Which vein is preferred for Arterial Blood Gas (ABG) sampling?

Appeared in: AIIMS CRE, SNO-2024

Explanation

The question is flawed; ABGs are drawn from arteries. Assuming it meant 'venous blood draw', the median cubital vein is correct.
The median cubital vein is the preferred site for routine venipuncture because it is large, superficial, and well-anchored.
This location minimizes patient discomfort and reduces the risk of complications like nerve damage or accidental arterial puncture.

Option A: The saphenous vein, located in the leg, is not a primary site for routine venipuncture due to an increased risk of thrombophlebitis and DVT.
Option C: The jugular vein is a central vein in the neck. Accessing it is an advanced procedure for central line placement, not for routine blood draws.
Option D: The femoral vein in the groin is a large, deep, central vein. It is not used for routine sampling due to a high risk of infection and thrombosis.

Visual 1: Diagram: Anatomy of the antecubital fossa, showing the median cubital, cephalic, and basilic veins.
Visual 2: Chart: Comparison table of Arterial vs. Venous blood sampling sites, purposes, and risks.
Visual 3: Illustration: Step-by-step process of performing a venipuncture on the median cubital vein.

Clinical Relevance

Nursing practice connection: Knowing Site selection for blood sampling helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Understanding the correct site for different types of blood draws is fundamental to patient safety and obtaining accurate diagnostic results.
Choosing the wrong site can lead to complications such as hematoma, nerve damage, infection, or thrombosis, and can cause unnecessary pain for the patient.
A nurse must always question an order that seems incorrect, such as 'ABG from a vein'. Clarifying with the provider is a critical patient safety intervention.

How to Approach the Question

First, analyze the question stem for key terms: 'Arterial Blood Gas (ABG)' and 'vein'.
Recognize the immediate contradiction: ABGs are from arteries, but the question asks for a vein.
Evaluate the options. All listed options (Saphenous, Median cubital, Jugular, Femoral) are indeed veins.
Conclude that the question likely has an error and is asking for the preferred site for a routine venous blood draw.
Based on this corrected premise, recall the standard sites for venipuncture. The median cubital vein is the primary choice.
Eliminate the other options based on their typical uses (central lines, emergency access) and associated risks for routine procedures.

Concept Tested & Keywords

Concept Tested: Site selection for blood sampling
Stem keywords: Arterial Blood Gas, ABG sampling, preferred vein
Lead-in keywords: Which
Clinical cues: The question incorrectly pairs an arterial procedure (ABG) with venous options, indicating a likely error in the question's premise.

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E6 Anatomy Grays 43e Vol 2 Part 1 p. 456-458

Practise the full AIIMS CRE, SNO-2024

Attempt every question from this paper in a timed mock, then review the full solution for each one.