When an MPN is suspected, blood tests are conducted that count the number of different cells in the blood. If the results are abnormal, other blood tests may be ordered.
A bone marrow biopsy is performed to confirm a diagnosis of MPN. During this test, a needle is inserted into the bone and marrow is extracted. The sample is then carefully examined under a microscope by a pathologist.
UCSF Health medical specialists have reviewed this information. It is for educational purposes only and is not intended to replace the advice of your doctor or other health care provider. We encourage you to discuss any questions or concerns you may have with your provider.