It can't already be confirmed if the labtest is not completed yet. It sounds like you still misunderstood the nurse. They're doing a labtest for Coronavirus be

It can't already be confirmed if the labtest is not completed yet. It sounds like you still misunderstood the nurse. They're doing a labtest for Coronavirus because she's been in contact with a nurse who's been in contact with a Coronavirus patient. It is just standard protocol to get tested in that case.