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.

How we can help

Macmillan Cancer Support Line
The Macmillan Support Line offers confidential support to people living with cancer and their loved ones. If you need to talk, we'll listen.
0808 808 00 00
7 days a week, 9am - 5pm
Email us
Get in touch via this form
Chat online
7 days a week, 9am - 5pm
Online Community
An anonymous network of people affected by cancer which is free to join. Share experiences, ask questions and talk to people who understand.
Help in your area
What's going on near you? Find out about support groups, where to get information and how to get involved with Macmillan where you live.