Kuncara, D.B., Mariedina, C.T., Betty, Lukito, J.S. and Chrestella, J. 2025. PEMERIKSAAN IMUNOHISTOKIMIA CLAUDIN-4 PADA PREPARAT CELL BLOCK CAIRAN EFUSI PLEURA BERDASARKAN KATEGORI DIAGNOSTIK THE INTERNATIONAL SYSTEM FOR REPORTING SEROUS FLUID CYTOPATHOLOGY: IMMUNOHISTOCHEMICAL EXAMINATION OF CLAUDIN-4 ON CELL BLOCK PREPARATIONS OF PLEURAL EFFUSION FLUIDS BASED ON DIAGNOSTIC CATEGORIES OF THE INTERNATIONAL SYSTEM FOR REPORTING SEROUS FLUID CYTOPATHOLOGY. Ibnu Sina: Jurnal Kedokteran dan Kesehatan - Fakultas Kedokteran Universitas Islam Sumatera Utara. 24, 2 (Jul. 2025), 439-445. DOI:https://doi.org/10.30743/ibnusina.v24i2.746.