Nuraeni, M., Sudarmi, L., & Panggabean, G. Y. N. (2026). The Effect of Free Space Variation in 3 mL K₂EDTA Vacuum Tube on the Accuracy of Hematocrit and Red Blood Cell Count Tests. Jurnal Riset Kesehatan, 15(1), 110–117. https://doi.org/10.31983/jrk.v15i1.14641