This variable is only available in MAP and MARS.
Interleukin-1 receptor agonist (IL-1RA) level is quantified from serum samples using highly sensitive multiplexed sandwich enzyme-linked immunosorbent assay (ELISA) arrays by Endogen Searchlight technologies (Billerica, MA). See the inflammatory markers subcategory description for more information.
The lower detection limit for MAP samples is 6.3 ng/mL.
This variable is expressed in ng/mL and is log transformed.
Notes: For MAP, values <6.3 ng/mL are coded to 6.0 ng/mL. For MARS, values <15.6 ng/mL are coded to 15.0 ng/mL.
Not recommended for combined analysis - use MAP only or MARS only