Ferritin and TSAT ranges reported by studies that evaluated BM iron in patients with CICs. Data include patients with HF, dialytic CKD or ndCKD, HIV infection, IBDs,³⁶  and data from a systematic review of 38 studies in nonhealthy patients, including blood disorders, liver conditions, rheumatoid arthritis, among others.¹⁹  The area in red represents the thresholds for absolute ID recommended by WHO (ferritin >30 μg/L and TSAT >16%). Patients with BMID have ferritin <160 μg/L and TSAT <20%. TSAT 20% to 25% is still associated with BMID in CKD, and TSAT <20% may still predict BMID in patients with ferritin up to 500 μg/L with HF or CKD treated with ESAs, with or without hemodialysis. Studies that reported only ferritin levels are represented by red lines beneath the x-axis that encompass the range, and means are represented by diamonds situated on the lines.