True or False? The sample for conductivity testing is obtained from the arterial/red dialysate line.

True or False? The sample for conductivity testing is obtained from the arterial/red dialysate line.

• A. True
• B. False
• C. Not applicable
• D. Only during certain machines

Answer: (B)

Conductivity testing checks the ionic strength of the dialysate, not the patient’s blood. The sample must come from the dialysate circuit so the reading reflects the bath composition that will contact the blood across the dialyzer membrane. Sampling from the arterial blood line would give you information about the patient’s blood, not the dialysate, and would not indicate dialysate quality. Because the dialysate’s conductance determines how electrolytes diffuse across the membrane, accurate conductivity is essential for safe and effective dialysis. Therefore, the statement is false—the sample for conductivity testing does not come from the arterial/red dialysate line.

Conductivity testing checks the ionic strength of the dialysate, not the patient’s blood. The sample must come from the dialysate circuit so the reading reflects the bath composition that will contact the blood across the dialyzer membrane. Sampling from the arterial blood line would give you information about the patient’s blood, not the dialysate, and would not indicate dialysate quality. Because the dialysate’s conductance determines how electrolytes diffuse across the membrane, accurate conductivity is essential for safe and effective dialysis. Therefore, the statement is false—the sample for conductivity testing does not come from the arterial/red dialysate line.