Some useful words Abbreviations Dx. diagnosis DDx. differential Diagnosis Px. prognosis Tx. treatment Rx. prescription Hx. history Sx. surgery Bx. biopsy Cx. complication RTx. radiotherapy CTx. chemotherapy Ix. indication CIx. contraindication OD. once a day BID. twice a day TID. thrice a day QID. four times a day AC. Before Meals PC. After meals BT. bed time HS. bed time IM. intramuscular IV. intravenous ID. intradermal SQ. sub cutaneous Mg. milligrams Mcg/ug. micrograms G or Gm. grams 1TSF. Teaspoon = 5 ml 1.Tablespoonful =15ml PO. "per os". by mouth PRN. as needed SOS. if needed