The Effect of Variations of Serum Examination Time Lapse on Electrolyte Levels of Potassium and Chloride: Pengaruh Variasi Selang Waktu Pemeriksaan Serum Terhadap Kadar Elektrolit Kalium dan Klorida. medicra. 2022;5(2):119-123. doi:10.21070/medicra.v5i2.1639