Good advice from CPT BRAD. By all means, let someone know where you're going and the route you intend to take. I'd open with the statement, "my name is --- and I need (medical) help. My location is ---, my injuries consist of A, B and C, and I'm losing blood (or consciousness)."
I would certainly add contact information, because my wife seems to know more about my physical condition than I do. If batteries permit, I would remain on the line (or on the air, if it's a radio) in the hope my position can be triangulated, and I would provide updates on my condition or visual contact with an inbound helicopter or rescue vehicle.
Time permitting, tell rescuers what you're doing - "I've applied a tourniquet...a splint...a bandage...etc." Unless pinned in place, try to position yourself to be seen from the air or from a distance. Do NOT take medication unless you are advised to do so. For example, if you're bleeding and take aspirins for a head or leg injury, you will reduce platelet adhesion and extend clotting time. You'll bleed more. If you normally take insulin, advise your contact or rescuers when you last took it or ask if you can take your customary dose. Allergies to insect bites (bee stings, etc)? Ask your physician for a prescription for an Epi-Pen (epinephrine) and include that in your First Aid Kit or scheduled meds. Replace the meds (even the expensive ones) when they expire. Take more water than you believe you'll need and remain well-hydrated.
Experiencing dizziness, nausea, cramps, chills? Advise your rescuers. Have a compass? Take a compass reading on a prominent landmark and report, "The fire lookout tower is in sight, bearing 2-7-0 from my position." Or, "I believe I'm about 300 yards from the stream crossing on the trail."
I'm sure there are ladies and gentlemen with more or better advice than this, but these are the first things that come to my mind. Plan ahead, be careful, and move cautiously.

If you follow Ed's advice even Chad Love could find you!

Well if said life threatening situation was over I would tell the person the my condition, situation, and location and to send help quick! After ERT or SRT was on the way I would describe in more detail what went down, how I got myself in this situation and my emergency contact info. I'd also confirm my coordinants and let them know if I had any food or drug allergies in case I wasn't consious when the good guys show up. Then I'd try to stop the bleeding or leaking of bodily fluids and sit back and wait and try to remain consious.

Assuming i'm lost i would give a location, nothing else matters if i can't be found.

Can you hear me now?

i would say. "hey ya i know diner is at 7, but i dont think can make it. unless you come help me.

PICK ME UP DUMBASS

Where do you guys hunt? Do you really have phone service? The SPOT (and others like it) hasn't been out that long. I learned how to take care of emergency situations in Boy Scouts. The first thing that I do is give my spouse a time that I will be home, and I also leave her a map of the area that I will be in. If I'm not home by a certain agreed upon time, she calls for help (hasn't happened yet). Common sense plays a big part in my outdoor activity, not reliance on technology.

My name, coordinates, and my injuries. Then I would discuss what happened, how long I have been injured and any medicine allergies I have or any medications I am currently taking.

DON'T HANG UP!! I AM IN DANGER AND NEED HELP! Then give name, location. . . .

Nate

Well, my cell phone has a GPS built in. Those help.

State your name, any injuries, and why you need help. Any idea you have on how to get to you, like where you left your car/the road, etc.

Since you shouldn't be just dumb wandering around, you would have had a map or compass, so a statement like; "One mile east of the end of highway 82!" would help.

ummmmmmmm hey I know it's kind sudden but can you save me

tell them what you look like what are your injuries

First thing is the location then what the situation is.

State what damage you have then your position then your name.

i would start out with my name, followed by the nature of the emergency. next would be the extent of any injuries i have incurred and whether or not i can walk. next, if i have any visual signaling aids i would let them know what they are so they would know what to look for. next would be any landmarks i can see from my present location, and what my last known location was. from there i would try to get a time frame from the rescuers for extraction and then establish time intervals to check in with them via my com device and then break contact to conserve battery power.