UTI Small Group Flashcards
What agar is used for culturing urine?
What does dark colony mean?
What does colorless colony mean?
EMB agar - only grows GNRs.
Dark colony = lactose fermenter.
Colorless = non-lactose fermenter
Does E coli break down lactose?
E coli may produce so much acid from lactose breakdown that a metallic green sheen is evident
What are most common causes of CA UTI?
E coli causes 80%. Others include Proteus, enterococci, and staph.
What are most common causes of nosocomial UTI?
Hospital acquired: E coli, Pseudomonas, Proteus, and Serratia
Which pxs do you screen for UTI’s?
Pregnant women and those undergoing urinary tract surgery.
What does suprapubic pain indicate?
Cystitis (bladder infection)
What CFU count indicates infection? Contamination?
> 100,000 indicates infection
What could cause artificially high / low CFU numbers?
- Artificially low numbers may be seen if pxs are urinating frequently, if urine is dilute, or they were given IV fluids. Collecting first morning void helps avoid this.
- Artificially high numbers may be present due to contamination or delay in transport (growth).
When are MBC tests done? (4)
Usually only done for pxs w/ meningitis, endocarditis, osteomyelitis, or immunocompromised host.
What is most common Gram Pos coccus causing CA UTI’s in sexually active females?
Staph saprophyticus
Sxs / Tx of pyelonephritis
Pain, fever, rigors, even septic shock.
Must treat w/ IV AB’s for at least 7 days.
What are the 3 classic sxs of cystitis?
Painful urination (dysuria), urgency, and increased frequency.
What does cloudy urine mean?
UTI; white cells
What if px comes in w/ clear urine but dysuria?
STI; less often white cells
What 2 AB’s are best for UTI’s?
TMP-sulfa and Nitrofurantoin
