Q: What size ET tube for a neonate?

<28 weeks GA: 2.5 mm. 28–33 weeks: 3.0 mm. 34–37 weeks: 3.5 mm. ≥38 weeks: 3.5–4.0 mm. Pick the larger size if the infant is at the upper end of the range or if longer-term ventilation is expected.

Q: How do you confirm ET tube placement?

Bilateral equal breath sounds, symmetric chest rise, sustained color change on a CO2 detector, improvement in heart rate and saturations, and a chest X-ray showing the tip 1–2 cm above the carina (around T1–T2).

Question 1

What is the NRP rule for ETT depth in neonates?

Accepted Answer

Insertion depth at the lip (cm) = 6 + weight in kg. A 1 kg infant intubates to ~7 cm at the lip; a 3 kg infant to ~9 cm. This is a starting estimate — always confirm with auscultation, CO2 detection, and chest X-ray.

Question 2

What size ET tube for a neonate?

Accepted Answer

<28 weeks GA: 2.5 mm. 28–33 weeks: 3.0 mm. 34–37 weeks: 3.5 mm. ≥38 weeks: 3.5–4.0 mm. Pick the larger size if the infant is at the upper end of the range or if longer-term ventilation is expected.

Question 3

How do you confirm ET tube placement?

Accepted Answer

Bilateral equal breath sounds, symmetric chest rise, sustained color change on a CO2 detector, improvement in heart rate and saturations, and a chest X-ray showing the tip 1–2 cm above the carina (around T1–T2).

ETT Depth Calculator

Calculate ETT Depth (NRP rule)

NRP depth rule

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ETT size by gestational age

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