Root cause analysis in transfusion safety
The event described is a classic wrong-patient transfusion, and the question asks which finding represents the
root cause rather than an active error. In patient safety terminology, a root cause is a latent system condition that creates the environment in which individual mistakes can occur. The correct answer is the policy that accepts the bed number as an identifier.
When a transfusion policy permits staff to use the bed number as a patient identifier, it institutionalizes an unstable identifier. Beds are assigned to rooms, not to people; a patient may be moved, or two patients may occupy the same bed at different times. In this scenario, the unit had been crossmatched for another client in the same four-bed room, which means the bed number alone could not distinguish between two different patients. This is a
system-level weakness that will predictably produce wrong-patient errors regardless of which nurse is on duty or how carefully an individual nurse tries to work.
The other three findings are
active errors or
sharp-end failures. Checking the blood unit against the bed tag instead of the wristband is an individual action that violates identification principles. Leaving the bedside before the check is completed, or not staying for the first
15 minutes, are also individual performance issues. These are important, but they are the visible consequences of a deeper problem.
Key point! Fixing only the active errors leaves the latent hazard in place; another nurse on another shift could make the same mistake because the policy still permits a weak identifier.
The distinction between latent conditions and active errors is central to root cause analysis. A latent condition is a pre-existing organizational or environmental factor that lies dormant until it combines with local triggers. In transfusion medicine, misidentification is consistently traced to system vulnerabilities rather than isolated individual negligence. Studies of root cause analysis reports show that patient misidentification involving blood transfusion is frequently linked to failures in the identification process itself, including reliance on non-unique or unstable identifiers. The bed number is precisely such an identifier: it is not permanently attached to the patient, it is not unique to the patient, and it can be shared or changed.
The perioperative and ward settings both illustrate this risk. When identification bands are inaccessible or when staff rely on location-based identifiers, the pre-transfusion bedside check becomes unreliable. A policy that accepts the bed number as an identifier essentially tells staff that a location is an acceptable substitute for a patient-specific identifier. This is not a one-time lapse; it is a standing rule that normalizes the error.
| Finding | Type of error | Why it matters |
|---|
| Policy accepts bed number as identifier | Latent condition / root cause | Systemic weakness; affects all nurses on all shifts; enables wrong-patient errors |
| Nurse checked unit against bed tag, not wristband | Active error | Individual action; follows from the weak policy |
| Second nurse left before bedside check | Active error | Individual action; cosigning away from bedside defeats the check |
| Nurse did not stay for first 15 minutes | Active error / monitoring lapse | Delays detection of a transfusion reaction but does not cause misidentification |
The fatal outcome here began with misidentification, not with the failure to monitor. The patient developed fever, back pain, and hypotension within
15 minutes, which is consistent with an acute hemolytic transfusion reaction from ABO incompatibility. That reaction occurred because the wrong unit was hung. The wrong unit was hung because the identification process allowed a bed number to substitute for a patient-specific identifier.
The monitoring lapse may have delayed recognition, but the root cause of the harm is the identification system failure.
From a nursing licensure examination perspective, this question tests the ability to distinguish
root cause from
contributing factor. A root cause is the deepest underlying system defect that, if corrected, would prevent recurrence of the entire class of events. A contributing factor may worsen the outcome but does not generate the error. The policy accepting the bed number is the only finding that meets the definition of a root cause because it is a pre-existing, system-level condition that made the active errors possible.
Watch out! In root cause analysis questions, the correct answer is usually the system or policy defect, not the individual nurse's action. The bedside check against the bed tag is tempting because it is the most direct cause of the wrong unit being hung, but it is an active error that arose from the defective policy. The question asks what the team should
address, and addressing the policy prevents recurrence across the entire organization.