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#1
07-20-2010
 USMLE Forums Guru Steps History: Not yet Posts: 414 Threads: 30 Thanked 87 Times in 70 Posts Reputation: 97
Calculation of GFR!

During an experiment, the following data were obtained from an anesthetized dog: mean glomerular capillary hydrostatic pressure – 45, mean Bowman space hydrostatic pressure – 12, mean glomerular capillary oncotic pressure – 23, mean Bowman space oncotic pressure – 0, coefficient of filtration (Kf) – 3, renal blood flow – 200, Hct – 40%. Which of the following best represents the glomerular filtration rate in this animal?
(a) 30 (b) 50 (c) 90 (d) 120 (e) 180
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#2
07-20-2010
 USMLE Forums Guru Steps History: --- Posts: 487 Threads: 69 Thanked 296 Times in 133 Posts Reputation: 316
A 30

its A...30

GFR= kf((pg-pb)-(Ig-ib))
= 3(45-12-23)
= 3(10)
= 30
#3
07-20-2010
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i l go for A- 30
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#4
07-21-2010
 USMLE Forums Master Steps History: Step 1 Only Posts: 919 Threads: 134 Thanked 1,324 Times in 364 Posts Reputation: 1347

yes they are both right. answer is A.

although i have a question, how long did it take u guys to calculate the answer? it took me a good minute as i had to write down which was Pc, Pi, etc... i feel like a real grandma taking so much time to answer.
#5
07-22-2010
 USMLE Forums Veteran Steps History: 1 + CS Posts: 209 Threads: 34 Thanked 92 Times in 30 Posts Reputation: 122

yup A

i just calculated in my mind , heheh i m good at math so didnt take more than 35 sec ,but i dont think 1 min is a prob still u did it on time ( less than whatever time got for 1 question)

 Tags Physiology-, Renal-, Step-1-Questions

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