In a routine urinalysis of a 43-year-old man with 1-2 hyaline casts per high power field and otherwise normal results, what is the most appropriate next step?

• A. Collect a urine for culture and sensitivity.
• B. Do nothing, since these casts are considered normal.
• C. Refer the patient to a nephrologist.
• D. Schedule the patient for a CT scan.

Answer: (B)

Casts in urine come from tubular secretions and can signal kidney tubule involvement, but not all casts mean disease. Hyaline casts are the most common type and are composed of Tamm-Horsfall protein. They are nonspecific and can be seen in healthy people, especially with concentrated urine, dehydration, exercise, or mild stress. A small number of hyaline casts in an otherwise normal urinalysis usually does not indicate pathology.

In this scenario, the patient has only 1–2 hyaline casts per high-power field and otherwise normal results. That pattern fits within what is typically considered a benign finding, so no immediate workup is needed. The appropriate course is to continue routine care and monitor; test or imaging would be reserved for the development of additional abnormalities (such as proteinuria, hematuria, cellular casts) or new symptoms.