Fig. 2From: Fibroblast growth factor 21 (FGF21) is a sensitive marker of osteoporosis in haemodialysis patients: a cross-sectional observational studyAxial image through the vertebral body of L1 on a thoracoabdominal-pelvic CT scan. Placement of the region of interest within the trabecular bone and assessment of the CT attenuation value in Hounsfield units (182.3 HU left and 96.5 HU right in this example)Back to article page