Blood banks will shortly start to screen all donors for NANB : GMAT Critical Reasoning (CR)
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# Blood banks will shortly start to screen all donors for NANB

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Manager
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Blood banks will shortly start to screen all donors for NANB [#permalink]

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08 Jun 2007, 21:53
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Blood banks will shortly start to screen all donors for NANB hepatitis. Although the new screening tests are estimated to disqualify up to 5 percent of all prospective blood donors, they will still miss two-thirds of donors carrying NANB hepatitis. Therefore, about 10 percent of actual donors will still supply NANB-contaminated blood.

Q. The argument above depends on which of the following assumptions?

A. Donors carrying NANB hepatitis do not, in a large percentage of cases, carry other infections for which reliable screening tests are routinely performed.

B. Donors carrying NANB hepatitis do not, in a large percentage of cases, develop the disease themselves at any point.

C. The estimate of the number of donors who would be disqualified by tests for NANB hepatitis is an underestimate.

D. The incidence of NANB hepatitis is lower among the potential blood donors than it is in the population at large.

E. The donors who will still supply NANB-contaminated blood will donate blood at the average frequency for all donors
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Manager
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08 Jun 2007, 22:15
A.
Manager
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08 Jun 2007, 22:16
E.
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08 Jun 2007, 22:19
Actually, I rescind my choice of A and go with E also. I was originally thinking that individulals with hepitisis would be more likely to have other diseases that are easier to screen and thus would be picked out, but that's not what the question is asking.
Director
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09 Jun 2007, 09:10
sludge wrote:
Actually, I rescind my choice of A and go with E also. I was originally thinking that individulals with hepitisis would be more likely to have other diseases that are easier to screen and thus would be picked out, but that's not what the question is asking.

You were correct originally sludge...you gave the right reason also...Negate A and you will find the answer...A it is.
Director
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09 Jun 2007, 09:34
go with A
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09 Jun 2007, 15:56
I don't know why "A" is the answer..
Other infection is related to NANB hepatitis?
I go with "E"..
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09 Jun 2007, 16:21
how is this not B?
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09 Jun 2007, 17:07
A.
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10 Jun 2007, 09:29
I like E

if the donors increase the amount of blood giving , it will skew the results , since the amount of tainted blood would be increased even though the percentage of people who carry the disease remain the same
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11 Jun 2007, 03:45
Facts:- Blood banks will shortly start to screen all donors for NANB hepatitis
- Although the new screening tests are estimated to disqualify up to 5 percent of all prospective blood donors, they will still miss two-thirds of donors carrying NANB hepatitis
Conclusion:
- about 10 percent of actual donors will still supply NANB-contaminated blood

Let's look at the options
A - Assumption is correct.
Donors carrying NANB hepatitis do not, in a large percentage of cases, carry other infections for which reliable screening tests are routinely performed. If they do then they would be caught in the more reliable tests and hence the percentage would go down.

B - Eliminate - No evidence of about developing a disease.
C - Eliminate - No evidence of under-estimating or over estimating.
D - Eliminate - Out of scope - Population at large
E - Eliminate - No evidence of frequency.

11 Jun 2007, 03:45
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