Tests of Renal Function

Question 1

What is a normal urinanalysis

Answer 1

GFR 125ml/min
pH 4.6-8
SG 1.010-1.025
Protein, glucose, and RBC negative

Question 2

What is the normal vlaue of BUN

Answer 2

normal value 10-20 mg/dl

Question 3

What two things affect BUN

Answer 3

hydration and protein intake

Question 4

How does hydration affect BUN

Answer 4

with less volume in the blood (dehydration) the concentration of BUN increases
the opposite goes for over hydration

Question 5

About how much renal function loss must happen before you see a significant rise in BUN levels

Answer 5

two thirds

Question 6

When might you start seeing a slight increase of BUN

Answer 6

when kidneys start to fail

Question 7

What does BUN represent in the blood

Answer 7

how much metabolic waste is in the blood or hydration status

Question 8

How does protein intake affect BUN

Answer 8

it is a byproduct of protein metabolism so if you have more protein to break down, you’ll have more BUN

Question 9

What is the normal value of serum creatinine

Answer 9

.7 mg/dL of blood for small frame women
1 mg/dl of blood for normal adult male
1.5 for muscular man

Question 10

What does creatinine levels reflect

Answer 10

GFR

Question 11

What happens to creatinine levels in elderly and why

Answer 11

it drops because muscle mass and GFR declines

Question 12

What is creatinine used to check for

Answer 12

GFR and renal function

Question 13

As GFR drops what happens to creatinine

Answer 13

increases

Question 14

If creatinine is three times the normal value what has probably happened to the kidnye

Answer 14

its lost 75% of its function

Question 15

What is the standard for urine tests

Answer 15

24 hr urine collection + serum creatinine level

Question 16

Whats the goal for urine output

Answer 16

30 ml/hr

Question 17

What is renal function affected by

Answer 17

Genetic 
Obstructions
       -Structural 
       -Stones
Tumors
Infection
Inflammation

Question 18

What are some scenarios where creatinine normal levels may vary

Answer 18

elderly cause muscle mass decreases

african american slightly- causes they tend to have more muscle mass