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MT(AAB), ELS(AAB), ALS(AAB), MLT(AAB), POLT(AAB), and
PBT(AAB) Credentials

The AAB Board of Registry recognizes individuals at six levels within the clinical laboratory field:

The primary difference between the MT(AAB), MLT(AAB), and POLT(AAB) certifications is one of responsibility and supervisory capabilities in the laboratory. The MT(AAB) (medical technologist) performs tests, including high complexity procedures, with a minimum of supervision.  An MT(AAB) may supervise MLT(AAB)s (medical laboratory technicians), POLT(AAB)s (physician office laboratory technicians), and PBT(AAB)s (phlebotomy technicians).

MLT(AAB)s perform waived and moderately complex clinical laboratory procedures under the supervision of a laboratory director, supervisor, or MT(AAB).

The POLT(AAB) performs a limited number of waived or moderately complex clinical laboratory procedures in physician office and alternate-site laboratories under the supervision of a laboratory director, supervisor, MT(AAB) or MLT(AAB)

The PBT(AAB) performs venipunctures, fingersticks, and other procedures to procure a blood specimen for laboratory testing.

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