As mentioned in Chapter 1, critical values are those that are outside the reference range and that demand immediate action by the operator or technologist. A list of critical values is given in Table 2.6. If a patient presents with a critical value on a CBC, the physician or unit must be notified immediately. Records of this communication are essential and are a major part of quality assurance. All technologists should realize the importance and urgency of acting appropriately once a critical value has been obtained.
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