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Fig. 1.

Images of urine sediments (arrow) for external quality assessment. (A) CUI-18-01 calcium oxalate crystal (original magnification×400). (B) CUI-18-02 cellular cast (original magnification×200). (C) CUI-18-03 cholesterol crystal (original magnification×400). (D) CUI-18-04 spermatozoa (original magnification×400).

J Lab Med Qual Assur 2019;41:75~81 https://doi.org/10.15263/jlmqa.2019.41.2.75
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