HLA Class I and II typing, low resolution (eg, antigen equivalents); HLA-A, -B, -C, -DRB1/3/4/5, and -DQB1
CPT4 code
Name of the Procedure:
HLA Class I and II Typing, Low Resolution (Antigen Equivalents); HLA-A, -B, -C, -DRB1/3/4/5, and -DQB1
Summary
Human Leukocyte Antigen (HLA) Class I and II Typing is a laboratory test that identifies specific proteins (antigens) on the surface of cells. This low-resolution test determines the HLA types for the genes HLA-A, -B, -C, -DRB1, -DRB3, -DRB4, -DRB5, and -DQB1, which are crucial for the immune system's ability to differentiate between self and non-self.
Purpose
The procedure is primarily used for matching donors and recipients for organ, tissue, and bone marrow transplants to minimize the risk of rejection. It also assists in diagnosing certain autoimmune diseases and in researching genetic predispositions to various conditions.
Indications
- Patients awaiting organ or tissue transplants.
- Individuals preparing to donate organs, tissues, or bone marrow.
- Patients with conditions involving the immune system, such as autoimmune diseases.
- Research participants in genetic or immunological studies.
Preparation
- No special preparation is typically required for the patient.
- Blood sample collection may necessitate standard blood draw preparations, like ensuring hydration.
- Consult with healthcare providers regarding ongoing medications or conditions.
Procedure Description
- Sample Collection: Blood is drawn from the patient, usually from a vein in the arm.
- Laboratory Analysis:
- The blood sample is sent to a specialized laboratory.
- DNA is extracted from the blood cells.
- Polymerase Chain Reaction (PCR) and sequence-specific oligonucleotide (SSO) probing are utilized to determine HLA types.
- Result Interpretation: Results are typically reported in low-resolution, identifying broad HLA antigen categories.
Duration
- Blood draw: Approximately 10 minutes.
- Laboratory analysis: Varies from a few days to a week, depending on the laboratory's processing time.
Setting
The blood draw is performed in a clinical setting such as a hospital, outpatient clinic, or specialized laboratory.
Personnel
- Phlebotomist or nurse for blood draw.
- Laboratory technicians and specialists for blood analysis.
- Healthcare provider for interpreting results and providing guidance.
Risks and Complications
- Common risks: Minor discomfort or bruising at the blood draw site.
- Rare risks: Infection, excessive bleeding, or fainting during blood draw.
- Complications are minimal and typically managed with standard medical care.
Benefits
- Identification of compatible donors or recipients for transplantation, significantly increasing the success rate.
- Early diagnosis and management of autoimmune diseases.
- Valuable data for genetic and immunological research.
Recovery
- Post-procedure: Typically, no recovery time is required; patients can resume normal activities immediately.
- Follow-up: Depends on the reason for testing and the results obtained. Further consultations may be needed for transplant planning or medical management.
Alternatives
- High-resolution HLA typing: More detailed, but more time-consuming and expensive.
- Serological HLA typing: Less common and typically less precise.
- Alternative genetic tests: Depending on the specific indication, other genetic or immunological tests may be considered.
Patient Experience
- During the procedure: Mild discomfort during blood draw; otherwise, non-invasive.
- After the procedure: Generally no side effects; minor soreness at the puncture site may occur.
- Pain management: Typically not necessary, as the procedure is minimally invasive and low risk.
This information provides a thorough understanding of the procedure, HLA Class I and II Typing at low resolution, ensuring patients and healthcare providers are well-informed.