CDN Fluid and Electrolyte Balance in Dialysis

Question 1

Which parameter is used to determine the ultrafiltration volume goal for a hemodialysis patient?

Accepted Answer

Difference between current weight and estimated dry weight

Answer

Ultrafiltration volume is calculated as the difference between the patient's current (wet) weight and their estimated dry weight (ideal fluid-free weight).

Question 2

A dialysis patient's predialysis serum potassium is 6.8 mEq/L. Which dialysate potassium concentration is most appropriate?

Accepted Answer

2.0 mEq/L

Answer

A 2.0 mEq/L dialysate potassium provides adequate gradient to remove excess potassium while reducing the risk of arrhythmia from overly rapid shifts.

Question 3

What is the normal serum phosphorus target range for dialysis patients per KDIGO guidelines?

Accepted Answer

2.5–4.5 mg/dL

Answer

KDIGO guidelines recommend lowering elevated serum phosphorus toward the normal range of approximately 2.5–4.5 mg/dL in dialysis patients.

Question 4

Which fluid restriction guideline is commonly recommended for anuric hemodialysis patients?

Accepted Answer

Urine output plus 500–750 mL/day

Answer

Non-anuric patients are restricted to their urine output plus 500–750 mL/day to account for insensible losses while preventing interdialytic fluid overload.

Question 5

Hypermagnesemia in dialysis patients most commonly results from which of the following?

Accepted Answer

Regular use of magnesium-containing antacids or laxatives

Answer

Dialysis patients who use magnesium-containing antacids or laxatives are at risk for hypermagnesemia because the kidneys cannot excrete excess magnesium.

CDN - Certified Dialysis Nurse Practice Test

CDN - Certified Dialysis Nurse Practice Test

CDN Fluid and Electrolyte Balance in Dialysis