20-18071 Rev A
Recommended Sizes for Clinical Devices
Device Recommended Size
Oropharyngeal Airway (OPA) 3
Nasopharyngeal Airway (NPA) 7
Endotracheal Tube and Laryngoscope Blade 7 to 8.5
i-gel Airway 4
King LTS-D/LT-D 4
Combitube 37 Fr (small adult)
Laryngeal Mask Airway (LMA) 4 or 5
Tracheostomy Tube 8 Fr
Airway Suctioning Rigid Adult Size
Thoracostomy Needle 22 G
Chest Tube 14-28 Fr
IV Catheter 22 G
Urinary Catheter Size 16 Fr
IM Needle 21 G (maximum)
Mask (for ventilation) Laerdal Adult Mask 4 to 5+
Intraosseous (IO) Access Tibial:
BIG Automatic Intraosseous Device, 15 G
EZ-IO, 15 G x 1”, 1.8mm x 25mm
Jamshidi ® Illinois Bone Marrow Aspiration/Intraosseous Infusion Needle.
18 Ga. 9/16” (14mm)-1 ½” (38mm)
Humeral:
BIG Automatic Intraosseous Device, 15 G
EZ-IO, 15 G x 1”, 1.8mm x 25mm or 45mm
Caution
Incorrect use of larger devices can damage the IO bones and/or
internal components. The smaller size is recommended.