(Linda Williams is an employee of the Potter County Department of Emergency Services.)

With National EMS Week (May 20-26) approaching, it's a good time to learn what you should do if someone is badly injured or suddenly becomes sick. Knowing how to call for help in an emergency can save a life.

One call connects you with an emergency medical team - emergency dispatch operators, emergency medical technicians and paramedics - specially trained to handle these situations.

When someone faints or collapses, has persistent chest pain or difficulty breathing, or is badly injured, call 911. Answer the dispatcher's questions as completely and honestly as possible. Ask the dispatcher to explain any question you don't understand; do not just guess at an answer.

When should you call for an ambulance instead of driving to the emergency department? First, ask yourself the following questions:

+ Is the victim's condition life-threatening?

+ Could the victim's condition worsen and become lifethreatening on the way to the hospital?

+ Could moving the victim cause further injury?

+ Does the victim need the skills or equipment of paramedics or emergency medical technicians?

+ Would distance or traffic conditions cause a lifethreatening delay in getting the victim to the hospital?

If the answer to any of these questions is "yes" or if you are unsure, it's best to call. Sometimes, you may believe that you could get to the hospital faster by driving than by calling an ambulance. However, paramedics and emergency medical technicians communicate with the physician in the emergency department by radio. They are trained to begin medical treatment on the way to the hospital. The crew can also alert the emergency department of the patient's condition in advance.

When calling, be prepared to give the exact address and location of the emergency. Point out any landmarks (nearby intersections, bridges, buildings) that will help the ambulance driver find you.

Don't move the person unless he is in danger. Try to keep him as warm and comfortable as possible. Make it easy for the ambulance driver to spot you by turning on a porch light or marking your location with a flare or bright cloth.

There are some obvious instances where it's not necessary to call 911 -- transportation to a medical appointment, minor injuries, etc. However, if you're not sure whether you should call 911, it's best to place the call and allow the dispatcher to assist you.