As a target test, CBC is performed in patients who have or are suspected to have anemia, polycythemia, infection, leukemia, or thrombophilia, among various conditions. 9 It is routinely conducted in patients that are admitted to the hospital and is frequently performed in patients that attend a general practice. 8 It is recommended to be performed in every healthy person as a screening test once per year. 5-7Ĭomplete blood count (CBC) is the most commonly performed laboratory test. 3 Although several standards exist for preparing patients for blood specimen donation, as well as for blood specimen collection and handling procedures, the estimated degree of conformity to these guidelines is still unacceptable. 3, 4 Therefore, conforming to guidelines while performing specimen collection, handling, and processing variables is required. 1, 2 Errors occurring during this phase may arise from improper preparation of the patient incorrect collection procedure incorrect transport, preparation, and labelling of specimens and endogenous physiological and pathophysiological variables. The credibility of the results of analyses is associated mostly with the quality of the preanalytical phase of laboratory testing. The effectiveness and trustworthiness of laboratory service results from the amalgamation of accuracy, precision, and rapidity of the results delivered to health care professionals and patients. Complete blood count, fasting, reference standards, preanalytical phase, capillary blood
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