A patient can be said negative for COVID-19 only when their RT-PCR test is negative, meaning, a Ct value around 35 or more.
Positive results are indicative of active infection.
A Ct value greater than 35 is considered to be COVID negative and a Ct value less than 35 is considered to be COVID positive.
Molecular test aka RNA or PCR test These diagnostic tests are considered the most sensitive for detecting an active infection, and the results are highly accurate.
Even though most of us have now taken a lateral flow test at some point, it's important to always read the instructions.
Again, Ct values may differ between nasal and oropharyngeal specimens collected from the same individual.