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Module UBF-06 · Version 1.0

Urinary Crystals without Memorizing Every Shape

Work through how urine pH, morphology, polarization, solubility, and specimen handling narrow a crystal differential, then apply that reasoning to a guided fresh-versus-refrigerated case and a set of look-alikes that require timely review.

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Who this module is for

Clinical laboratory scientists and students performing manual urine sediment microscopy who already read casts and cells (UBF-04, UBF-05) and are extending that skill to crystal identification.

Learning objectives

  • Use urine pH and morphology to narrow a crystal group
  • Apply polarization, solubility, temperature, and focus to separate look-alikes
  • Identify crystals that require timely review or communication under laboratory policy

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

11 sources

  1. 1. Simhadri PK, Rout P, Leslie SW. Urinary Crystals Identification and Analysis. StatPearls Publishing; updated July 27, 2024. https://www.ncbi.nlm.nih.gov/books/NBK606103/

    Source note · peer-reviewed literature

  2. 2. 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. https://pmc.ncbi.nlm.nih.gov/articles/PMC11303840/

    Source note · peer-reviewed literature

  3. 3. Lee AJ, Yoo EH, Bae YC, Jung SB, Jeon CH. Differential identification of urine crystals with morphologic characteristics and solubility test. Journal of Clinical Laboratory Analysis. 2022;36(11):e24707. doi:10.1002/jcla.24707. https://pubmed.ncbi.nlm.nih.gov/36164743/

    Source note · peer-reviewed literature

  4. 4. Daudon M, Frochot V. Crystalluria. Clinical Chemistry and Laboratory Medicine. 2015;53(Suppl 2):s1479-s1487. doi:10.1515/cclm-2015-0860. https://pubmed.ncbi.nlm.nih.gov/26509782/

    Source note · peer-reviewed literature

  5. 5. Spasiano A, Halbritter J, Ferraro PM. Cystinuria. GeneReviews. University of Washington, Seattle; initial posting November 20, 2025. https://www.ncbi.nlm.nih.gov/books/NBK619248/

    Source note · professional society guidance

  6. 6. Centers for Medicare & Medicaid Services. 42 CFR 493.1252, Standard: Test systems, equipment, instruments, reagents, materials, and supplies. https://www.law.cornell.edu/cfr/text/42/493.1252

    Source note · federal regulation

  7. 7. Centers for Medicare & Medicaid Services. 42 CFR 493.1281, Standard: Comparison of test results. https://www.law.cornell.edu/cfr/text/42/493.1281

    Source note · federal regulation

  8. 8. Clinical and Laboratory Standards Institute. PRE05: Processes for the Collection of Urine Specimens, 1st ed. 2024. https://clsi.org/shop/standards/pre05/

    Source note · consensus standard

  9. 9. College of American Pathologists. Urinalysis Checklist, URN.22400 Urine Preservation (Phase II). CAP Accreditation Program, 12.09.2025 edition.

    Source note · accreditation standard

  10. 10. College of American Pathologists. Urinalysis Checklist, URN.30800 Morphologic Observation Evaluation (Phase II). CAP Accreditation Program, 12.09.2025 edition.

    Source note · accreditation standard

  11. 11. College of American Pathologists. Urinalysis Checklist, URN.30750 Reference Materials (Phase I). CAP Accreditation Program, 12.09.2025 edition.

    Source note · accreditation standard