Fig. 1. Images of urine sediments for external quality assessment. (A) CUI-20-01 calcium oxalate crystals (original magnification, ×400). (B) CUI-20-02 broad cast (arrow; original magnification, ×400). (C) CUI-20-03 renal tubular epithelial cells (original magnification, ×400). (D) CUI-20-04 epithelial cell cast (arrow; original magnification, ×400).

Lab Med Qual Assur 2022;44:1~9 https://doi.org/10.15263/jlmqa.2022.44.1.1

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