Trans-nasal flexible laryngo-oesophagoscopy (TNFLO)

A TNFLO test allows doctors to look at your nose, throat, voicebox and gullet (oesophagus). It is used instead of an endoscopy if you are not fit enough to have a general anaesthetic.
Before a TNFLO test, your doctor sprays your nose and throat with an anaesthetic to numb it.

They insert a thin, flexible tube with a camera and a light at the end (endoscope) into your nose and to the back of your throat. You are awake during the test. It takes about 30 minutes.

You should not eat or drink anything for about an hour after the test, or until the numbness wears off. This is because there is a risk that food and drink may go down the wrong way and into your lungs when you swallow. You could also burn your mouth or throat with hot food or drinks.