Background/Aims: Access blood flow (Qa) measurements are recommended by the current guidelines as one of the most important components in vascular access maintenance programs. This study evaluates the efficiency of Qa measurement with on-line conductivity (OLC-Qa) and blood temperature monitoring (BTM-Qa) in comparison with the gold standard saline dilution method (SDM-Qa). Subjects and Methods: 50 long-term hemodialysis patients (42 arteriovenous fistulas/8 arteriovenous grafts) were studied. Bland-Altman and Lin’s coefficient (ρ_c) were used to study accuracy and precision. Results: Mean values were 1,021.7 ± 502.4 ml/min SDM-Qa, 832.8 ± 574.3 ml/min OLC-Qa (p = 0.007) and 1,094.9 ± 491.9 ml/min with BTM-Qa (p = NS). Biases and ρ_c obtained were –188.8 ml/min (ρ_c 0.58) OLC-Qa and 73.2 ml/min (ρ_c 0.89) BTM-Qa. The limits of agreement (bias ± 1.96 SD) obtained were from –1,119 to 741.3 ml/min (OLC-Qa) and –350.6 to 497.2 ml/min (BTM-Qa). Conclusions: BTM-Qa and OLC-Qa are valid noninvasive and practical methods to estimate Qa, although BTM-Qa was more accurate and had better concordance than OLC-Qa compared with SDM-Qa.

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