10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free CCNT questions are organized by exam domain, so you can see how each part of the Certified in Clinical Nephrology Technology blueprint is tested. Reveal the answer and explanation under each question.
Inside a hollow-fiber dialyzer, blood and dialysate move in opposite directions. Blood urea concentration remains higher than dialysate urea concentration along the fiber. What best explains the continued urea removal?
Correct answer: C - Countercurrent flow preserves the gradient for blood-to-dialysate diffusion
A correctly collected pre-dialysis BUN is 76 mg/dL and the post-dialysis BUN is 24 mg/dL. Using URR = [(pre-BUN - post-BUN) / pre-BUN] × 100 and a threshold of at least 65%, how should this treatment be interpreted?
Correct answer: A - 68.4%; meets the 65% adequacy threshold
Four months of follow-up in an adult with diabetic kidney disease shows eGFR values of 38 and 36 mL/min/1.73 m² and a urine albumin-creatinine ratio of 460 mg/g. Which CGA description is correct?
Correct answer: B - Diabetic CKD G3b A3
At the pre-treatment assessment, an established AV fistula has no palpable thrill and no audible bruit. The patient reports no pain. The safest next step is to:
Correct answer: D - Avoid cannulation and notify the nurse immediately
For a 12-kg child, estimated total blood volume is 75 mL/kg. The planned extracorporeal circuit volume is 120 mL. Using 10% of total blood volume as the safety convention, this circuit represents:
Correct answer: A - 13.3%; obtain licensed-team review before connection
The prescription specifies dialysate potassium 2.0 mEq/L and calcium 2.5 mEq/L. The connected acid concentrate is labeled potassium 3.0 mEq/L and calcium 2.5 mEq/L, although machine conductivity and pH are normal. The technician should:
Correct answer: C - Keep the machine in bypass and verify the concentrate against the order
After the patient turns in the chair, venous pressure abruptly falls from 190 to 65 mm Hg while arterial pressure and blood-flow rate remain unchanged. The access is covered by a blanket. The priority is to:
Correct answer: D - Expose the access and inspect the venous needle and return line
The ordered net fluid removal is 3,600 mL over 3.5 hours, and the anticipated post-dialysis weight is 70 kg. Using UFR = UF volume / treatment hours / post-weight, which calculation and interpretation are accurate?
Correct answer: B - 14.7 mL/kg/hour; flag the prescription for licensed-team review
Eight minutes after dialysis begins with a new dialyzer, a patient develops generalized itching, wheezing, facial swelling, and blood pressure of 72/40 mm Hg. No medication has been infused; circuit blood looks normal, no air is visible, and temperature and conductivity are within range. Which option identifies the event and required response?
Correct answer: B - Type A reaction: stop, clamp, do not return blood, and activate emergency response
Midway through treatment, a patient reports a painful calf cramp and lightheadedness. Blood pressure has fallen from 132/74 to 96/58 mm Hg; the patient is alert and has no chest pain or dyspnea. The first intervention should be to:
Correct answer: D - Stop or reduce ultrafiltration, position safely, reassess, and notify the nurse
The CCNT exam also covers these domains. Drill them in the full free practice test:
The full bank has 1,020 more CCNT questions with explanations.
Continue in the free practice test →
View plans