The hallmark symptoms are fever greater than 100.4 degrees F (38.0 degrees C) and cough, difficulty breathing, or other respiratory symptoms. Symptoms in the order of how commonly they appeared have included:

• Fever
• Chills and shaking
• Muscle aches
• Cough
• Headache

Less common symptoms include (also in order):

• Dizziness
• Productive cough (sputum)
• Sore throat
• Runny nose
• Nausea and vomiting
• Diarrhea

Your health care provider may hear abnormal lung sounds while listening to the chest with a stethoscope. In most persons with SARS, worsening chest x-ray or chest CT changes show the presence of pneumonia or respiratory distress syndrome.

Tests tests used to diagnose SARS might include:

• Blood clotting tests
• Blood chemistries
  • ALT and CPK are sometimes elevated.
  • LDH levels are often elevated.
  • Sodium and potassium are sometimes low.
• Chest x-ray or chest CT scan
• Complete blood count (CBC)
  • White blood cell (WBC) count may be low.
  • Lymphocyte count may be low.
  • Platelet count may be low.

Much attention was given early in the outbreak to developing a quick, sensitive test for SARS. Specific tests include the PCR test for SARS virus, antibody tests for SARS, and direct SARS virus isolation. All current tests have some limitations.