Protein analysis of tissue by Western Blot, with interpretation and report
CPT4 code
Name of the Procedure:
Protein Analysis of Tissue by Western Blot (Western Blotting, Immunoblotting)
Summary
Western blotting is a laboratory technique used to detect specific proteins in a tissue sample. The process involves separating proteins by size, transferring them to a membrane, and then visualizing them using antibodies. The results help in diagnosing various conditions and understanding protein function.
Purpose
The procedure is used to diagnose diseases that affect protein expression, such as certain types of cancers, neurodegenerative diseases, and infections. It can also be used in research to study protein behavior and interactions.
Indications
- Symptoms or clinical suspicion of diseases affecting protein expression
- Abnormal results from other diagnostic tests suggesting a protein-related disorder
- Research objectives requiring detailed protein analysis
Preparation
- No specific patient preparation is needed as the tissue sample is typically obtained from a biopsy or surgery.
- Ensure that the tissue sample is fresh or properly preserved.
Procedure Description
- Tissue Sample Preparation: The tissue is homogenized and prepared for protein extraction.
- Protein Extraction: Proteins are extracted from the tissue sample using a lysis buffer.
- Gel Electrophoresis: The extracted proteins are loaded onto a gel and subjected to an electric current, separating them by size.
- Transfer: The separated proteins are transferred from the gel to a membrane.
- Blocking: The membrane is treated with a blocking buffer to prevent non-specific binding.
- Antibody Incubation: The membrane is incubated with primary antibodies specific to the target protein, followed by secondary antibodies that are linked to a detection system.
- Detection: The bound antibodies are visualized using methods like chemiluminescence, allowing for identification and quantification of the protein.
Duration
The entire procedure typically takes about 6 to 8 hours from start to finish.
Setting
The procedure is performed in a laboratory setting.
Personnel
- Medical laboratory technicians
- Research scientists
- Pathologists
Risks and Complications
- No direct risks to the patient as the procedure is performed on tissue samples.
- Potential for sample degradation if not handled properly.
Benefits
- Provides specific and detailed information about protein expression and function.
- Aids in accurate diagnosis and understanding of various medical conditions.
Recovery
- No recovery required for the patient since it is a laboratory-based procedure.
- Follow-up depends on the findings and the recommendations of the healthcare provider based on the results.
Alternatives
- Enzyme-linked immunosorbent assay (ELISA): Less detailed but faster and simpler.
- Mass spectrometry: More detailed and comprehensive but more complex and expensive.
Patient Experience
Since the Western Blot procedure is conducted on a tissue sample in a lab, the patient does not experience anything directly related to the procedure itself.