Diagnosing and treating urinary tract infections is bread-and-butter FNP practice and heavily tested. Practice the cystitis, pyelonephritis, and antibiotic-selection scenarios below with full rationales.
Question 1
A 4-year-old male treated for his first febrile UTI has just completed a 10-day course of cefdinir. He is now afebrile and asymptomatic. The parents ask if a repeat urinalysis is necessary today. Which action is most appropriate?
- A) Order a repeat urinalysis to confirm bacterial clearance.
- B) Advise that a post-treatment urinalysis is not indicated.✓
- C) Schedule a voiding cystourethrogram to check for reflux.
- D) Prescribe prophylactic antibiotics until a culture is negative.
Show rationale
For a pediatric patient who has fully responded to treatment for a first febrile UTI, a routine post-treatment urinalysis or test-of-cure is not recommended by current pediatric guidelines. Option B is correct because it prevents unnecessary testing in an asymptomatic child. While a renal ultrasound is indicated after a first febrile UTI to check for anatomic abnormalities, repeating the urinalysis is not. Option A is incorrect because confirming bacterial clearance is only necessary if symptoms persist or recur. Option C is incorrect because a voiding cystourethrogram is no longer routinely recommended after a first UTI unless the renal ultrasound reveals hydronephrosis or scarring. Option D is incorrect because prophylactic antibiotics are not indicated following a single resolved UTI and contribute to antimicrobial resistance. Clinical resolution is the primary indicator of success.
Question 2
A fifty-year-old female presents with fourteen days of purulent rhinorrhea and unilateral severe maxillary facial pain that has progressively worsened. She has no known medication drug allergies and has not taken any recent antibiotics. Which intervention is most appropriate?
- A) Prescribe a course of oral azithromycin.
- B) Prescribe a course of oral amoxicillin-clavulanate.✓
- C) Prescribe a course of oral levofloxacin.
- D) Prescribe a course of oral trimethoprim-sulfamethoxazole.
Show rationale
The patient meets the diagnostic criteria for acute bacterial rhinosinusitis, given her severe, worsening symptoms lasting longer than ten days. Current clinical guidelines recommend oral amoxicillin-clavulanate as the first-line empiric antibiotic for adults to adequately cover beta-lactamase-producing Haemophilus influenzae and Streptococcus pneumoniae. Azithromycin and trimethoprim-sulfamethoxazole are no longer recommended for empiric therapy due to high rates of pneumococcal resistance. Levofloxacin is a respiratory fluoroquinolone that provides excellent coverage but should be reserved for patients with severe penicillin allergies or those who have failed initial therapy, due to its risk of severe adverse effects like tendon rupture.
Question 3
A young adult reports persistent dysuria and urinary frequency. The urinalysis shows 20 white blood cells per high-power field, but there is no growth on standard urine culture after 48 hours. Which of the following is the most appropriate action?
- A) Prescribe an extended course of oral trimethoprim-sulfamethoxazole.
- B) Request a timed urine collection for total protein.
- C) Reassure the patient that the infection is resolved.
- D) Order nucleic acid amplification testing for Chlamydia trachomatis.✓
Show rationale
The presence of persistent dysuria and urinary frequency with 20 white blood cells per high-power field indicates significant inflammation, but no growth on standard urine culture defines sterile pyuria. In sexually active individuals, sterile pyuria is a classic presentation for sexually transmitted infections like Chlamydia or Gonorrhea. Ordering nucleic acid amplification testing (Option D) is the most appropriate next step to identify the underlying atypical pathogen. Option A is incorrect because extending the course of a standard UTI antibiotic will not effectively treat Chlamydia and ignores the negative culture results. Option B is irrelevant; a timed protein collection evaluates renal parenchymal disease or preeclampsia, not infectious lower tract symptoms. Option C is incorrect because the patient remains highly symptomatic, and the underlying cause of the sterile pyuria must be addressed.
Question 4
A 78-year-old patient with mild vascular dementia presents with a sudden worsening of confusion that developed over the past two days. The caregiver notes the patient has also developed new-onset urinary incontinence but denies any fever or cough. How should the nurse practitioner modify the current plan of care?
- A) Increase the current dosage of the acetylcholinesterase inhibitor.
- B) Order a urinalysis and culture to evaluate for infection.✓
- C) Initiate a trial of memantine for advancing cognitive decline.
- D) Schedule a non-contrast head computed tomography scan immediately.
Show rationale
The patient is experiencing an acute change in cognition, which strongly suggests delirium rather than a natural progression of their underlying dementia. The presence of new-onset urinary incontinence points toward a urinary tract infection as the likely precipitating cause. Option B is the best action because identifying and treating the underlying infection will typically resolve the acute confusion. Option A is incorrect because increasing dementia medications will not treat delirium and may cause adverse effects. Option C is inappropriate because memantine is indicated for moderate-to-severe Alzheimer's disease, not acute delirium or mild vascular dementia. Option D is unnecessary at this stage; while a stroke could cause sudden changes, the lack of focal neurological deficits and the presence of new urinary symptoms make an infectious etiology much more likely and the appropriate first step to evaluate.
Question 5
A 19-year-old female reports a 12-hour history of periumbilical pain migrating to the right lower quadrant. She has profound anorexia, a temperature of 100.8°F, and a negative urine human chorionic gonadotropin test. Which diagnosis is most likely?
- A) Early acute appendicitis✓
- B) Unruptured ectopic pregnancy
- C) Acute right pyelonephritis
- D) Ruptured ovarian follicle
Show rationale
The classic migration of pain from the periumbilical region to the right lower quadrant, combined with anorexia, low-grade fever, and a negative pregnancy test, makes early acute appendicitis the most likely diagnosis. An unruptured ectopic pregnancy (B) is effectively ruled out by the negative human chorionic gonadotropin test. Acute right pyelonephritis (C) typically presents with costovertebral angle tenderness, dysuria, and higher fevers rather than migrating abdominal pain. A ruptured ovarian follicle (D), or mittelschmerz, causes sudden unilateral mid-cycle pain but does not typically cause migrating pain or profound anorexia.
Question 6
A 68-year-old woman reports involuntary urine loss during aerobic exercise and when laughing. She denies any sudden, uncontrollable urges to void. She has a history of hypertension treated with lisinopril. Which subjective finding would most likely exacerbate her specific type of incontinence?
- A) A persistent, dry cough developing over the recent weeks.✓
- B) A high daily intake of caffeinated coffee or black tea.
- C) A recent, significant increase in daily water consumption volume.
- D) A documented history of recurrent lower urinary tract infections.
Show rationale
The patient presents with stress urinary incontinence, characterized by leakage during exertion or laughing. The lisinopril-induced dry cough directly increases intra-abdominal pressure, worsening her stress incontinence. Option A correctly identifies this exacerbating factor. Option B and Option C primarily exacerbate urge incontinence by increasing detrusor stimulation or bladder volume, not stress incontinence. Option D typically presents with urge incontinence, frequency, or dysuria rather than isolated exertional leakage. Asking about the side effects of her antihypertensive medication is a crucial subjective assessment step to identify a reversible contributor to her stress incontinence.
Question 7
A 24-year-old female provides a urine sample to evaluate urinary urgency. The microscopic urinalysis reveals positive leukocyte esterase, negative nitrites, 15 white blood cells per high-power field, and >20 squamous epithelial cells per high-power field. Which action should the clinician take next?
- A) Prescribe a standard empiric antibiotic course.
- B) Order a comprehensive urine culture test.
- C) Perform a targeted pelvic examination now.
- D) Request a new clean-catch urine specimen.✓
Show rationale
The presence of >20 squamous epithelial cells indicates significant vaginal contamination of the sample, rendering the leukocyte esterase and white blood cell counts unreliable for diagnosing a urinary tract infection. Prescribing antibiotics or ordering a culture based on this sample is inappropriate and could lead to misdiagnosis. The clinician must request a new clean-catch urine specimen to accurately assess for infection before considering a pelvic examination.
Question 8
A 55-year-old male with poorly controlled type 2 diabetes presents with frequent episodes of biliary colic. His recent abdominal ultrasound confirms multiple small, mobile gallstones without acute cholecystitis. Which action is most appropriate for this patient?
- A) Refer for prompt surgical consultation due to complication risks.✓
- B) Initiate a strict low-fat diet and delay surgical referral.
- C) Prescribe prophylactic oral antibiotics and recommend a high-fiber diet.
- D) Order an abdominal magnetic resonance imaging to confirm findings.
Show rationale
Diabetic patients with symptomatic gallstones are at a significantly higher risk for severe complications, such as gangrenous cholecystitis or severe infections, compared to the general population. Therefore, a prompt surgical referral is prioritized over prolonged medical management. Option A is correct. Option B is incorrect because delaying surgery in a poorly controlled diabetic with frequent attacks invites emergency complications. Option C is inappropriate; prophylactic antibiotics are not indicated for uncomplicated biliary colic. Option D is unnecessary and wastes resources, as the ultrasound has already confirmed the symptomatic gallstones, making further imaging redundant before surgical consult.
Question 9
A 68-year-old female is stabilized on warfarin for atrial fibrillation with a consistent INR between 2.0 and 3.0. She is newly prescribed trimethoprim-sulfamethoxazole for an uncomplicated urinary tract infection. How should the nurse practitioner manage her anticoagulation plan?
- A) Increase the weekly warfarin dose and check INR in three days.
- B) Maintain the current warfarin dose and check INR in one month.
- C) Decrease the weekly warfarin dose and check INR in three days.✓
- D) Discontinue the warfarin completely and check INR in one full week.
Show rationale
Trimethoprim-sulfamethoxazole is a potent antibiotic that causes significant CYP2C9 inhibition, drastically reducing the metabolism of warfarin. This interaction rapidly elevates the INR and increases the risk of severe bleeding. The standard of care involves a preemptive dose reduction of warfarin (typically by 10 to 25 percent) and rechecking the INR within 3 to 5 days. Option A is incorrect because increasing the dose would exacerbate the bleeding risk. Option B ignores the dangerous drug interaction. Option D is incorrect because completely discontinuing warfarin leaves the patient unprotected against stroke; a dose reduction is the appropriate clinical response.
Question 10
A 19-year-old woman complains of mild periumbilical pain shifting to the right lower quadrant over the past twelve hours. She reports anorexia and low-grade fever but denies any vaginal discharge, dysuria, or irregular bleeding. Her negative urine pregnancy test rules out obstetric complications. On examination, she has localized tenderness at McBurney's point. Which differential diagnosis is most strongly supported by these findings?
- A) Early acute appendicitis✓
- B) Right ovarian torsion
- C) Pelvic inflammatory disease
- D) Ruptured ovarian cyst
Show rationale
The classic migration of pain from the periumbilical region to the right lower quadrant, combined with anorexia and a low-grade fever, strongly points to acute appendicitis. Right ovarian torsion presents with sudden, severe unilateral pain and vomiting, rather than a gradual migratory pain pattern. Pelvic inflammatory disease typically presents with bilateral lower abdominal pain, vaginal discharge, and cervical motion tenderness. A ruptured ovarian cyst causes sudden, sharp unilateral pain, often linked to physical activity, and does not typically cause a gradual onset of migratory pain or systemic symptoms like fever and anorexia.
Question 11
A pregnant female at 16 weeks gestation presents for a follow-up visit. She completed cephalexin 7 days ago for asymptomatic bacteriuria and currently denies dysuria or frequency. Which action is most appropriate?
- A) Reassure the patient and schedule routine prenatal care.
- B) Obtain a urine culture to confirm bacterial eradication.✓
- C) Initiate suppressive daily antibiotic therapy until delivery.
- D) Prescribe a three-day course of oral nitrofurantoin.
Show rationale
Pregnant women are a unique population where a test-of-cure culture is mandatory one week after completing UTI treatment. Due to physiologic changes in pregnancy, untreated or partially treated bacteriuria carries a high risk of progressing to pyelonephritis and causing preterm labor. Option B is correct because confirming bacterial eradication is the standard of care for this population. Option A is incorrect because simply reassuring the patient ignores the guideline-directed need to verify clearance of the bacteria. Option C is incorrect because suppressive daily antibiotics are indicated only for recurrent infections, not after a single resolved episode. Option D is incorrect because prescribing additional antibiotics without a positive culture result is inappropriate and exposes the fetus to unnecessary medication. Always verify clearance in pregnancy to prevent severe maternal and fetal complications.
Question 12
A sexually active female returns to the clinic reporting persistent dysuria 3 days after completing trimethoprim-sulfamethoxazole for a presumed UTI. Her repeat urinalysis shows positive leukocyte esterase, negative nitrites, and no bacteria. Which action is most appropriate?
- A) Perform a pelvic exam and swab for chlamydia.✓
- B) Prescribe a five-day course of oral nitrofurantoin.
- C) Order a CT scan of the abdomen and pelvis.
- D) Advise increased fluid intake and repeat urinalysis.
Show rationale
When a young, sexually active patient presents with persistent dysuria and sterile pyuria—indicated by positive leukocytes but negative nitrites and bacteria—the provider must suspect an alternative etiology such as a sexually transmitted infection. Option A is correct because Chlamydia and Gonorrhea frequently present as urethritis mimicking a UTI, making a pelvic exam and swabbing the most appropriate next step. Option B is incorrect because prescribing another course of UTI-specific antibiotics will not treat the underlying STI and delays proper care. Option C is incorrect because ordering a CT scan is an excessive, high-radiation intervention for uncomplicated sterile pyuria without signs of upper tract involvement. Option D is incorrect because simply advising fluid intake dismisses the likelihood of an active STI that requires targeted antimicrobial therapy to prevent pelvic inflammatory disease.
Question 13
A 62-year-old male presents with acute dysuria, urinary frequency, fever, and deep perineal pain that started yesterday. He appears uncomfortable and reports difficulty sitting down. Which physical examination step is most appropriate for this patient?
- A) Vigorously massage the prostate to obtain fluid for culture.
- B) Perform a gentle digital rectal exam to assess the prostate.✓
- C) Percuss the costovertebral angle to rule out acute pyelonephritis.
- D) Inspect the urethral meatus for purulent or clear discharge.
Show rationale
The patient's presentation of fever, dysuria, and perineal pain is classic for acute bacterial prostatitis. Option B is correct because a gentle digital rectal exam is necessary to assess for a tender, boggy, and warm prostate. Option A is contraindicated; vigorous massage of an acutely infected prostate can precipitate bacteremia. Option C evaluates for pyelonephritis, which typically presents with flank pain rather than perineal pain. Option D is useful for urethritis, which usually presents with penile discharge rather than deep perineal pain and fever.
Question 14
A 72-year-old female with type 2 diabetes presents for routine labs. Her UACR is 45 mg/g. Urinalysis reveals dysuria, positive nitrites, and positive leukocyte esterase.
- A) Initiate an ACE inhibitor medication therapy now.
- B) Treat the urinary infection and repeat UACR.✓
- C) Refer the patient to a local nephrologist.
- D) Diagnose early stage diabetic nephropathy disease process.
Show rationale
A UACR greater than 30 mg/g suggests microalbuminuria, but active urinary tract infections cause transient false positives. The clinician should treat the infection first, then repeat the UACR in 4 to 6 weeks. Options A and D are incorrect because diagnosing diabetic nephropathy or starting an ACE inhibitor requires two elevated UACR results over a 3- to 6-month period in the absence of an active infection. Option C is premature without confirmed, persistent renal disease.
Question 15
A 68-year-old female reports leaking urine when coughing or laughing. She denies dysuria or sudden urges to urinate. She declines surgical intervention and asks for the safest initial treatment to manage her symptoms.
- A) Refer for pelvic floor physical therapy✓
- B) Prescribe daily oral oxybutynin therapy
- C) Prescribe daily oral mirabegron therapy
- D) Refer for outpatient surgical evaluation
Show rationale
This patient presents with classic stress urinary incontinence, triggered by increased intra-abdominal pressure. Pelvic floor physical therapy is the safest and most effective first-line treatment for this condition. Options B and C are incorrect because antimuscarinics and beta-3 agonists target detrusor overactivity seen in urge incontinence, not the sphincter weakness characteristic of stress incontinence. Option D is incorrect because conservative management should always precede surgical evaluation, especially since she explicitly declined surgery. Establishing a patient-centered plan requires prioritizing non-pharmacologic interventions first.
Question 16
A 17-year-old female, 5 years post-menarche, reports cycles every 60 to 90 days. Physical examination reveals a BMI of 32 but no evidence of hirsutism or severe acne. Which finding is required to establish the diagnosis?
- A) Documenting an elevated serum free testosterone laboratory level.✓
- B) Identifying polycystic morphology on a transvaginal pelvic ultrasound.
- C) Demonstrating an elevated luteinizing hormone to gonadotropin ratio.
- D) Confirming severe insulin resistance via fasting glucose testing.
💡 Key Takeaway
Adolescent PCOS diagnosis requires both ovulatory dysfunction and evidence of hyperandrogenism, which can be clinical or biochemical.
Show rationale
In adolescents, diagnosing PCOS requires both ovulatory dysfunction (which this patient has, given her oligomenorrhea 5 years post-menarche) and hyperandrogenism. Because she lacks clinical signs like hirsutism or severe acne, you must demonstrate biochemical hyperandrogenism via elevated serum free or total testosterone, making Option A correct. Option B is incorrect; ultrasound is not recommended for diagnosis within eight years of menarche due to normal physiologic variations in ovarian morphology. Option C is incorrect; an elevated LH-to-FSH ratio is frequently seen in PCOS but is not a recognized diagnostic criterion. Option D is incorrect; while patients with PCOS and obesity often have insulin resistance, metabolic testing is used for risk stratification and management, not to establish the primary diagnosis.
Question 17
A 21-year-old female presents with dysuria and frequency. She reports a severe anaphylactic reaction to penicillin during childhood. The local E. coli resistance to TMP-SMX is 12%. Which of the following is the most appropriate antibiotic prescription?
- A) Amoxicillin-clavulanate 500 mg orally twice daily for five days
- B) Trimethoprim-sulfamethoxazole DS orally twice daily for three days✓
- C) Ciprofloxacin 250 mg orally twice daily for three days
- D) Cephalexin 500 mg orally twice daily for seven days
💡 Key Takeaway
TMP-SMX is a safe first-line UTI treatment for penicillin-allergic patients when local resistance is below 20 percent.
Show rationale
Choosing the right antibiotic here requires balancing local resistance data with a severe allergy history. A severe anaphylactic reaction to penicillin completely rules out amoxicillin-clavulanate and makes cephalexin a risky choice due to the potential for cross-reactivity. Because the local resistance rate to TMP-SMX is 12 percent, which is well below the 20 percent cutoff, it remains an excellent first-line option. You should hold off on prescribing ciprofloxacin, as fluoroquinolones are reserved for situations where absolutely no first-line agents can be safely used.
Question 18
A 25-year-old male with perennial allergic rhinitis uses fluticasone nasal spray daily with perfect technique. Despite adherence, he continues to complain of bothersome watery eyes and sneezing.
- A) Switch the fluticasone to a daily oral systemic corticosteroid.
- B) Discontinue the fluticasone and start an intranasal decongestant spray.
- C) Increase the fluticasone frequency to three times every day.
- D) Add a daily oral second-generation antihistamine to the regimen.✓
💡 Key Takeaway
Step-up therapy for allergic rhinitis uncontrolled by intranasal corticosteroids involves adding an oral or intranasal antihistamine.
Show rationale
When daily intranasal corticosteroid monotherapy is insufficient to control symptoms like sneezing and ocular irritation, adding an oral second-generation antihistamine or an intranasal antihistamine is the appropriate step-up therapy. Switching to systemic corticosteroids is inappropriate and carries significant risks for routine allergic rhinitis management. Discontinuing the steroid for an intranasal decongestant risks rebound congestion and fails to treat the allergic cascade. Increasing fluticasone beyond the maximum recommended daily dosing increases the risk of epistaxis and septal perforation.
Question 19
A 26-year-old male's scrotal ultrasound reveals a hypoechoic, hypervascular solid mass within the right testicular parenchyma. He denies any recent trauma, pain, or dysuria.
- A) Order serum alpha-fetoprotein, beta-hCG, and lactate dehydrogenase✓
- B) Prescribe a four-week course of empiric oral antibiotics
- C) Schedule a repeat scrotal ultrasound in six months
- D) Perform a percutaneous core needle biopsy of the mass
💡 Key Takeaway
Solid intra-testicular masses require serum tumor marker evaluation prior to definitive urologic surgical management.
Show rationale
A hypoechoic, hypervascular solid intra-testicular mass in a young adult is highly suspicious for testicular cancer. The next appropriate diagnostic step is to order serum tumor markers, including alpha-fetoprotein, beta-hCG, and lactate dehydrogenase, prior to urologic referral. Prescribing empiric antibiotics (Option B) is incorrect because the mass is solid and painless, not infectious. Scheduling a repeat ultrasound in six months (Option C) dangerously delays the diagnosis and treatment of a potential malignancy. Performing a percutaneous core needle biopsy (Option D) is strictly contraindicated due to the high risk of seeding tumor cells into the scrotal lymphatic drainage from an intra-testicular mass.
Question 20
A 22-year-old non-pregnant female presents with two days of dysuria and frequency. She reports no vaginal discharge or fever. She has no significant medical history and takes no daily medications. Which diagnostic action is most appropriate?
- A) Order a comprehensive urine culture test.
- B) Perform a point-of-care urine dipstick.✓
- C) Obtain a nucleic acid amplification test.
- D) Order a microscopic urinalysis laboratory test.
💡 Key Takeaway
Uncomplicated cystitis in healthy non-pregnant women can be diagnosed clinically or supported by a simple urine dipstick.
Show rationale
For a healthy young adult with classic symptoms of uncomplicated cystitis and no vaginal symptoms, a point-of-care urine dipstick is sufficient to support the diagnosis. A urine culture is not routinely indicated for initial uncomplicated episodes. A nucleic acid amplification test or microscopic urinalysis adds unnecessary cost and delay when the clinical picture and dipstick strongly align.
