Colour of nitrous oxide (N₂O) cylinder used during anesthesia is-

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2024

Explanation

Medical gas cylinders are universally color-coded to prevent catastrophic errors in gas administration.
The standard international color for Nitrous Oxide (N2O) cylinders is French Blue.
This distinct color allows for immediate visual identification in fast-paced environments like operating rooms and emergency departments.

Why Other Options Were Wrong

Option B: A black cylinder is designated for Nitrogen (N2). It is also used for the body of an Oxygen (O2) cylinder, which has a white shoulder.
Option C: A green cylinder is used for Oxygen (O2) in the United States and some other regions, but this is not the international standard and it is not used for nitrous oxide.
Option D: White is used for the shoulder of an Oxygen (O2) cylinder (which has a black body) under international standards. A cylinder that is entirely white is designated for medical air in some coding systems, or it can indicate the shoulder of a medical air cylinder (which has a black and white quartered body).

Related Visual

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Medical Gas Cylinder Color Coding as background academic context rather than a clinical decision trigger.
Correct identification of medical gas cylinders is a critical patient safety responsibility for nurses. Administering the wrong gas can lead to severe hypoxia, anoxia, and death.
The 'Pin Index Safety System' is a mechanical safeguard that prevents the connection of a cylinder to the wrong gas yoke on an anesthesia machine, but visual confirmation of color and label remains the first line of defense.
Nurses must always verify both the color of the cylinder and the printed label before use. Never rely on color alone, as cylinders may be repainted or mislabeled.

How to Approach the Question

This is a factual recall question testing knowledge of essential safety standards in a clinical environment.
Identify the specific substance in question: Nitrous Oxide (N2O).
Recall the standardized color-coding system for medical gas cylinders.
Associate Nitrous Oxide with its designated color, which is French Blue.
Systematically eliminate the other options by recalling the gases they represent: Black for Nitrogen, Green for Oxygen (in the US), and White for the shoulder of an Oxygen cylinder (international standard).

Concept Tested & Keywords

Concept Tested: Medical Gas Cylinder Color Coding
Stem keywords: Nitrous oxide, N2O, cylinder, anesthesia, colour
Lead-in keywords: BEST, MOST RELEVANT CLUE
Negative lead-in flag: false

Question ID

Qp1wlzTZ1fG2c31vemkn0r

Reference Book

E6 Pharmacology KD Tripathi Essentials 9e Part 2 p. 52-54

E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 4486-4488

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