Which action do we have to do before ABG Sampling?

Appeared in: SGPGI Nursing Officer-2022

Explanation

The primary action before ABG sampling is ensuring the syringe is prepared with an anticoagulant to prevent the sample from clotting.
Heparin is the standard anticoagulant used. It can be prepared by rinsing a plain syringe with liquid heparin or by using a pre-heparinized ABG syringe kit.
Without heparin, the arterial blood sample will clot quickly, making it impossible to analyze and requiring a repeat procedure for the patient.

Option A: Normal saline is an isotonic solution used for cleaning wounds or flushing IV lines, but it is not an antiseptic. It does not kill microorganisms.
Option C: This is a factually incorrect statement. Air bubbles are a common source of pre-analytical error and significantly alter blood gas values, leading to misdiagnosis and improper treatment.
Option D: Hydrogen peroxide is a cytotoxic agent that can damage tissue and is not recommended for routine skin antisepsis before venipuncture or arterial puncture.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pre-procedure steps for Arterial Blood Gas (ABG) sampling as background academic context rather than a clinical decision trigger.
Accurate ABG results are vital for diagnosing and managing life-threatening acid-base imbalances and respiratory failure. Incorrect sample handling can lead to flawed data and inappropriate clinical interventions.
Nurses are often responsible for collecting ABG samples or assisting with the procedure, making knowledge of the correct technique essential for patient safety and quality of care.
What if the patient is on anticoagulant therapy (e.g., warfarin, heparin)? The nurse must apply firm pressure to the puncture site for a longer duration, typically 10-15 minutes instead of the usual 5, to prevent hematoma formation and ensure hemostasis.

How to Approach the Question

First, identify the core topic of the question, which is the correct procedure for ABG sampling.
The question asks for an action to be performed before the sample is taken. This directs you to think about preparation steps.
Evaluate each option based on standard nursing protocols for invasive procedures and specimen collection.
Recall that arterial blood clots quickly. This points to the need for an anticoagulant, making 'Syringe rinsing with heparin' the most logical preparatory step.
Eliminate the other options: 'Site clean with normal saline' and 'Site clean with H2O2' are incorrect methods of skin antisepsis. 'No effect sample with air bubbling' is a dangerously false statement.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 79-81

E6 Nursing Vital Signs p. 52-54

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