Normal Lab Values

Question 1

GFR

Answer 1

120 ml/min
or
steady state (not acute)
female: ( 140 - age ) x .85 
male: 140 - age

Question 2

renal plasma flow

Answer 2

600 ml/min

*PAH

Question 3

plasma pH

Answer 3

7.4
7.35-7.45
extremes compatible with life: 6.8 to 7.8

Question 4

plasma osmolality

Answer 4

285-295 mOsm/kg H2O

Question 5

creatinine produced

Answer 5

2g/day

180L/day

Question 6

plasma HCO3

Answer 6

24 mEq/l

22-26 mEq/l

Question 7

plasma pCO2

Answer 7

40 mmHg

36-44 mmHg

Question 8

plasma anion gap

Answer 8

8-12 mEq/l

Question 9

plasma Na

Answer 9

140 mEq/l

Question 10

plasma K

Answer 10

4.5 mEq/l

4-5 mEq/l

Question 11

plasma Cl

Answer 11

105 mEq/l

Question 12

urine ammonium (NH4)

Answer 12

30-40 mEq/d

Question 13

urine anion gap

Answer 13

10 mEg/l
low or neg: decrease in bicarb
if decrease in bicarb does not cause a low UAG: renal tubular acidification defect

Question 14

Cosm

Answer 14

2 +/- 0.5 ml/min

Question 15

specific gravity

Answer 15

isothenuria: 1.010
max dilute: 1.002
max concentrate: 1.030

Question 16

urinary pH

Answer 16

5 - 6.5
less than 5.5: metabolic acidosis
greater than 7.5: UTI

Question 17

RBC in urine

Answer 17

0-2 RBC/hpf

neg. dipstick

Question 18

WBC in urine

Answer 18

0-4 WBC/hpf

Question 19

BUN

Answer 19

10 mg/dl

Question 20

plasma creatinine

Answer 20

1.0 mg/dl

Question 21

plasma Ca

Answer 21

9.0-10.0 mg/dl

Question 22

plasma phosphorus

Answer 22

4.0-5.0 mg/dl

Question 23

plasma albumin

Answer 23

4.0-4.5 g/dl

Question 24

urine Na

Answer 24

concentrated urine: less than 20 mEq/l

dilute urine: greater than 20 mEq/l

Question 25

urine Cl

Answer 25

concentrated urine: less than 20 mEq/l

dilute urine: greater than 20 mEq/l

Question 26

urine K

Answer 26

concentrated urine: less than 20 mEq/l

dilute urine: greater than 20 mEq/l

Question 27

urine osmolarity

Answer 27

concentrated urine: 1000 - 200 mOsm/ kg H2O

dilute urine: 50 - 100 mOsm/kg H2O

Question 28

transtubular K gradient (TTKG)

Answer 28

hypokalemia: less than 2
hyperkalemia: greater than 8’
invalid if: urine Na less than 20 mEq/L or Uosm less than 300 mOsm/kg

Question 29

urine protein

Answer 29

40-80 mg/day

kids: 30 mg/day

Question 30

urine albumin/creatinine ratio

Answer 30

less than 30 mg/g

Question 31

spot urine protein creatinine ratio

Answer 31

less than 0.15