Which gas cylinder is color-coded yellow in an anesthesia machine (according to the Indian/UK system)?

AIIMS Delhi NO - 2018

Medical & Surgical Nursing

Hard

Appeared in: AIIMS Delhi NO - 2018

Explanation

This question tests the knowledge of medical gas cylinder color codes, but it contains a common error by mixing standards.
In the United States system, Medical Air cylinders are color-coded yellow. This is the likely intended answer for this question.
However, it is critical to note that in the Indian/UK system, Medical Air cylinders are not yellow. They have a grey body with black and white quartered shoulders.
The color yellow in the Indian/UK system is reserved for pipeline outlets for vacuum/suction, not for a gas cylinder.

Option A: In the Indian/UK system, Oxygen cylinders have a black body with a white shoulder.
Option B: Nitrous oxide cylinders are universally color-coded French blue across Indian, UK, US, and international standards.
Option D: In the Indian/UK system, as well as US and international standards, Carbon Dioxide (CO₂) cylinders are color-coded grey.

Clinical Relevance

Nursing practice connection: Knowing Identification of medical gases based on the standardized color-coding of cylinders used in anesthesia and respiratory therapy helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Patient Safety: Correctly identifying gas cylinders is a critical safety measure. Administering the wrong gas can have catastrophic consequences, including severe hypoxia, organ damage, or death.
Prevention of Errors: Standardized color-coding is part of a multi-layered safety system (which also includes Pin Index Safety System and specific valve connections) to prevent the wrong cylinder from being connected to the anesthesia machine or other equipment.
What if?: If a nurse, mistaking the US standard, searches for a 'yellow' air cylinder in an Indian hospital during an emergency, they would lose critical time and could potentially make a fatal error. This highlights the importance of being trained on local standards.

How to Approach the Question

First, identify the key elements of the question: the item (gas cylinder), the characteristic (color-coded yellow), and the specific context (Indian/UK system).
Recall the standard color codes for medical gases. Recognize that different regions (e.g., US vs. UK/India) have different standards.
Evaluate each option against the specified Indian/UK standard. Oxygen is black/white. Nitrous oxide is blue. CO2 is grey. Medical air is grey with a black/white shoulder.
Notice that none of the gases in the Indian/UK system use a yellow cylinder. This indicates a potential flaw in the question.
Consider common points of confusion. The association of 'yellow' with 'Medical Air' comes from the US standard.
Conclude that 'Medical air' is the most likely intended answer for this flawed question, and be prepared to explain the discrepancy between the US and Indian/UK systems.

Concept Tested & Keywords

Concept Tested: Identification of medical gases based on the standardized color-coding of cylinders used in anesthesia and respiratory therapy.
Stem keywords: gas cylinder, color-coded yellow, anesthesia machine, Indian/UK system
Lead-in keywords: Which

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E6 Nursing Fundamentals Taylor p. 1120-1122