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. 2022 May 12;9(1):e000631. doi: 10.1136/lupus-2021-000631

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Renal activity index for lupus (RAIL) and RAIL standardised for urine creatinine (RAIL-Cr) scores above two correlate with high activity lupus nephritis (LN). Distribution of the RAIL and RAIL-Cr score (x-axis) represented by red and blue liner regression lines and 95% confidence limits, respectively, against the available range of National Institute of Health-activity index (NIH-AI) scores (y-axis) in 32 patients with active LN. Each NIH-AI score by RAIL (red circle) and RAIL-Cr scores (blue cross) is marked in the figure. The relationship between NIH-AI and two RAIL scores are presented in liner regression lines with 95% confidence limits (RAIL in red line and RAIL-Cr in blue line). Grey dash lines (NIH-AI=2 and 10) are reference cut points for inactive, low-moderate and high LN activity.