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Interstitial Lung Disease (cont.)

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How is interstitial lung disease diagnosed?

Interstitial lung disease cannot be diagnosed simply on the basis of a medical history and physical examination. In most cases, a number of diagnostic tests must be used. The symptoms of interstitial lung disease overlap with those of many other conditions, including cardiovascular diseases.

  • Blood tests may help provide direction in the initial stage of diagnosis and rule out other conditions that may have similar symptoms. Measurement of the oxygen level in the arterial blood may also be performed.

  • Imaging studies, such as chest X-rays and CT scans are often the first diagnostic step and may also help rule out other conditions that may cause similar symptoms.

  • Pulmonary function tests (PFTs) are noninvasive tests that measure the function of the lungs. The test involves blowing into a tube that is part of an instrument called a spirometer. This can measure the volume of the lungs as well as the air flow into and out of the lungs.

  • Biopsies or washings may be taken of the lungs and airways during bronchoscopy (examination of the airways with a viewing tube). The removed tissue samples are then examined by a pathologist to establish the diagnosis. In certain cases, open surgical biopsy of the lung may be required to obtain an adequate tissue sample for diagnosis.

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Source: MedicineNet.com
http://www.medicinenet.com/interstitial_lung_disease/article.htm

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