Point-of-Care Testing



Point-of-Care Testing



Learning Objectives


At the conclusion of this chapter, the reader should be able to:


• Define point-of-care testing (POCT).


• Cite some advantages and disadvantages of POCT.


• Differentiate among the four different types of testing categories.


• Analyze a POCT case study.


• Correctly answer case study related multiple choice questions.


• Be prepared to participate in a discussion of critical thinking questions.


• Describe the principle and clinical application of one POCT assay.


• Correctly answer end of chapter review questions.



Key Terms



Point-of-care testing (POCT) is defined as laboratory assays performed near the patient. The development of new POCT assays has been increasing at a rapid rate. POCT testing can include home test kits and handheld monitors. The major advantage is the rapidity of obtaining quality results if the procedure is performed by an appropriately patient or health care provider. The major drawback is cost, particularly if a large volume of testing is done. Other areas of concern include maintenance of quality control (QC) and quality assurance (QA).



Testing Categories


Diagnostic testing that is not performed within a traditional laboratory is called waived testing by The Joint Commission (TJC, formerly known as the Joint Commission on Accreditation of Healthcare Organizations [JCAHO]). The Clinical Laboratory Improvement Acts of 1988 (CLIA ’88) subjects all clinical laboratory testing to federal regulation and inspection. According to CLIA ’88, test procedures are grouped into one of four following categories:



Test complexity is determined by criteria that assess knowledge, training, reagent and material preparation, operational technique, QC-QA characteristics, maintenance and troubleshooting, and interpretation and judgment. Any over-the-counter test approved by the U.S. Food and Drug Administration (FDA) is automatically placed into the “waived” category. POCT falls within the “waived” or “moderately complex” category.



Quality Control Standards


All laboratory testing must meet the same quality standards regardless of where it is performed. State and city governments may enact mandatory regulations, including qualifications of personnel performing the test, which may be more (but not less) stringent than federal regulations. Voluntary participation in QA programs is also available.


The Centers for Disease Control and Prevention (CDC; www.cdc.gov) has invited providers to participate in a new performance evaluation program (HIV Rapid Testing MPEP) that offers the external evaluation of rapid tests for human immunodeficiency virus (e.g., OraQuick Rapid HIV-1 Antibody Test) and other licensed tests (e.g., MedMira Reveal Rapid HIV-1 Test).


Ultimate responsibility and control of POCT reside within the CLIA-certified laboratory and require a minimum of one laboratory staff member to be responsible for each POCT program. Written policies and procedures must be available to all laboratory personnel for patient preparation, specimen collection and preservation, instrument calibration, policies for QC and remedial actions, equipment performance evaluations, procedures for test performance, result report, and recording. The greatest source of error is preanalytic error, such as patient identification and specimen collection.



Non–Instrument-Based Testing


In immunology and serology testing, most POCT testing is done by manual rapid test methods, such as pregnancy testing. More rapid tests are being developed for the identification of infectious organisms, such as group A streptococci and HIV, in emergency rooms, in hospital settings, and even at home. Numerous POCT tests are referenced throughout this book in various chapters. The card pregnancy test is presented as an example in this chapter.



CASE STUDY


MM, a 28-year-old woman, has been trying to get pregnant for the last 6 months. Although she has no health problems, conceiving a child is proving to be difficult. She is considering fertility treatment. Her period is now 10 days late and she has been experiencing pain in her side. She performed an at-home pregnancy test but it was negative.


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Jun 12, 2016 | Posted by in IMMUNOLOGY | Comments Off on Point-of-Care Testing

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