Last Modified:
6/16/2022 7:53:24 AM
Medical Necessity Documentation:
Client Notes:
Patient Preparation:
Specimen Requirements:
5.0 mL Whole Blood in a Lavender Top Tube - EDTA
Collection Instructions:
Minimum Volume:
0.3 mL Whole Blood
Transport & Storage: Temperature/Stability:
7 days Ambient
7 days Refrigerated (transport)
Rejection Criteria:
Frozen; Clotted; Gross Hemolysis; Do not reject, send to lab for evaluation.
Reference Range:
FLT3 ITD: Not detected
FLT3 TKD: Not detected
Critical Ranges:
Test Comments:
Methodology:
Polymerase Chain Reaction (PCR)
Clinical Significance:
FLT3 (fms-like tyrosine kinase-3) is a receptor tyrosine kinase that plays a significant role in cell survival, proliferation, and differentiation of hematopoietic stem cells. Mutations of FLT3 represent one of the most frequent molecular mutations in acute myeloid leukemia (AML) and are reported in 25-30% of the patients. These mutations predominantly include FLT3 internal tandem duplications (ITD) which occur in the region of the gene encoding the juxtamembrane region of the protein and point mutations in the tyrosine kinase domain (TKD). The TKD mutations most frequently involve mutation or deletion of codons D835 or I836. Both ITD and TKD mutations constitutively activate FLT3 kinase activity without the need for the ligand and hence promote malignancy. AML patients with FLT3 internal tandem duplication (ITD) mutations have poor prognosis, high relapse rates, and reduced overall survival. Patients with FLT3 mutations could be eligible for FLT3-targeted therapy regimens.
Documentation:
Custom Panel:
No
PRODUCTION SCHEDULE
Turn Around Time:
3 to 4 days
Days Performed:
Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
Sites Performed:
Quest - Chantilly
PHL Test Code:
FLT3B
Send Out Test Code:
39786
Alternate Test Names:
Acute Myeloid Leukemia; AML; fms-like tyrosine kinase 3; ITD; TKD
Included Tests:
CPT Coding:
81245, 81246
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