Test Overview
Test Methodology

Multiplex Polymerase Chain Reaction (PCR) with Capillary Electrophoresis

Test Usage

MPL gene mutations occur in cases of primary myelofibrosis (PMF) and essential thrombocythemia (ET) at a frequency of ~10% and 3% respectively. Testing for MPL mutations may aid in the diagnosis of these myeloproliferative neoplasms. MPL mutations are usually found in cases that test negative for the JAK2 V617F mutation, although a small number of patients have been reported with both mutations. This test will qualitatively detect MPL mutations (W515L, W515K, W515A, and S505N) in peripheral blood or bone marrow with a sensitivity down to 5% mutant allele.

Reference Range *

Interpretive report provided.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

The limit of detection of this assay is 10% mutation-bearing cells. Mutations may not be detected in samples with a neoplastic burden below this level. Rare mutations other than W515L, W515K, W515A or S505N (accounting for less than 2% of described MPL mutations) will not be detected.

Test Details
Days Set Up
Monday - Friday
Analytic Time

2 - 7 days

Soft Order Code
MPLMD
MiChart Code
MPL Mutation
Synonyms
  • MLABEL
  • W515A Mutation
  • W515K Mutation
  • W515L Mutation
  • MPL Mutation Detection
  • MPLMUT
  • S505N Mutation
  • MPLMD
Laboratory
Molecular Diagnostics
Section
Molecular Diagnostics
Specimen Requirements
Collection Instructions

Collect blood or bone marrow in a lavender top tube. Refrigerate and send intact blood or bone marrow specimen within 48 hours of collection. Fresh cell suspensions in RPMI should be refrigerated and sent, preferably within 48 hours. Frozen cell suspensions – preferably frozen with 1 hour of collection – may also be sent frozen on dry ice.

Alternate Specimen
The preferred specimen is whole blood or bone marrow collected in EDTA (lavender top). However, ACD (yellow top) and heparin (green top) may also be accepted. Previously extracted DNA may also be accepted.
Normal Volume
5 mL EDTA (lavender) whole blood; 3 mL EDTA (lavender) bone marrow; Fresh/frozen cells in RPMI. Extracted DNA is also acceptable if extracted in a CLIA certified laboratory.
Additional Information

By ordering this test the clinician acknowledges that informed consent has been obtained from the patient as required by applicable state or federal laws and the ordering clinician has authorization from the patient permitting MLabs to report the test results to the ordering clinician. Test includes pathologist interpretation of results billed as a separate additional charge. This test is not available without interpretation.

Billing
CPT Code
81338
Fee Code
NA112
Pro Fee CPT
G0452-26
Prior Authorization
The Prior Authorization form is required for this test. Click here to download the PDF.
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