Law & Medicine

An overlooked laboratory report



Question: Your office assistant misfiled a critical laboratory report showing dangerous hyperkalemia of 6.5 mEq/L. Unaware of the abnormality, you failed to notify the end-stage renal patient to return for treatment. In the meantime, the patient collapsed and died, and an autopsy revealed a fresh transmural myocardial infarct.

Which of the following statements is best?

A. You are negligent, because the standard of care is to promptly contact the patient.

B. Your office assistant is negligent, because she was the one who misfiled the report.

C. Liability rests with the laboratory, because it should have called the office immediately with the critical value.

D. Your lawyer will defend you on the legal theory that hyperkalemia was not the proximate cause of death.

E. All of the above.

Answer: E. In any negligence action, the plaintiff bears the burden of proof, on a balance of probabilities, that the defendant owes him/her a duty of care, the breach of which proximately caused the plaintiff’s injuries.

One begins with an inquiry into whether a duty exists and whether a breach has occurred. Generally, doctors owe a legal duty of due care to their patients arising out of the doctor-patient relationship. By “missing” the laboratory report, especially one of urgency, and not immediately notifying the patient, the doctor has likely breached his/her duty. Another way of putting it is to ask whether the conduct has fallen below what is ordinarily expected of a practitioner in a similar situation.

The doctor will likely blame the office assistant for misfiling the report, and the assistant is indeed liable, as he/she also owes a direct legal duty to the patient. However, such liability will then fall upon the doctor under “respondeat superior” or “let the master answer,” which is the legal doctrine underpinning vicarious liability. This is characteristically seen in an employer-employee situation, where liability is imputed to the employer despite the tortious act being committed only by the employee.

The idea behind this rule is to ensure that the employer, as supervisor, will enforce proper work conditions to avoid risk of harm. The employer also is better able to shoulder the cost of compensating the victim.

For vicarious liability to arise, the employee’s act must have occurred during and within the scope of employment, and the risk of harm must be foreseeable. Under the facts of this hypothetical scenario, it is easy to see that the doctor will be vicariously liable for the negligent act of the assistant.

The clinical laboratory also owes an independent duty to the patient, which includes, among other things, assuring the proper standards in specimen collection and test performance. The duty extends to timely and accurate reporting of the results, including calling the physician when there is a critically high or low value if that is the standard of care in the community, as it generally is.

Thus, the laboratory in this case will likely be named as a codefendant. This is called joint and several liability, where more than one defendant has concurrently or successively caused a plaintiff’s indivisible injury, and the latter can recover all damages from any of the wrongdoers irrespective of degree of fault, as long as causation is proven. However, the plaintiff is not entitled to double recovery, and a defendant can proceed against the other liable parties for contribution.

Proving existence and breach of duty are necessary but insufficient steps toward winning the lawsuit. The plaintiff must also establish causation, i.e., that the substandard care caused the injury.

Causation inquires into both cause-in-fact and cause-in-law, and the term “proximate cause” is used to cover both of these aspects of causation. Cause-in-fact is established with the “but for” test – whether it can be said that had it not been for the defendant’s actions, the plaintiff would not have suffered the injury.

In this scenario, the doctor’s attorney will argue that the cause of death, a myocardial infarct, was preexisting atherosclerotic heart disease, rather than hyperkalemia. Besides, the chronic renal patient typically adapts to hyperkalemia and can tolerate elevated levels better than nonrenal patients. Of course, the counterargument is that the patient’s cardiac injury was a likely consequence of hyperkalemia-induced ventricular arrhythmia.

The doctor, the nurse, and the laboratory will all be named as codefendants. However, the laboratory will attempt to escape liability by arguing that its negligence, if any, was superseded by the doctor’s own negligent failure to read the report. Cause-in-law analysis examines whether a new independent event has intervened between the negligent act and the outcome, which may have been aggravated by the new event.


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