Test Catalog

Test ID: PVJAK    
Polycythemia Vera, JAK2 V617F with Reflex to JAK2 Exon 12-15, Sequencing for Erythrocytosis, Varies

Useful For Suggests clinical disorders or settings where the test may be helpful

Aiding in the distinction between the myeloproliferative neoplasm polycythemia vera (PV) and other secondary erythrocytosis

Reflex Tests Lists tests that may or may not be performed, at an additional charge, depending on the result and interpretation of the initial tests.

Test IDReporting NameAvailable SeparatelyAlways Performed
JAKXRJAK2 Exon 12-15 Sequencing, ReflexYes, (order JAKXB-blood or JAKXM-bone marrow), Bill OnlyNo

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

Both DNA and RNA are extracted. The algorithm starts with a highly sensitive DNA-based JAK2 V617F test by allele specific polymerase chain reaction. If the JAK2 V617F result is negative or very low positive (0.06%-0.6%), JAK2 exon 12-15 Sanger sequencing test will be performed on the stored RNA sample. If a JAK2 V617F mutation (>0.6%) is detected, the algorithm stops and no further testing will be performed.


The Sanger sequencing covers JAK2 exons 12 through the first 90% of exon 15, which spans the region containing essentially all mutations reported in myeloproliferative neoplasms. The following algorithms are available in Special Instructions.

-Erythrocytosis Evaluation Testing Algorithm

-Myeloproliferative Neoplasm: A Diagnostic Approach to Bone Marrow Evaluation

-Myeloproliferative Neoplasm: A Diagnostic Approach to Peripheral Blood Evaluation

Special Instructions Library of PDFs including pertinent information and forms related to the test

Method Name A short description of the method used to perform the test

Allele-Specific Polymerase Chain Reaction (AS-PCR) and Sanger Sequencing

NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

PV (JAK2 V617F, Exon 12-15) Reflex

Aliases Lists additional common names for a test, as an aid in searching

JAK2 V617F
JAK2 exon 12
Polycythemia Vera
Myeloproliferative Neoplasm (MPN)