KIT (v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog) (eg, mastocytosis), gene analysis, D816 variant(s)
CPT4 code
Name of the Procedure:
KIT (v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog), gene analysis, D816 variant(s)
Common name(s): KIT gene analysis, Mastocytosis KIT D816V variant test
Summary
The KIT gene analysis procedure examines genetic mutations, specifically the D816 variant, in the KIT gene. Often associated with conditions like mastocytosis, this test helps doctors identify and tailor treatments based on genetic findings.
Purpose
The procedure primarily addresses mastocytosis and other conditions involving abnormal cell growth. By identifying specific genetic variants in the KIT gene, physicians can better understand the disease and develop targeted treatment plans.
Indications
- Suspicion of mastocytosis due to symptoms like skin lesions, itching, or anaphylaxis.
- Unexplained elevated tryptase levels.
- Diagnosis confirmation or exclusion in patients showing mast cell proliferation.
- Patients with a family history of similar genetic mutations or related symptoms.
Preparation
- Fasting is generally not required.
- Inform the doctor about all medications taken.
- Blood sample collection typically does not require special preparation.
- Pre-procedure consultation to discuss medical history.
Procedure Description
- Blood Sample Collection: A healthcare professional will draw blood from a vein, usually from the arm.
- Laboratory Analysis: The collected blood is sent to a specialized lab where DNA is extracted.
- Genetic Testing: The lab uses advanced genetic techniques, such as PCR (Polymerase Chain Reaction), to examine the KIT gene for the D816 variant.
- Results Interpretation: Results are analyzed to identify the presence or absence of the D816 variant, which are then reported to the physician.
Duration
The blood sample collection takes about 5–10 minutes. Laboratory analysis usually takes a few days to a week, depending on the lab's workflow.
Setting
The blood sample is typically collected in a healthcare setting such as a hospital, outpatient clinic, or diagnostic laboratory.
Personnel
- Phlebotomist or nurse for blood sample collection.
- Geneticist or specialized laboratory technician for sample analysis.
- Physician or specialist for result interpretation and consultation.
Risks and Complications
- Common Risks: Minor discomfort or bruising at the blood draw site.
- Rare Risks: Infection at the puncture site, light-headedness, or fainting.
Benefits
- Provides precise genetic information that aids in diagnosis and targeted therapy.
- Helps in planning personalized treatment plans.
- May provide peace of mind by confirming or ruling out specific conditions.
Recovery
- Minimal recovery needed from the blood draw.
- Follow any specific instructions given by the healthcare provider.
- No significant downtime or restrictions.
Alternatives
- Skin Biopsy: For confirming mastocytosis through histological analysis.
- Bone Marrow Biopsy: Used in extensive analysis beyond what genetic testing offers.
General Blood Tests: Assess mast cell-related markers but lack genetic specificity.
Pros of KIT Gene Analysis: Non-invasive, highly specific. Cons: May not detect other unrelated genetic or histological abnormalities.
Patient Experience
- During Procedure: Mild discomfort from the needle during blood draw.
- After Procedure: Generally no significant pain; slight bruising may occur.
- Pain management and comfort measures: Usually not necessary, but a warm compress can ease minor discomfort or bruising post-blood draw.