Davis's Lab & Diagnostic TestsSearch Davis's Lab & Diagnostic TestsABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZJAK2 V617F mutationJaundiceJoint changes, degenerativeJoint derangement, arthrogram ofJoint dislocation, bone x-rays inJointsJoint tumors, synovial fluid analysis ofJuvenile idiopathic arthritis, rheumatoid factor inJuvenile rheumatoid arthritis, human leukocyte antigen B27