ALB and hydrops fetalis: In this cohort study, 1092 prevalent adult HD patients (mean age 61 years; 62% men; 42% had diabetes; 19% had cardiovascular disease) at Renal Care Services Colombia undergoing either HDx therapy enabled by Theranova dialyzer (n = 559) or HF‐HD (n = 533) were enrolled between September 1, 2017, and November 30, 2017, and then underwent repeated measurements of serum albumin for up to 48 months.