Lab tests, including nose and throat cultures and blood work, are carried out to find out whether your cold was caused by a coronavirus, but there’s no reason to. The test results wouldn’t change how you treat your symptoms, which typically go away in a few days.
But if a coronavirus infection spreads to the lower respiratory tract (windpipe and lungs), it can lead to pneumonia, especially in elderly people, people with heart disease, or people with weakened immune systems.
Creditable Source: WHO and CDC