• 5 Day FREE Trial
Study Smarter, Not Harder

Available with Beat the GMAT members only code

• Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

• FREE GMAT Exam
Know how you'd score today for $0 Available with Beat the GMAT members only code • Free Practice Test & Review How would you score if you took the GMAT Available with Beat the GMAT members only code • Get 300+ Practice Questions 25 Video lessons and 6 Webinars for FREE Available with Beat the GMAT members only code • 1 Hour Free BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • 5-Day Free Trial 5-day free, full-access trial TTP Quant Available with Beat the GMAT members only code • Award-winning private GMAT tutoring Register now and save up to$200

Available with Beat the GMAT members only code

• Free Trial & Practice Exam
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• Free Veritas GMAT Class
Experience Lesson 1 Live Free

Available with Beat the GMAT members only code

## Appendicitis

tagged by:

This topic has 5 expert replies and 18 member replies
Goto page
• 1,
• 2
gmat740 MBA Student
Joined
16 Aug 2008
Posted:
1194 messages
Followed by:
15 members
71
GMAT Score:
710

#### Appendicitis

Wed Jul 29, 2009 8:40 pm
Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since .......

Which of the following logically completes the passage?

A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis
B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it
C. all of the patients who are diagnosed with this test as having appendicitis do, in fact,have appendicitis
D. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis
E. the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis

OA-B

Last edited by gmat740 on Thu Jul 30, 2009 2:52 am; edited 1 time in total

madhur_ahuja Master | Next Rank: 500 Posts
Joined
02 May 2009
Posted:
435 messages
17
Wed Jul 29, 2009 10:34 pm
Its B ..

italian7745 Master | Next Rank: 500 Posts
Joined
24 May 2009
Posted:
113 messages
4
Thu Jul 30, 2009 1:04 am
IMO D

gmat740 MBA Student
Joined
16 Aug 2008
Posted:
1194 messages
Followed by:
15 members
71
GMAT Score:
710
Thu Jul 30, 2009 1:19 am
Its B ..

nervesofsteel Legendary Member
Joined
14 Aug 2008
Posted:
594 messages
12
Thu Jul 30, 2009 1:49 am
gmat740 wrote:
Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since .......

Which of the following logically completes the passage?

A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis
B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it
C. all of the patients who are diagnosed with this test as having appendicitis do, in fact,have appendicitis
D. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis
E. the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis
if misdiagnoses are always instances where the appendicitis was not there then doctors will not miss the right cases... they may still perform certain unnecessary operations due to misdiagnosis but they will not miss the cases which were really suffering....

viju9162 Master | Next Rank: 500 Posts
Joined
11 Jun 2007
Posted:
434 messages
6
Target GMAT Score:
750+
GMAT Score:
600
Thu Jul 30, 2009 2:44 am
ya i also feel its B

_________________
"Native of" is used for a individual while "Native to" is used for a large group

niraj_a Legendary Member
Joined
01 Jun 2008
Posted:
708 messages
Followed by:
1 members
13
Thu Jul 30, 2009 2:41 pm
i chose C, between C and B. i thought that removing the appendix of a person who does not have the inflammation is a major misdiagnosis.

is OG / Gprep the source?

Spring2009 Master | Next Rank: 500 Posts
Joined
21 Nov 2008
Posted:
101 messages
2
Thu Jul 30, 2009 7:29 pm
niraj_a wrote:
i chose C, between C and B. i thought that removing the appendix of a person who does not have the inflammation is a major misdiagnosis.
is OG / Gprep the source?
This is what B mentions.

kaulnikhil Master | Next Rank: 500 Posts
Joined
17 Apr 2009
Posted:
338 messages
Followed by:
3 members
9
Target GMAT Score:
7**
Fri Jul 31, 2009 12:25 am
the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it

now look at this way
the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does, in fact, have it

option 1 says that doctors will perform some misdiagnosis. but they wont miss on any one who has it ...wont miss on necessary ones

now refer to second one means 2 say that doctors will perform some misdiagnosis but will miss on anyone who has it ..so they miss on necessary ones

now let us analyse C
all of the patients who are diagnosed with this test as having appendicitis do, in fact,have appendicitis

fine all patients diagnosed have appendicitics .. good ..but what about the remaining people they still might b wrongly diagnosed as in case 2

iamcste Legendary Member
Joined
26 Aug 2008
Posted:
940 messages
Followed by:
1 members
55
Thu Mar 04, 2010 4:19 am
while B is correct, Can any one comment specifically why A, D and E are incorrect?

max37274 Senior | Next Rank: 100 Posts
Joined
22 Oct 2009
Posted:
93 messages
2
Thu Mar 04, 2010 4:47 am
Please explain the meaning of "without, however, performing any fewer necessary ones than before, since ....... "

subgeeth Master | Next Rank: 500 Posts
Joined
02 Dec 2009
Posted:
167 messages
4
Target GMAT Score:
7**
Thu Mar 04, 2010 11:58 am
can any one explain what does the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it means

I didnt understand this line

Does it mean misadiagnoses are giving correct results or wrong results am not clear with this line

gmatmachoman Legendary Member
Joined
28 Jul 2008
Posted:
2326 messages
Followed by:
2 members
173
Target GMAT Score:
740
GMAT Score:
710
Thu Mar 04, 2010 12:51 pm
gmat740 wrote:
Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since .......

Which of the following logically completes the passage?

A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis

B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it
C. all of the patients who are diagnosed with this test as having appendicitis do, in fact,have appendicitis
D. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis
E. the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis

OA-B
A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses.

Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before,-------------

Accurate Diagnosis can be defined as :

Patient as the symptom and the test scan is able to rightly predict that symptom.

Patient does not have the symptom and the test scan is able to predict rightly that patient does NOT have the symptom.

Misdiagnosis is defined as:

Patient has the symptom and the TestScan is not able to predict it properly

OR

Patient doesnot have symptom but the testscan predicts that patient has Symptom.

Now the newTest Scan, produces two misdiagnoses for every 98 correct diagnoses. So it can be any of the 2 above said conditions.

Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before,------------------

How Doctors can avoid unnecessary operations???If the testscan results that shows symtoms for a person who does NOT really have any symptom (inflammation) then Doctor can avoid the unnecessary operation.

U can even try Negating B.

the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does NOT, in fact, have it

After Negation,

the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does in fact, have it...

If this is the case, the whole advantage of using the new test scan is useless!!

Agreed, It was not easy for me to explain the nuances of the Argument.

If not clear ,plz dont hesitate to raise the flag!

Adding on to that, this was Karan's post..So for tougher post u can always review his older posts.

For some great quality post u can refer Maihuna,DanaJ,Jogitech,Pandey_Vineet,Komal,Fibbonnaci ,Pheonix, and ofcourse mine too for voulmes of posts.

For replies needless to mention plz gothru Testluv and all experts posts.

ssgmatter Legendary Member
Joined
06 Jan 2010
Posted:
549 messages
Followed by:
3 members
16
Test Date:
TBD
Target GMAT Score:
750
Fri Mar 19, 2010 9:04 pm
Thanks for the awesome explanations guys....

But i am still not able to understand the meaning of this line of the sentence in the arg that says

Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before

Thanks a heap!

Regards,
Phil

### GMAT/MBA Expert

kevincanspain GMAT Instructor
Joined
22 Mar 2007
Posted:
613 messages
Followed by:
63 members
171
GMAT Score:
790
Sat Mar 20, 2010 12:54 pm
How could such a test lead doctors not to perform all the necessary operations? Only if such a test misdiagnosed genuine cases of appendicitis.

_________________
Kevin Armstrong
GMAT Instructor
Gmatclasses

Free GMAT Practice Test under Proctored Conditions! - Find a practice test near you or live and online in Kaplan's Classroom Anywhere environment. Register today!

### Top First Responders*

1 GMATGuruNY 69 first replies
2 Rich.C@EMPOWERgma... 41 first replies
3 Brent@GMATPrepNow 40 first replies
4 Jay@ManhattanReview 24 first replies
5 Terry@ThePrinceto... 10 first replies
* Only counts replies to topics started in last 30 days
See More Top Beat The GMAT Members

### Most Active Experts

1 GMATGuruNY

The Princeton Review Teacher

134 posts
2 Jeff@TargetTestPrep

Target Test Prep

111 posts
3 Rich.C@EMPOWERgma...

EMPOWERgmat

111 posts
4 Scott@TargetTestPrep

Target Test Prep

103 posts
5 Max@Math Revolution

Math Revolution

92 posts
See More Top Beat The GMAT Experts