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In that case, I would suspect that the culture ordered from the lab repors only >10^5 CFU, and a lower level of E coli was present in the urinary tract -- enough to cause a positive nitrate, but not enough to be reported as "UTI" on the culture.

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Q: What about a positive nitrate in urine- but uti is ruled out?
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What causes nitrate in urine?

Nitrate in the urine indicates that there might be bacteria in your urinary tract or in your bladder. As such, nitrate tests are used to quickly assess whether a person may have a UTI (urinary tract infection) for example. If nitrate is found, no matter the hypothesized cause, other medical tests usually follow.


Can a UTI result in the presence of blood in the urine?

Yes, a UTI can result in the presence of blood in the urine.


Can you have blood in your urine when you have a UTI?

Yes, blood in the urine can be a symptom of a urinary tract infection (UTI).


Can you have blood in your urine with a UTI"?

Yes, blood in the urine can be a symptom of a urinary tract infection (UTI).


What causes nitrate to show up in urine samples in women?

Some of the bacteria known to cause urinary tract infections (UTI's) have an enzyme that change nitrate to nitrite. A positive nitrite test indicates that bacteria may be present in significant numbers in urine.reference:- http://www.medscape.com/viewarticle/410581- http://library.med.utah.edu/WebPath/TUTORIAL/URINE/URINE.html


Does a UTI cause blood in urine?

Yes, a urinary tract infection (UTI) can cause blood in the urine. This is known as hematuria and can be a symptom of a UTI.


If you have a UTI will blood show in urine?

It's not unusual to have blood in the urine with UTI, but it doesn't not always occur.


Can a UTI cause blood in the urine?

Yes, a urinary tract infection (UTI) can cause blood in the urine.


Can a UTI cause blood in your urine?

Yes, a UTI (urinary tract infection) can cause blood in your urine.


Have you experienced any symptoms of a UTI, such as blood in the urine"?

Have you had any signs of a UTI, like blood in your urine?


Have you experienced any symptoms of a UTI, such as blood in your urine"?

Have you had any signs of a UTI, like blood in your urine?


Is it normal to have blood in the urine with a UTI?

Yes, it is normal to have blood in the urine with a urinary tract infection (UTI).