What must be determined before treatment and transport of a decontaminated patient?

The determination of proper decontamination is essential before the treatment and transport of a decontaminated patient because it ensures that the patient is no longer a threat to themselves or others from residual contaminants. Effective decontamination minimizes the risk of exposure to hazardous substances, ensuring that emergency responders and healthcare providers can safely provide the necessary medical care without risking cross-contamination.

Confirming that the decontamination has been performed correctly allows healthcare professionals to proceed with treatment, knowing that the patient's condition has been stabilized regarding contamination. It is crucial in emergency response protocols, particularly in scenarios involving hazardous materials, to prioritize this step for the safety of both the patient and the medical team.

The other options, while important in the broader context of patient care, do not take precedence over ensuring that decontamination has been properly conducted before any medical intervention takes place.