Gauge is pronounced 'gage'. The largest commonly available cannula is gauge 18 or 20.

You must choose a cannula with the appropriate size of needle for the required purpose. The size is referred to as the gauge of the cannula, and each size is given a number – the larger the number, the bigger the cannula.

Why do you think you should choose a large gauge cannula if you are giving IV fluid therapy to a pregnant woman who is haemorrhaging?