For a do not resuscitate (DNR) order to be valid, it must:

• A. be dated within the previous 24 months
• B. clearly state the patient's medical problem
• C. be updated a minimum of every 6 months
• D. be signed by the local justice of the peace

Answer: (B)

A valid do not resuscitate (DNR) order must clearly articulate the patient's wishes regarding resuscitation efforts, which includes stating their medical problem. This clarity ensures that healthcare providers understand the patient’s condition and intentions regarding end-of-life care. It's essential for the DNR to specify the medical problem as it helps to establish the context for why resuscitation efforts might be deemed inappropriate. This specificity also serves to prevent confusion and potential disputes among medical staff and family members when making critical decisions about a patient's care.

Other options may present procedural or logistical aspects related to DNR orders but do not address the necessity of clearly stating the patient's medical issue, which is crucial for the legitimacy of the order in a clinical setting.