Immunophenotyping by Flow Cytometry TdT Test
Short Name: TdT Flow Cytometry
Also known as: TdT Immunophenotyping, Terminal Deoxynucleotidyl Transferase Flow Cytometry, TdT Flow Cytometry Assay
Immunophenotyping by Flow Cytometry TdT Test test available at DNA Labs India for ₹3,500. Uses Flow Cytometry on Whole blood or bone marrow samples. Results in Sample received by 9 am; report same day.. Free home collection in 300+ cities across India.
🩺 Medically Reviewed By
Dr Pasupathy Arumugam
Consultant Pathologist · Reg: 21521
Last reviewed: September 7, 2026
Overview
The test is primarily used to diagnose and monitor blood cancers such as leukemia and lymphoma by determining the type of cells present in a blood or bone marrow sample.
- Test Code
- 3499
- Price
- ₹3,500
- Sample Type
- Whole blood or bone marrow
- Result Time
- Sample received by 9 am; report same day.
- Fasting Required
- No
- Method
- Flow Cytometry
Sample Collection
Share brief clinical history with the laboratory; no fasting required.
Method: Venipuncture or bone marrow aspiration
Laboratory Analysis
A trained phlebotomist collects venous blood in EDTA and sodium heparin tubes. Bone marrow aspiration is performed by a clinician using standard sterile precautions.
Report Delivery
Maintain sample at room temperature (18-22°C). Do not refrigerate or freeze. Transport to the laboratory immediately with the completed requisition form.
Timeline: Sample received by 9 am; report same day.
Patient Instructions
About This Test
Who Should Get This Test
The test is primarily used to diagnose and monitor blood cancers such as leukemia and lymphoma by determining the type of cells present in a blood or bone marrow sample.
How to Prepare
- Collect 3 mL whole blood in Lavender Top EDTA tube and 3 mL whole blood in Green Top sodium heparin tube
- Alternatively, collect 2 mL bone marrow in a Green Top sodium heparin tube
- Specify time, date, and clinical details on the test request form
- Ship immediately at 18-22°C; do not refrigerate or freeze
Doctor's Notes
Reviewed by Dr Pasupathy Arumugam — MBBS, MD (Pathology) · Reg. No. 21521
"TdT expression is a critical marker for immature lymphoid cells. A positive TdT result should always be interpreted within the full immunophenotypic, morphological, cytogenetic, and molecular context to guide accurate diagnosis and therapy."
Last medically reviewed: September 7, 2026
Test Parameters & Specifications
Sample Stability
- Refrigerated or frozen samples
- Clotted samples
- Insufficient sample volume
- Unlabeled or mismatched samples
- Samples delayed beyond stability limits
Understanding Your Results
Consult your oncologist or hematologist if you have unexplained fever, fatigue, weight loss, night sweats, swollen lymph nodes, easy bruising, or abnormal blood counts.
Limitations
- ⚠Does not replace morphological, cytogenetic, and molecular evaluation
- ⚠TdT may be expressed in normal hematogones in bone marrow, requiring careful gating
- ⚠A negative result does not rule out all hematological malignancies
Risks & Considerations
- ●Mild pain or bruising at venipuncture site
- ●Rare bleeding or infection at bone marrow aspiration site
Interfering Factors
- ●Refrigerated or frozen samples may reduce cell viability and marker expression
- ●Delayed transport beyond room temperature stability limits
- ●Clotted or hemolyzed samples
- ●Recent chemotherapy may reduce blast counts
- ●Poor sample viability can affect gating and interpretation
Compare With Similar Tests
| Test | Immunophenotyping by Flow Cytometry TdT Test | |||
|---|---|---|---|---|
| Comparison | Immunophenotyping by Flow Cytometry TdT Test |
Frequently Asked Questions
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