<prompt> Which of the following is not a seronegative spondyloardthropathy?Psoriatic ahritisankylosing spondylitisRAReiters ahritis  <response>: Seronegative spondyloahropathies SpA are a family of rheumatologic disorders that classically include: Ankylosing spondylitis AS Psoriatic ahritis PsA Inflammatory bowel disease IBD associated ahritis.Seronegative spondyloahropathies seronegative spondyloahritides share ceain clinical characteristics eg, back pain, uveitis, GI symptoms, rashes. Some are strongly associated with the HLA-B27 allele. Rheumatoid factor RF is usually negative in the spondyloahropathies hence, why they are called seronegative spondyloahropathies 