Respiratory Therapist how-to
How to Draw an Arterial Blood Gas
ABGs give precise information on oxygenation, ventilation and acid-base balance.
ABGs give precise information on oxygenation, ventilation and acid-base balance. In short: verify; perform; clean, then complete the remaining steps below.
Step by step
Verify the order and identify the patient with two identifiers.
Perform a modified Allen test before a radial puncture, per policy.
Clean the site and stabilize the wrist with slight extension.
Insert the needle at a 30 to 45 degree angle until blood fills the syringe.
Withdraw, apply firm pressure for at least five minutes and remove air from the sample.
Label the sample, analyze it promptly and report results.
Safety reminders for respiratory therapists
- Wear PPE, including N95 respirators, for airborne infections
- Follow oxygen fire safety: no open flames or sparks
- Check alarms and backup equipment on every ventilator
- Use safe lifting and repositioning techniques
Key terms
ABG · SpO2 · FiO2 · Tidal volume · PEEP · Mechanical ventilation: see the full respiratory therapist glossary.