Urine Casts: Knowledge Check

Vastian Learning

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Continuing Education Credits

P.A.C.E.® Contact Hours: hour(s)

Florida Board of Clinical Laboratory Science CE Credit Hours

: hour(s)

(based on 10 customer ratings)

Objectives

  • Define the major types of urinary casts and the conditions under which they form.
  • Integrate urine cast findings with other laboratory and clinical data to formulate a preliminary renal assessment.

Course Outline

  • Summary of Urine Casts
    • Table: Urinary Cast Summary
    • Match each cast to its corresponding description.
  • Case Studies
    • A 62-year-old patient is admitted after a prolonged episode of hypotension following cardiac arrest. The patient's creatinine rises from 0.9 to 4.2 mg/dL over 48 hours. Urinalysis shows:Specific gravity: 1.010 Protein: 2+ Microscopic: numerous granular casts, several renal tubular epithelial (RTE) castsWhich diagnosis best explains these findings?
    • A 28-year-old patient presents with tea-colored urine and facial swelling after a recent streptococcal infection. Urinalysis shows: Protein: 3+ Blood: 3+ Microscopy: dysmorphic RBCs, RBC casts What is the most likely diagnosis?
    • A 36-year-old woman presents with fever, flank pain, and dysuria. Urinalysis shows: Leukocyte esterase: positive Nitrite: positive Microscopy: WBC casts What condition do the findings support?
    • A 47-year-old patient presents with edema, frothy urine, and lab results showing: Serum albumin: 2.0 g/dL Urine protein: >3.5 g/day Microscopy: fatty casts, oval fat bodies, and cholesterol crystals with Maltese cross appearanceWhat condition best explains these findings?
    • A 71-year-old patient with long-standing hypertension presents with declining renal function. Labs reveal: Creatinine: 6.3 mg/dL eGFR: 8 mL/min Urine microscopy: broad waxy casts What do these findings indicate?
    • A 54-year-old male has been on high-dose aminoglycosides for 10 days. He develops rising creatinine and oliguria. Urinalysis shows: Specific gravity: low Microscopy: numerous RTE cells and RTE casts What is the most likely mechanism?
    • A healthy 24-year-old athlete presents for a routine physical. He ran 12 miles earlier in the day. Urinalysis shows: Trace protein Few hyaline casts No hematuria No WBCs What is the correct interpretation?

Additional Information

This is a mini course designed to enhance learning and reinforce existing knowledge. It does not provide continuing education (CE) credit. The purpose of this course is to support ongoing professional development and review.