requiring 3 years of college for the MT certification.^[11][12] In 1972, the BoR began requiring a Bachelor's degree for the MT certification.^[12]

There were 100,000 certificates issued by 1975, 200,000 by 1980, 300,000 by 1991, 400,000 by 2005, and 500,000 by 2014.^[9]

In 1994, BBOR changed their examination format to Computerized adaptive testing (CAT).^[9]

In 2004, the BOR implemented the Certification Maintenance Program (CMP) requiring continuing education every three years to remain certified.^[9]

In 1949, ASCP stablished the Board of Schools (BOS) for accrediting medical technologist programs and published the Essentials of an Acceptable MT School.^[10] In 1973, following antitrust litigation by the United States Department of Education, the ASCP Board of Schools became the independent National Accrediting Agency for Clinical Laboratory Sciences.^[10][12]

In 2022 ASCP received a multi-year grant over $1M to promote the CDC OneLab initiative, a network of laboratory professionals and testers to support rapid, large-scale responses to public health emergencies.^[17][18]

ASCP offers a number of certifications.^[19] International certifications taken outside the United States are denoted as ASCPⁱ.^[20] As of 2022, there were 580,000 ASCP and 20,800 ASCPⁱ certificates awarded.^[21][22] In 2023, the number of MLS ASCPi applicants exceeded the number of MLS ASCP applicants.

Outside the US, the Philippines is largest ASCPⁱ market with a third of eligible Filipino graduates applying for the MLS (ASCPⁱ) certification annually.^[23] The credential is not required for practice in the Philippines, but is appealing for its international work eligibility, primarily immigration to the United States.^[23][24]