If the virus becomes active after being latent, it causes the disorder known as shingles, or herpes zoster. The virus spreads in the ganglion and to the nerves connecting to it. Nerves most often affected are those in the face or the trunk. The virus can also spread to the spinal cord and into the bloodstream.
About this Procedure. The sniff test is a fluoroscopic exam used to check how the diaphragm (the muscle that controls breathing) moves during activities such as breathing normally and inhaling rapidly. Your diaphragm normally moves down when you inhale, and up when you exhale.
Small amounts of X-rays are passed through the body. When a special X-ray detector is exposed to the absorbed X-rays, a detailed picture of the diaphragm is captured. The radiologist or technologist will have you sniff or quickly breathe in through your nose and then take pictures of your diaphragm. The exam takes about 15 minutes. A sniff test allows your doctor to see if your diaphragm moves in the proper direction. Read this handout to learn how the exam works, how it is done, how to prepare for it, what to expect during the exam, and how to get your results.