Pulse oximetry to detect early deterioration of patients with COVID-19 in primary and community care settings – NHS England

Take a look at the guidance for a patient who is able to measure the oxygen level in their blood after slipping their forefinger in a pulse oximeter that they have on standby. It gives very clear information about allied symptoms such as breathlessness or coughing that the person might have – and when they should worry and seek medical help or stay at home and see how their condition goes.
View the guidance here