Mikeland
Forum Senior
Topics: 24
Posts: 109
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A 35-year-old man is referred to the renal clinic for evaluation of proteinuria. He has no
complaints other than foamy urine. The following data are obtained from the patient:
Inulin clearance 100 mL/min
Plasma osmolarity 286 mOsm/L
Plasma sodium concentration 140 mEq/L
Urine flow 1.44 L / 24 hour
Urine osmolarity 205 mOsm/L
Urine sodium concentration 100 mEq/L
How much sodium does this patient reabsorb each day?
A. 14 mEq
B. 144 mEq
C. 244 mEq
D. 20,016 mEq
E. 20,160 mEq
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| po
Forum Elite
Topics: 39
Posts: 356
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Inulin clearance 100 mL/min-LOW
Inulin clearance Male:124 ± 26 ml/min
Female:119 ± 13 ml/min
REF-http://courses.washington.edu/hubio562/normalLabs.html
Plasma osmolarity 286 mOsm/L-NORMAL[N-276 - 295 mOsm/kg]
Plasma sodium concentration 140 mEq/L-NORMAL
Urine flow 1.44 L / 24 hour-7ml/6min-ie more than 1ml/min~NORMAL
Urine osmolarity 205 mOsm/L-IS LESS THAN PLASMA-ABNORMAL
Urine sodium concentration -?
cant get anywhere with this Q,
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| po
Forum Elite
Topics: 39
Posts: 356
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got some links that gives formula applied that got ZERO AS ANSWER.
http://www.life.umd.edu/classroom/bsci440/higgins...
http://sprojects.mmi.mcgill.ca/nephrology/present...
I would like to get this concept clear though mugging up is always llast option.
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| edie
I can, and I will.
Topics: 26
Posts: 1,235
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So many conversions to do before doing the actual work--just gotta love these types of q's 
Is it A?
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| po
Forum Elite
Topics: 39
Posts: 356
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would really like to love the Q,only if I could understand it 
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| kiterunner
Forum Junior
Topics: 14
Posts: 65
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Is it the equation - [GFR X Px - Urine volume X urine conc. of the solute] ???
My answer ud be A using that equation for determining absorption vs. secretion.
Do u think they`d give us such big calculations anyways??? I mean ... it took me more than 72 seconds to convert the units  but may I`m just dumb and there are easier ways to go around it
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| hope4dabest
Forum Elite
Topics: 16
Posts: 433
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can anyone plzz explain how and what is the answer???
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| hope4dabest
Forum Elite
Topics: 16
Posts: 433
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evn i was using the avove formula bu doesnt come to 14 i guess....here gfr gonna be 100 in this case...right???
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| drgho
Forum Junior
Topics: 1
Posts: 115
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Using the formula by kiterunner and after adjusting the units, I got D.
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| shumaila
Forum Elite
Topics: 58
Posts: 347
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the answer is A
sodium reabsorbed =amount filtered - amount excreted
amount filtered =GFRXplasma Na conc
=100X140 or 0.1X140=14
rate of excretion=urine flow xurine Na conc
1.44l/24hr=1.44x100/24X60
=0.1
so Na reabsorbed =14-0.1=13.9 so 14 A is answer
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| drgho
Forum Junior
Topics: 1
Posts: 115
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13.9 mEq is the amount reabsorbed in 1 min. The question is for one day and it should be D.
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| njcjzy
Forum Guru
Topics: 16
Posts: 702
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It's D.
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