Diagnosis
In terms of the diagnosis for this condition  one sees the following (though this is not a complete list):
CBC
PT/PTT
Blood gases
Urine test

Prevention
The risk of heat stroke can be reduced by observing precautions to avoid overheating and dehydration. Light, loose-fitting clothes will allow perspiration to evaporate and cool the body. Wide-brimmed hats in light colors help prevent the sun from warming the head and neck. Vents on a hat will help cool the head, as will sweatbands wetted with cool water. Strenuous exercise should be avoided during hot weather, especially in the sun peak hours as well as avoiding confined spaces (such as automobiles) without air-conditioning or adequate ventilation.In hot weather, people need to drink plenty of cool liquids and mineral salts to replace fluids lost from sweating. Thirst is not a reliable sign that a person needs fluids. A better indicator is the color of urine. A dark yellow color may indicate dehydration.Example of a checklist designed to help protect workers from heat stress:
Know signs/symptoms of heat-related illnesses. Block out direct sun and other heat sources. Drink fluids often, and before you are thirsty. Wear lightweight, light-colored, loose-fitting clothes. Avoid beverages containing alcohol or caffeine. Treatment
Treatment of heat stroke involves rapid mechanical cooling along with standard resuscitation measures.The body temperature must be lowered quickly via conduction, convection, or evaporation. The person should be moved to a cool area, such as indoors or to a shaded area. Clothing should be removed to promote heat loss through passive cooling.
Conductive cooling methods such as ice-water immersion should also be used, if possible. Evaporative and convective cooling by a combination of cool water spray or cold compresses with constant air flow over the body, such as with a fan or air-conditioning unit, is also an effective alternative. The person should not be wrapped in wet towels or clothing as this can act as insulation and increase the body temperature.Aggressive ice-water immersion remains the gold standard for life-threatening heat stroke. This method may require the effort of several people and the person should be monitored carefully during the treatment process. Immersion should be avoided for an unconscious person, but if there is no alternative, the persons head must be held above water. Immersion in very cold water was once thought to be counterproductive by reducing blood flow to the skin and thereby preventing heat from escaping the body core. However, research has shown that this mechanism does not play a dominant role in the decrease in core body temperature brought on by cold water. Dantrolene, a muscle relaxant used to treat other forms of hyperthermia, is not an effective treatment for heat stroke.Hydration is important in cooling the person. In mild cases of concomitant dehydration, this can be achieved by drinking water, or commercial isotonic sports drinks may be used as a substitute. In either exercise- or heat-induced dehydration, electrolyte imbalance can result, and can be worsened by excess consumption of water. Hyponatremia can be corrected by intake of hypertonic fluids.