What is a 'critical laboratory value' and what is typically required when such a value is obtained?

• A. A value outside reference range; routine documentation only
• B. A value from an outside lab; must be re-ordered
• C. A result indicating a life-threatening condition; immediate notification of the ordering provider
• D. A normal result; no action required

Answer: (C)

A critical laboratory value is a result that signals a life-threatening condition or potential rapid deterioration and requires immediate clinical action. When such a value is obtained, the standard practice is to immediately notify the ordering provider (the physician or clinician responsible for the patient’s care) and to document the notification with the time, who was contacted, and any actions or follow-up plans. This rapid communication ensures timely decisions to treat or stabilize the patient and prevent harm. Routine documentation, re-ordering from an outside lab, or no action for a normal result do not reflect the urgent, action-oriented response that critical values demand.