Lactic acid dehydrogenase (LDH) is an enzyme that helps produce energy. It is present in almost all of the tissues in the body and becomes elevated in response to cell damage. LDH levels are measured from a sample of blood taken from a
A gallium scan is a nuclear medicine test that uses a special camera to take pictures of specific tissues in the body after a radioactive tracer (radionuclide or radioisotope) makes them visible. Each type of tissue that may be sc
In otherwise healthy people, it is not usually necessary to distinguish respiratory syncytial virus (RSV) infection from a common cold. A health professional may suspect RSV infection as the cause of symptoms when there is eviden
Cystic fibrosis causes mucus to become thick and sticky. The mucus builds up and clogs passages in many of the body's organs, but mostly in the lungs and the pancreas. The thick and sticky mucus can block pancreatic enzymes f
Bronchoscopy is a procedure that allows your doctor to look at your airway through a thin viewing instrument called a bronchoscope. During a bronchoscopy, your doctor will examine your throat, larynx, trachea, and lower airways.
A tuberculin skin test is done to see if you have ever had tuberculosis (TB) (Mycobacterium tuberculosis). It is done by putting a small amount of TB protein (antigens) under the top layer of skin on your inner forearm. If you have eve
When you give your medical history, your doctor collects information about whether you are likely to have tuberculosis (TB), a bacterial infection. An active infection can spread to other people. A latent infection cannot spread to oth
Diagnosing active TB in the lungs
A lung biopsy removes a small piece of lung tissue which can be looked at under a microscope. The biopsy can be done in 4 ways. The method used depends on where the sample will be taken from and your overall health.
An arterial blood gas (ABG) test measures the acidity (pH) and the levels of oxygen and carbon dioxide in the blood. This test is used to check how well your lungs are able to move oxygen into the blood and remove carbon dioxide from t
A cough is only a symptom, not a disease, and that's why your other symptoms are important.
When to Call a Doctor »Join a Yahoo! Group and discuss topics with other members of the group.
All Respiratory Groups »Search the Web for
Respiratory Health
Play Video
Celebrity nutritionist, Oz Garcia, engages with well-known people in the worlds of…
For a quick and healthy snack, you can’t go wrong grabbing one of this season’s freshest apples. But put the peeler away. Read More »
View All Tips »Tell us what you think about Yahoo! Health - Send us your feedback