Final answer:
The core body temperature is the most important piece of information for EMS professionals to make management decisions in stable patients with hypothermia in the field.
Step-by-step explanation:
The best piece of information that allows EMS professionals to make the best management decisions in an otherwise stable patient with hypothermia in the field is The core body temperature.
The core body temperature is a critical factor in determining the severity of hypothermia and guides the treatment approach. By knowing the core body temperature, EMS professionals can assess the level of hypothermia and make decisions regarding rewarming techniques, fluid administration, and resuscitation measures.
Other pieces of information, such as the color of the patient's skin, mental status, and quality of peripheral circulation, can provide additional clues and contribute to the overall assessment of the patient's condition, but the core body temperature is the most important in making management decisions.