A member asked:

I tested positive for a jak2 mutation on a blood test and when my marrow was tested the jak2 mutation was not found. how can this be?

A doctor has provided 1 answer

Dr. Matthew Fero answered

Specializes in Medical Oncology

Borderline result?: You are correct to wonder how a genetic test that is positive in blood can be negative in marrow, because a marrow aspirate is around 50% blood. If a blood test was borderline to begin with (due to a low percentage of positive cells), or if it was a false positive, then it may turn up negative in the marrow.

Dr Ali and another doctor agreed

Answered 9/25/2019

2.9k views

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A member asked:

I tested positive for a jak2 mutation on a blood test and when my marrow was tested the jak2 mutation was not found. how can this be?

A doctor has provided 1 answer

Dr. Matthew Fero answered

Dr Ali and another doctor agreed

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