TRB@ (T cell antigen receptor, beta) (eg, leukemia and lymphoma), gene rearrangement analysis to detect abnormal clonal population(s); using amplification methodology (eg, polymerase chain reaction)
CPT4 code
Name of the Procedure:
T cell antigen receptor, beta (TRB@) gene rearrangement analysis using amplification methodology, such as polymerase chain reaction (PCR).
Summary
This procedure involves analyzing the genetic rearrangements in the beta chain of T cell antigen receptors to detect abnormal clonal populations, primarily used in diagnosing leukemia and lymphoma.
Purpose
The primary aim is to identify abnormal clonal populations of T cells, which are indicative of certain types of leukemia and lymphoma. By detecting these clonal populations, the procedure helps diagnose and guide the treatment of these cancers.
Indications
- Presence of symptoms suggesting leukemia or lymphoma (e.g., unexplained weight loss, swollen lymph nodes, frequent infections).
- Abnormal results from preliminary blood tests or imaging studies.
- Need to confirm a diagnosis of T-cell related cancers.
Preparation
- No special fasting or medication adjustments are typically required.
- Blood samples or tissue biopsies may be necessary, so patients might undergo local anesthesia if a biopsy is needed.
- Inform the doctor of any medications, allergies, or underlying health conditions.
Procedure Description
- Sample Collection: Blood or tissue samples are collected from the patient. If a tissue biopsy is needed, local anesthesia is applied to numb the area.
- DNA Extraction: DNA is extracted from the collected sample.
- Amplification: Using polymerase chain reaction (PCR), the specific regions of the DNA that code for the T cell receptor beta chain are amplified.
- Analysis: The amplified DNA is then analyzed to detect any abnormal clonal populations, indicative of certain cancers.
Duration
The entire process, from sample collection to analysis, typically takes approximately 1-2 days, although the analysis itself may only take a few hours.
Setting
This procedure is usually performed in a laboratory setting, often within a specialized molecular pathology lab.
Personnel
- Pathologists
- Laboratory Technicians
- Molecular Biologists
- Oncologists may be involved in the interpretation of the results.
Risks and Complications
- Common: There are minimal risks associated with the blood draw or biopsy, such as slight bruising or soreness.
- Rare: Infection or significant bleeding at the biopsy site, though these are uncommon.
Benefits
- Accurate detection of clonal T cell populations.
- Early and precise diagnosis of leukemia and lymphoma.
- Provides important information for the treatment planning.
Recovery
- Post-procedure care for biopsy may include keeping the site clean and dry.
- Recovery time from the sampling procedure is usually quick, with little to no downtime.
- Follow-up appointments may be scheduled to discuss the results and further treatment.
Alternatives
- Flow cytometry for cellular analysis.
- Imaging studies such as PET or CT scans.
- Biopsy with histopathological examination.
- Pros: The described procedure provides specific genetic information not available from other methods.
- Cons: Other methods may be less invasive but might not offer the same level of detail on clonal populations.
Patient Experience
- During the sample collection: Mild discomfort during blood draw or biopsy.
- After the procedure: Minimal pain or discomfort; usually managed with over-the-counter pain relievers.
- During analysis: The patient typically does not experience anything as this occurs in the lab.
- Results discussion: May involve a follow-up visit to the doctor to go over findings and next steps.