Which of the following is not an appropriate guideline for phlebotomists to follow?

The guideline suggesting the use of one form of patient identification is not appropriate because proper patient identification is critical in phlebotomy to ensure the correct patient is matched with their specimens. The standard practice typically involves using at least two forms of identification, such as the patient’s name and date of birth, or a medical record number, to minimize the risk of errors and to enhance patient safety.

In contrast, using aseptic technique at all times is essential to prevent contamination and infection during blood collection. Maintaining patient confidentiality is a fundamental ethical and legal obligation to protect the patient's personal health information. Additionally, labeling tubes after blood has been drawn ensures accurate tracking of specimens and avoids mix-ups in the laboratory process. Therefore, the emphasis on diversifying patient identification methods is a critical protocol not reflected in the option suggesting the use of only one form.