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Gest. Age Weight Tube Size Level Suction Cath. Blade
< 28 wks <1000 gm 2.5 7 cm 5 fr 00
28-34 wks 1000-2000 gm 3.0 8 cm 6 fr 0
35-38 wks 2000-3000 gm 3.5 9 cm 8 fr 1
> 38 wks >3000 gm 4.0 10 cm 8fr 1

Tip to lip distance (6+wt. in kg)  *  Trim OETT at 13cm on an angle


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