HBB (hemoglobin, subunit beta) (eg, sickle cell anemia, beta thalassemia, hemoglobinopathy); full gene sequence
CPT4 code
Name of the Procedure:
Hemoglobin, Subunit Beta (HBB) Full Gene Sequencing
Summary
Hemoglobin, subunit beta (HBB) full gene sequencing is a genetic test used to analyze the entire sequence of the HBB gene. This test helps diagnose blood disorders, such as sickle cell anemia, beta thalassemia, and other hemoglobinopathies by identifying mutations in the HBB gene.
Purpose
The primary purpose of HBB full gene sequencing is to diagnose genetic blood disorders and provide critical information for treatment planning. By detecting the specific mutations in the HBB gene, healthcare providers can better understand the nature of the hemoglobin disorder and offer appropriate medical interventions.
Indications
HBB full gene sequencing is indicated for patients who exhibit:
- Symptoms of sickle cell anemia (e.g., pain crises, anemia, jaundice).
- Signs of beta thalassemia (e.g., severe anemia, growth issues).
- A family history of hemoglobinopathies.
- Unexplained chronic anemia or other related hematological conditions.
Preparation
- No special preparation such as fasting is typically required.
- Patients might need to provide a detailed family medical history.
- A blood sample is usually taken, and no additional tests or assessments are required prior to the procedure.
Procedure Description
- A blood sample is collected from the patient using a standard venipuncture technique.
- DNA is extracted from the collected blood sample.
- The extracted DNA undergoes sequencing to cover the full length of the HBB gene.
- Advanced bioinformatics tools analyze the sequence to identify any mutations or abnormalities.
- The results are interpreted by a geneticist and shared with the patient's healthcare provider for further action.
Duration
The blood sample collection takes a few minutes, while the gene sequencing and analysis process may take several days to a few weeks.
Setting
The blood sample is typically collected in an outpatient clinic or hospital setting. The actual sequencing is done in a specialized laboratory.
Personnel
- Phlebotomist or nurse for blood sample collection.
- Lab technicians and geneticists for DNA extraction, sequencing, and analysis.
- Healthcare provider for discussing results and management plans with the patient.
Risks and Complications
- Minor risks associated with blood sample collection, such as bruising or infection at the puncture site.
- Genetic testing may reveal unexpected findings, necessitating further counseling.
Benefits
- Accurate diagnosis of genetic blood disorders.
- Personalized treatment plans based on the specific genetic mutation.
- Potential for early intervention and better management of symptoms.
Recovery
- No specific recovery needed from the blood collection itself.
- Patients may need to engage in follow-up appointments to discuss results and plan further treatment or management based on findings.
Alternatives
Alternative tests may include:
- Hemoglobin electrophoresis.
- High-Performance Liquid Chromatography (HPLC) for hemoglobin variants. While these tests may identify abnormal hemoglobin types, they do not provide detailed genetic mutation information like full gene sequencing.
Patient Experience
During the blood draw, patients might feel a brief pinch or discomfort. Post-procedure, there might be minor bruising at the puncture site. Most patients can resume normal activities immediately after providing the blood sample. If genetic mutations are detected, genetic counseling is often recommended to understand and navigate the possible implications.