CDN exam 2025 Questions and
Answers
What does kidneys do ? - ANSWER✔✔-Remove water and waste - kidneys, test, and filter each
drop of blood and waste and extra water to the bladder as urine
Keep salt and other electrolytes in valance - electrolytes carry signals between nerves and muscles
Control blood pressure - kidneys keep water/salt and balance and make an enzyme called Renin that
can raise blood pressure if it drops too low
Keeps bone strong - kit needs help convert vitamin D into an active form ( calcitrol ) So calcium can
be absorbed
Maintain acid base balance - kidneys help keep our blood and bodies at the pH level that lets our
organs work as well as possible
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,Helping ensure the right level of red blood cells - kidney sense if there are enough red blood cells in
the blood, not enough? They send a hormone erythropoietin to the bone marrow to make more
What happens during a dialysis session? - ANSWER✔✔-A blood pump pulls blood out of the
patient through one needle (arterial) and pushes it to a dialyzer.
Inside the dialer, blood is filter and cleaned: waste and water passes out of the blood through hollow
hair, like fiber in the dialyzer and into a cleaning fluid called dialysis
Then the blood goes back to the patient through another needle ( Venus )
Used dialysate is sent to the drain
The dialysis machine sets the rate of blood flow and mixes purified, water concentrates to make and
deliver dialysate. There are many safety checks and alarms in the machine to make sure that the
treatment is is being done right
What is Medicare and stage renal disease program? - ANSWER✔✔-This program gives coverage to
patient who have worked enough to qualify for Social Security or to their dependence
What are the different parts of Medicare? - ANSWER✔✔-Medicare part a - covers hospitalizations
and is free for those who qualify
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
, Medicare part B - outpatient care such as dialysis. Patient must pay a premium for part B.
Medicare part D - pays for medication
Patient need to have a second health plan along with Medicare, such as Medicaid or Medigap, to pay
the balance that Medicare does not cover
Cms makes rules for ? - ANSWER✔✔-CMS makes rolls that all dialysis clinics must follow if they
want to be paid. These rules are called the conditions for coverage for in stage renal disease facilities.
What if some patients have employer group health plans? - ANSWER✔✔-Some patients have
employer group health plans through their own job or a spouses job. Employee group health plans
are primary, they pay first for the first 30 months after a patient can get Medicare. Medicare is
secondary during those 30 months and May pay some all of what employer group health plans don't
cover
After the 30 months are up the insurance coverage switches, Medicare becomes primary and
employer group health plans a secondary. Group health plans tend to pay much more than
Medicare. This means that dialysis clinics can bring in more revenue. ( I think the are called
commercial pts )
When does Medicare start to pay? - ANSWER✔✔-Patients who don't have Medicare when they
start dialysis must wait three months for it to start to pay if they do end center dialysis
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
Answers
What does kidneys do ? - ANSWER✔✔-Remove water and waste - kidneys, test, and filter each
drop of blood and waste and extra water to the bladder as urine
Keep salt and other electrolytes in valance - electrolytes carry signals between nerves and muscles
Control blood pressure - kidneys keep water/salt and balance and make an enzyme called Renin that
can raise blood pressure if it drops too low
Keeps bone strong - kit needs help convert vitamin D into an active form ( calcitrol ) So calcium can
be absorbed
Maintain acid base balance - kidneys help keep our blood and bodies at the pH level that lets our
organs work as well as possible
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,Helping ensure the right level of red blood cells - kidney sense if there are enough red blood cells in
the blood, not enough? They send a hormone erythropoietin to the bone marrow to make more
What happens during a dialysis session? - ANSWER✔✔-A blood pump pulls blood out of the
patient through one needle (arterial) and pushes it to a dialyzer.
Inside the dialer, blood is filter and cleaned: waste and water passes out of the blood through hollow
hair, like fiber in the dialyzer and into a cleaning fluid called dialysis
Then the blood goes back to the patient through another needle ( Venus )
Used dialysate is sent to the drain
The dialysis machine sets the rate of blood flow and mixes purified, water concentrates to make and
deliver dialysate. There are many safety checks and alarms in the machine to make sure that the
treatment is is being done right
What is Medicare and stage renal disease program? - ANSWER✔✔-This program gives coverage to
patient who have worked enough to qualify for Social Security or to their dependence
What are the different parts of Medicare? - ANSWER✔✔-Medicare part a - covers hospitalizations
and is free for those who qualify
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
, Medicare part B - outpatient care such as dialysis. Patient must pay a premium for part B.
Medicare part D - pays for medication
Patient need to have a second health plan along with Medicare, such as Medicaid or Medigap, to pay
the balance that Medicare does not cover
Cms makes rules for ? - ANSWER✔✔-CMS makes rolls that all dialysis clinics must follow if they
want to be paid. These rules are called the conditions for coverage for in stage renal disease facilities.
What if some patients have employer group health plans? - ANSWER✔✔-Some patients have
employer group health plans through their own job or a spouses job. Employee group health plans
are primary, they pay first for the first 30 months after a patient can get Medicare. Medicare is
secondary during those 30 months and May pay some all of what employer group health plans don't
cover
After the 30 months are up the insurance coverage switches, Medicare becomes primary and
employer group health plans a secondary. Group health plans tend to pay much more than
Medicare. This means that dialysis clinics can bring in more revenue. ( I think the are called
commercial pts )
When does Medicare start to pay? - ANSWER✔✔-Patients who don't have Medicare when they
start dialysis must wait three months for it to start to pay if they do end center dialysis
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
