Etanercept determination kit  is an in vitro diagnostic test for the quantitative detection of free etanercept in human serum or plasma specimen.

Etanercept is a medication used to manage and treat autoimmune conditions such as plaque psoriasis, rheumatoid arthritis, psoriatic arthritis, juvenile idiopathic arthritis, and ankylosing spondylitis. It is a biologic fusion protein in the TNF blocker class of medications. Monitoring etanercept drug levels may be very helpful in optimizing therapy.