-1739993209.png){kind=logo}
Home
HelpTest Code PMLR PML::RARA Quantitative, PCR, Varies
Testing Algorithm
For more information see Acute Promyelocytic Leukemia: Guideline to Diagnosis and Follow-up
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
VariesOrdering Guidance
This assay may not detect rare, unusual PML::RARA fusions. Therefore, if the assay is going to be used for monitoring after treatment, the test should be performed at the time of diagnosis to ensure that the test gives a positive result.
Shipping Instructions
1. Refrigerated specimens must arrive within 5 days of collection, and ambient specimens must arrive within 3 days of collection.
2. Collect and package specimen as close to shipping time as possible.
Necessary Information
The following information is required:
1. Pertinent clinical history
2. Date of collection
3. Specimen source (blood or bone marrow)
Specimen Required
Submit only 1 of the following specimens:
Specimen Type: Whole blood
Container/Tube:
Preferred: Lavender top (EDTA)
Acceptable: Yellow top (ACD)
Specimen Volume: 10 mL
Collection Instructions:
1. Invert several times to mix blood.
2. Send whole blood specimen in original tube. Do not aliquot.
3. Label specimen as blood.
Specimen Type: Bone marrow
Container/Tube:
Preferred: Lavender top (EDTA)
Acceptable: Yellow top (ACD)
Specimen Volume: 4 mL
Collection Instructions:
1. Invert several times to mix bone marrow.
2. Send bone marrow specimen in original tube. Do not aliquot
3. Label specimen as bone marrow.
Specimen Minimum Volume
Blood: 8 mL; Bone Marrow: 2 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Varies | Refrigerated (preferred) | 5 days | PURPLE OR PINK TOP/EDTA |
| Ambient | 72 hours | PURPLE OR PINK TOP/EDTA |
Reference Values
An interpretive report will be provided.
If positive, a value representing a ratio of PML::RARA fusion transcript to the control gene ABL1 expressed as a percentage will be reported.
Day(s) Performed
Monday through Saturday
CPT Code Information
81315-PML/RAR-alpha (t(15;17)), (PML-RARA regulated adaptor molecule 1) (eg, promyelocytic leukemia) translocation analysis; all breakpoints (eg, intron 3, intron 6 and variable in exon 6), qualitative or quantitative
Clinical Information
Acute promyelocytic leukemia (APL) accounts for 5% to 10% of acute myeloid leukemia and, generally, has a good prognosis with current treatment protocols. APL cells contain a fusion gene comprised of the downstream sequences of the retinoic acid receptor alpha gene (RARA) fused to the promoter region and upstream sequences of one of several genes, the most common (>80%) being the promyelocytic leukemia gene (PML). The fusion gene is designated PML::RARA and may be seen in a karyotype as t(15;17)(q22;q12). Messenger RNA produced from the fusion gene can be detected using a polymerase chain reaction (PCR)-based assay and indicates the presence of neoplastic cells. The PCR-based assay has greater sensitivity than standard methods such as morphology review, karyotyping, or fluorescence in situ hybridization.
Recent studies have indicated that sensitive monitoring is important because the majority of patients who remain PCR positive, or become PCR positive again following treatment, will relapse and will likely benefit from early intervention for residual/recurrent disease. This quantitative assay allows PML::RARA levels to be monitored rather than simply detecting the presence or absence of disease.
Report Available
4 to 8 daysReject Due To
| Gross hemolysis | Reject |
| Moderately to severely clotted | Reject |
Method Name
Quantitative, Real-Time Polymerase Chain Reaction (PCR)
Forms
1. Hematopathology Patient Information (T676)
2. If not ordering electronically, complete, print, and send a Hematopathology/Cytogenetics Test Request (T726) with the specimen.