HBB (hemoglobin, subunit beta) (eg, sickle cell anemia, beta thalassemia, hemoglobinopathy); common variant(s) (eg, HbS, HbC, HbE)
CPT4 code
Name of the Procedure:
Hemoglobin, Subunit Beta (HBB) Genetic Testing (Common variants: HbS, HbC, HbE)
Summary
This genetic test analyzes the beta subunit of the hemoglobin protein to detect variants commonly associated with disorders like sickle cell anemia and various forms of thalassemia. By identifying specific mutations, healthcare providers can diagnose, manage, and provide genetic counseling for hemoglobinopathies.
Purpose
The HBB genetic test addresses hemoglobinopathies, conditions that affect the structure and function of hemoglobin. The goals are to diagnose inherited conditions such as sickle cell anemia, beta thalassemia, and other hemoglobin variants (HbS, HbC, HbE), and to guide treatment and family planning decisions.
Indications
- Symptoms such as chronic anemia, pain crises, or jaundice
- Family history of hemoglobin disorders
- Positive newborn screening results for hemoglobinopathies
- Couples planning pregnancy where both partners have a family history of hemoglobin disorders
Preparation
- No specific fasting or dietary restrictions are required.
- Typically, a blood sample is taken, so ensuring the patient is hydrated can be helpful.
- Informing your healthcare provider of all medications and supplements being taken is necessary.
Procedure Description
- A healthcare professional draws a blood sample from the patient.
- The blood sample is sent to a laboratory specializing in genetic testing.
- The laboratory performs DNA analysis on the beta subunit of the hemoglobin gene.
- Results are reviewed and interpreted by a genetic counselor or a specialist in hematology.
Duration
- Blood draw: approximately 5-10 minutes
- Laboratory analysis: typically 1-3 weeks
Setting
- Blood draw: typically performed in a doctor's office, hospital, or laboratory
- Genetic analysis: conducted in a specialized diagnostic laboratory
Personnel
- Phlebotomist or nurse for the blood draw
- Geneticist or laboratory technician for DNA analysis
- Genetic counselor or hematologist for interpreting results
Risks and Complications
- Minor bruising or discomfort at the blood draw site
- Psychological impact of learning about genetic mutations
Benefits
- Accurate diagnosis of conditions such as sickle cell anemia and beta thalassemia
- Informed decision-making regarding treatment and management
- Valuable information for family planning and genetic counseling
Recovery
- Minimal recovery time from the blood draw, typically just a few minutes
- Results discussion with a healthcare provider to understand implications and next steps
Alternatives
- Hemoglobin electrophoresis: another test that separates hemoglobin types
- Complete blood count (CBC): provides information about overall blood health but does not specifically detect hemoglobin variants
- Prenatal testing, such as amniocentesis, for detecting hemoglobinopathies in a fetus
Patient Experience
- During the blood draw, you may feel a slight prick or discomfort.
- Post-procedure, minor bruising may occur.
- Anxiety waiting for results is normal; support from genetic counselors can help manage this.
- Detailed explanation of results will guide you in understanding your health and any further actions needed.