Case Histories 1 - De Anza College
Case Histories 3
A 45-year-old man has been a paraplegic since being involved in a motorcycle accident 20 years ago. He has a history of recurrent urinary tract infections as a result of infection from an indwelling catheter. He now has severe back pain, with fever, shills, and vomiting. He has been exposed to “the flu” and seeks medical attention. A midstream urine specimen is collected for examination and culture. The following routine urinalysis results were obtained:
Physical appearance:
Color yellow
Transparency cloudy
Chemical screening:
pH 6.5
Specific gravity 1.010
Protein (reagent strip) 100 mg/dL
Protein (SSA) 2+
Blood moderate
Nitrite negative
Leukocyte esterase positive
Glucose negative
Ketones negative
Bilirubin negative
Urobilinogen normal
Microscopic examination:
RBC 2-5 per hpf
WBC 10-25 per hpf, clumps of white cells seen
Casts 5-10 cellular casts per lpf
Bacteria moderate rods
1. List the abnormal findings.
2. In this case, the proteinuria is probably due to which of the following?
a. Glomerular damage
b. Lower urinary tract disorders
c. Prerenal disorders
d. Tubular (or interstitial) damage
3. Concerning the positive reagent strip test for leukocyte esterase and the negative nitrite in this case, which of the following statements is correct?
a. The leukocyte esterase test is probably a false-positive reaction
b. The negative nitrite reaction is probably due to insensitivity of the test or lack of sufficient incubation of urine in the bladder
c. The positive leukocyte esterase reaction indicates that an upper urinary tract infection is present.
d. The presence of a bacterial infection is ruled out because of the negative nitrite test.
4. Concerning the positive reagent strip test for blood and the relatively low level of red blood cells seen in the urine sediment of this patient, which of the following statements is correct?
a. The presence of hematuria is not consistent with the disease exhibited by this patient.
b. The presence of protein is probably interfering with the chemical test for blood.
c. The reagent strip test is extremely sensitive and consistent with the microscopic findings.
d. The reagent strip test is probably falsely positive because of the presence of ascorbic acid.
5. The presence of white blood cells, bacteria, and cellular casts in this urine specimen indicate which of the following?
a. A urinary tract infection located within the kidney
b. A urinary tract infection located in the bladder
c. An inflammatory condition of the urinary tract
d. The presence of a kidney stone
6. In this case, the cells present in the casts were probably derived from which of the following?
a. Epithelial cells
b. Lymphocytes
c. Neutrophils
d. Red blood cells
7. Which of the following conditions is exhibited by this patient?
a. Acute cystitis
b. Acute drug-induced interstitial nephritis
c. Acute glomerulonephritis
d. Acute pyelonephritis
e. Nephrotic syndrome
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