An abdominal wall fat pad biopsy is the removal of a small part of the abdominal wall fat pad. The procedure is done most often to test for amyloidosis.
Abdominal wall biopsy; Biopsy - abdominal wall fat pad
How the test is performed
Needle aspiration is the most common method of obtaining an abdominal wall fat pad biopsy. The skin of the abdomen is cleansed, and a local anesthetic may be used to numb the area. A needle is inserted through the skin and into the fat pad under the skin. A small core of the fat pad is removed with the needle and sent to the laboratory for analysis.
How to prepare for the test
No special preparation is usually necessary.
How the test will feel
Although your health care provider may have numbed the skin, there can be some mild discomfort or pressure during the needle insertion. Afterward, the area may feel tender or bruised for several days.
Why the test is performed
This test may be performed when amyloidosis is suspected.
The fat pad tissues are normal.
What abnormal results mean
In the case of amyloidosis, abnormal results mean there is amyloid, a protein that deposits in tissues and impairs organ and tissue function.
What the risks are
The risks are minimal. There is a slight risk of infection. There is also a minor risk of bruising or slight bleeding.
Gertz MA, Lacy MO, Dispenzieri A, Hayman SR. Immunoglobulin light-chain amyloidosis (primary amyloidosis). In: Hoffman R, Benz EJ Jr., Shattil SJ, et al, eds. Hoffman Hematology: Basic Principles and Practice. 5th ed. Philadelphia, Pa: Churchill Livingstone Elsevier;2008:chap 89.
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.