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A, FG stands for French Gauge and is the most common measurement used for catheter sizes. Named after the French instrument maker Charriere who lived in the 19th Century. The system measures the diameter of the catheter in millimetres. One Charriere (CH or FG) unit = 1/3mm, so that a 12CH is 4.0mm in diameter. Most catheters are available in even sizes only eg FG12-FG14 etc.
