Staying with your patient from yesterday, you decide that he needs an indwelling urinary catheter. But what size?

There’s another formula for this, of course. But to make it easier,

Size of IDC = 2 x size ETT

Size of Uncuffed ETT  = (Age/4) + 4

Actually, after calculating what ETT size you need for the child, you get so many more answers:

NGT, IDC size = ETT size x 2

length of ETT to lips = ETT size x 3

ICC size = ETT size x 4