Objective 15: Compare and Contrast Upper and Lower UTIs Including Clinical Manifestations and Changes in Urinalysis

Lower Urinary Tract Infection

Infection of the bladder or urethra.

Upper Urinary Tract Infection

Infection of the renal pelvis or kidney tissue.

Lower UTI Examples

Cystitis and urethritis.

Upper UTI Examples

Pyelitis and pyelonephritis.

Lower UTI Manifestations

Frequency, urgency, dysuria, nocturia, and pelvic discomfort.

Upper UTI Manifestations

Lower urinary symptoms plus flank pain, high fever, chills, and shaking.

Bacteriuria in UTI

Presence of bacteria in urine; can occur in both upper and lower UTIs.

Pyuria in UTI

Increased white blood cells in urine; can occur in both upper and lower UTIs.

Hematuria in UTI

Blood in urine that can occur with irritation and inflammation in either location.

Urinary Casts

Structures formed in renal tubules that suggest kidney involvement.

Casts in Lower UTI

Generally absent when infection is confined to the bladder or urethra.

Casts in Upper UTI

May be present in pyelonephritis because the infection involves the kidneys.

Renal Involvement

Indicated by systemic symptoms and urinary casts in the appropriate clinical context.

What structures are involved in lower UTIs?

The bladder and urethra.

What structures are involved in upper UTIs?

The renal pelvis and kidney tissue.

What are examples of lower UTIs?

Cystitis and urethritis.

What are examples of upper UTIs?

Pyelitis and pyelonephritis.

What are the typical manifestations of a lower UTI?

Frequency, urgency, dysuria, nocturia, and pelvic discomfort.

What additional symptoms suggest an upper UTI?

Flank or back pain, high fever, chills, and shaking.

Can bacteriuria occur in both upper and lower UTIs?

Yes, both may have bacteria present in the urine.

Can pyuria occur in both upper and lower UTIs?

Yes, both may have increased white blood cells in the urine.

Can hematuria occur in both upper and lower UTIs?

Yes, inflammation and irritation can cause blood in the urine.

Why are urinary casts important when distinguishing upper and lower UTIs?

Casts form in renal tubules and suggest kidney involvement.

Are urinary casts generally expected in an uncomplicated lower UTI?

No, because the bladder and urethra do not produce renal casts.

What do urinary casts suggest in a patient with UTI symptoms?

That infection or inflammation may involve the kidneys.

What is the key clinical difference between upper and lower UTIs?

Upper UTIs cause localized urinary symptoms plus systemic symptoms and possible flank pain.