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Catheters

Choosing

Length: Male 380 mm, Female 220 mm, paed 250 mm.
Diameter: Charrière (Ch) or French guage (Fg).
1 Ch = 0.33 mm.
12–16 Ch: clear dilute urine.
16–18 Ch: urine + debris.
>18 ch: haematuria + clots.
Normally 12 Ch for a woman, 14 Ch for a man.
Balloon: 10 or 30 ml. Use 10 ml routinely.

Notes

Size of catheter.
Ease of passage.
Residual volume.