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Module UBF-08 · Version 1.0

Using Casts in Clinical Correlation

A cast forms inside a renal tubule, so a verified cast localizes material to the nephron before any diagnosis is possible. Hyaline, cellular, granular, waxy, and fatty casts are correlated with chemistry pad results, cell counts, and renal function to show how RBC casts, marked hematuria, high albuminuria, and reduced eGFR can cohere with an intrarenal bleeding pattern. The correlation process ranks interpretations, identifies the most useful confirmatory observation, and leads to a defensible next action under local escalation policy.

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Who this module is for

Clinical laboratory scientists and students performing manual urine sediment microscopy who need to correlate cast findings with the rest of the urinalysis and basic renal chemistry.

Learning objectives

  • Connect cellular and noncellular cast patterns with the nephron process each pattern supports
  • Use associated cells, protein, blood, and renal chemistry to judge whether a cast pattern is internally coherent
  • Recognize nonspecific casts, concentration and exercise effects, degeneration change, and mixed patterns that limit interpretation
  • Choose a bounded, policy-based laboratory action for a cast finding without converting morphology into a diagnosis

How completion works

Mark every required section done and answer every knowledge check in those sections correctly. The final save completes the module automatically.

Sources

10 sources

  1. 1. Gaggar P, Raju SB. Diagnostic Utility of Urine Microscopy in Kidney Diseases. Indian Journal of Nephrology. 2024;34(3):213-221. doi:10.25259/ijn_362_23.

    Source note · peer-reviewed literature

  2. 2. Saha MK, et al. Glomerular Hematuria and the Utility of Urine Microscopy: A Review. American Journal of Kidney Diseases. 2022;79(3):399-407. doi:10.1053/j.ajkd.2021.07.013.

    Source note · peer-reviewed literature

  3. 3. Cavanaugh C, Perazella MA. Urine Sediment Examination in the Diagnosis and Management of Kidney Disease: Core Curriculum 2019. American Journal of Kidney Diseases. 2019;73(2):258-272. doi:10.1053/j.ajkd.2018.07.012.

    Source note · peer-reviewed literature

  4. 4. Dolscheid-Pommerich RC, Klarmann-Schulz U, Conrad R, Stoffel-Wagner B, Zur B. Evaluation of the appropriate time period between sampling and analyzing for automated urinalysis. Biochemia Medica. 2016;26(1):82-89. doi:10.11613/BM.2016.008.

    Source note · peer-reviewed literature

  5. 5. Jo M, Ahn HJ, Son HS, et al. Preanalytical requirements of urinalysis. Biochemia Medica. 2014;24(1):89-104. doi:10.11613/BM.2014.011.

    Source note · peer-reviewed literature

  6. 6. Kidney Disease: Improving Global Outcomes. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney International. 2024;105(Suppl 4S):S117-S314.

    Source note · professional society guidance

  7. 7. College of American Pathologists. Urinalysis Checklist, URN.30425 Microscopic Exam Correlation (Phase II). CAP Accreditation Program, 12.09.2025 edition.

    Source note · accreditation standard

  8. 8. 42 CFR 493.1251, Standard: Procedure manual.

    Source note · federal regulation

  9. 9. 42 CFR 493.1291, Standard: Test report.

    Source note · federal regulation

  10. 10. Centers for Medicare & Medicaid Services. State Operations Manual, Appendix C: Survey Procedures and Interpretive Guidelines for Laboratories and Laboratory Services.

    Source note · federal guidance