acute tubular necrosis vs. prerenal uraemia

Question 1

urine sodium - prerenal

Answer 1

< 20

Question 2

urine sodium - acute tubular necrosis

Answer 2

> 40

Question 3

urine osmolality - prerenal

Answer 3

> 500

Question 4

urine osmolality - acute tubular necrosis

Answer 4

< 350

Question 5

fractional sodium excretion - prerenal

Answer 5

< 1%

Question 6

fractional sodium excretion - acute tubular necrosis

Answer 6

> 1%

Question 7

response to fluid challenge - prerenal

Answer 7

good

Question 8

response to fluid challenge - acute tubular necrosis

Answer 8

bad

Question 9

urea:creatinine ratio - prerenal

Answer 9

raised

Question 10

urea:creatinine ratio: acute tubular necrosis

Answer 10

normal

Question 11

urea excretion - prerenal

Answer 11

< 35%

Question 12

urea excretion: acute tubular necrosis

Answer 12

> 35%

Question 13

urine:plasma osmolality - prerenal

Answer 13

> 1.5

Question 14

urine:plasma osmolality - acute tubular necrosis

Answer 14

< 1.1

Question 15

urine:plasma urea - prerenal

Answer 15

> 10:1

Question 16

urine:plasma urea: acute tubular necrosis

Answer 16

< 8:1

Question 17

specific gravity: prerenal

Answer 17

> 1020

Question 18

specific gravity: acute tubular necrosis

Answer 18

< 1010

Question 19

urine - prerenal

Answer 19

normal

Question 20

urine - acute tubular necrosis

Answer 20

brown granular casts

Question 21

prerenal - what do kidneys do with sodium

Answer 21

hold onto it to preserve volume