Assess hemodialysis adequacy with the Daugirdas formula.
spKt/V = −ln(R − 0.008×t) + (4 − 3.5×R) × UF/W, where R = post-BUN/pre-BUN, t = session duration in hours, UF = ultrafiltration volume in kg, W = post-dialysis weight. KDOQI recommends a minimum spKt/V of 1.2 per session (target 1.4). URR ≥ 65% is an alternative adequacy measure.