Tests and diagnosisBy Mayo Clinic staff
It's usually apparent to doctors if you have heatstroke, but they may order laboratory tests to confirm their diagnosis and rule out other causes of your symptoms. These tests include:
- A blood test to check for low blood sodium or potassium and the content of gases in your blood to see if there's been any damage to your central nervous system
- A urine test to check the color of your urine, because it's usually darker if you have a heat-related condition, and to check your kidney function, which can be affected by heatstroke
- Muscle function tests to check for rhabdomyolysis — serious damage to your muscle tissue
- X-rays and other imaging tests to check for damage to your internal organs
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