Final study guide: Renal labs

Question 1

Acidosis

Answer 1

pH < 7.35 from accumulated waste products

Question 2

BUN (5)

Answer 2

*(not a reliable indicator of kidney damage)
 Normal range 9 – 20 mg/dl
 Must not be interpreted alone for renal failure
 BUN is a by-product of protein metabolism
 Decrease GFR causes a fall in urea excretion and an increase in BUN

Question 3

Reasons for elevated BUN but normal Cr (3)

Answer 3

 Blood in the GI tract (hemorrhaging/hypovolemia)
 Decreased volume (dehydration)
 Increased protein intake (protein catabolism)

Question 4

Serum Cr: what (6)

Answer 4

 Creatinine is a by-product of muscle metabolism
 Creatinine appears in the serum in amounts proportional to the body muscle mass
 Levels are higher in males than females
 Normal levels are 0.7 – 1.5 mg/dl
 When the value doubles—this reflects a 50% decrease in GFR
 Normal ratio of BUN to creatinine is 10-20:1

Question 5

Urine analysis

Answer 5

 Help ID prerenal, intrarenal or postrenal

Question 6

how is CVP affected by AKI

Answer 6

high R/T increased volume

Question 7

how is Wedge affected by AKI

Answer 7

high R/T increased volume

Question 8

how is CO/CI affected by AKI

Answer 8

high R/T increased volume

Question 9

how is daily weight affected by AKI (2)

Answer 9

*reflects weight gain/loss over 1 – 2 days
*A 1kg weight gain = 1000ml of additional fluid retention