Laboratory Evaluation of Dialysis Patients

Core Monthly Laboratory Tests

• The American Journal of Kidney Diseases recommends measuring Kt/V or urea reduction ratio (URR) monthly to ensure adequate solute clearance, with target Kt/V ≥1.2 for hemodialysis patients 1
• Obtain predialysis and postdialysis blood urea nitrogen (BUN) samples to calculate these parameters, as recommended by the American Journal of Kidney Diseases 1
• For hemodialysis patients, draw blood samples before the midweek dialysis session to minimize variability, according to Kidney International Supplements 2
• The American Journal of Kidney Diseases suggests measuring hemoglobin (Hgb) monthly using predialysis samples, rather than hematocrit, as Hgb is more stable and accurate 3
• Initiate anemia workup when Hgb falls below 11 g/dL in premenopausal females/prepubertal patients or below 12 g/dL in adult males/postmenopausal females, as recommended by the American Journal of Kidney Diseases 3
• Check serum ferritin and transferrin saturation monthly to guide iron therapy, according to Kidney International Supplements and the American Journal of Kidney Diseases 2, 3
• Target transferrin saturation ≥20% and serum ferritin >100 ng/mL to ensure adequate iron availability for erythropoiesis, as suggested by Kidney International Supplements 2
• Measure sodium, potassium, calcium, phosphorus, magnesium, and bicarbonate monthly, as recommended by the American Journal of Kidney Diseases 4
• Check magnesium levels routinely, as hypomagnesemia occurs in 60-65% of dialysis patients and causes refractory hypokalemia/hypocalcemia, according to Praxis Medical Insights 6

Quarterly Laboratory Tests

• Measure serum albumin every 3 months as a marker of nutritional status and predictor of mortality, as recommended by the American Journal of Kidney Diseases 1

Baseline and Periodic Cardiac Evaluation

• Obtain baseline electrocardiogram (ECG) and echocardiogram within 1-3 months after achieving dry weight, as suggested by the American Journal of Kidney Diseases 4, 7, 8
• Perform annual ECGs after dialysis initiation, according to the American Journal of Kidney Diseases 4, 7, 9
• Repeat echocardiography every 3 years or when clinical status changes, as recommended by the American Journal of Kidney Diseases 8

Special Circumstances

• Establish baseline peritoneal membrane transport characteristics 4-8 weeks after starting daily peritoneal dialysis, as suggested by the American Journal of Kidney Diseases 10
• Patients on the transplant waitlist require additional cardiovascular screening with stress imaging at intervals determined by diabetes status and cardiac risk factors, according to the American Journal of Kidney Diseases 4, 7, 9