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Kaplan Qbank USMLE

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0 votes


Author6 Posts
  #1

A 35 year old man is reffered to a renal clinic for evaluation of proteinuria. He has no complaints other than a foamy urine. The following data are obtained.

Inulin clearance........................100ml?min

Plasma osmolarity.....................286mOsm/L

Plasma Sodium concentration.....140mEq/L

Urine flow.................................1.44L/24Hrs.

Urine osmolarity........................205mOsm/L

Urine Sodium Concentration.......100mEq/L

What is the Sodium reabsorption per day in this patient?

I am not giving choices in this question because you have to reach an answer and not pick one.

Good luck.

  #2

net transport rate = filtration rate - excretion rate

= [ GFR X P(Na) ] - [ U(Na) X V ]

= [100 X 140] - [100 X 1.44L]

= 14 mEq/min - 0.1 mEq/min

= 13.9 mEq/min

lengthy rather than difficult!

___________________
life is guud

  #3

Hi
The urine flow is L/24hr ?
Don't you have to calculate anything before out it in equation?
Or it is even ml/min already?
because the concentreation is meq/ml
thankx

  #4

yea buddy ofourse u gotta manage all those things...try solving it in the rough and ull get the same ans!

___________________
life is guud

  #5

:?: well I don´t know exactly how you got to the conclusion that 1.44L/24h x 100mEq/ml is 0.1meq/min. I´m struggling with the convesion of mEq to ml, how´d you do that?

___________________
Confidence does not come from simply reading the content, but from doing things with it. Confidence is born in the flash of insight, in the ability to face something new and figure it out.
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  #6

hey dude u don't convert mEq into ml or L....simple.....L :arrow: ml will cancel other ml.....all tht is left in the eq. will be mEq/min

___________________
life is guud







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