Staphylococcus Saprophyticus and Nitrite urine test? - USMLE Forums
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  #1  
Old 03-16-2012
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Urine Sample Staphylococcus Saprophyticus and Nitrite urine test?

Does Staphylococcus saprophyticus show positive or negative nitrite test??

FA says positive and Kaplan Qbank says negative !
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Old 03-16-2012
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- E.coli:
--- Most common organism for UTIs
--- gram negative
--- Nitrite test positive

- Staphylococcus saprophyticus
---- 2nd most common organism for UTIs
--- Nitrite test negative
--- gram positive

- Do know the differences! They will have you to differentiate the different bugs that cause UTIs.

Hope it helped! =)
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Old 03-16-2012
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Gram positives such staph do not cause Nitrite positive test in the urine.

Learn more about this concept here
Nitrite and Leukocyte Esterase in Urine

-
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Old 03-16-2012
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Thanks alot
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Old 03-16-2012
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nitrite test means gram negative, and we all know staph is gram positive so it would be negative for this test.
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Old 03-16-2012
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ya i know but first aid says that s.saprophyticus is an exception, thats why i asked
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Old 03-22-2012
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Quote:
Originally Posted by Drbooda View Post
ya i know but first aid says that s.saprophyticus is an exception, thats why i asked
I saw the same thing in FA and struggled with it.
I think it's just bad phrasing. When it says "except S. saprophyticus", I'm assuming it means all the bugs they list will be Nitrite negative, except the staph.
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