One ounce is equal to

Appeared in: VSSC Nursing Officer - 2021

Explanation

In medical and nursing practice, one fluid ounce (oz) is standardized as being equal to 30 milliliters (mL).
This conversion is fundamental for calculating medication dosages, patient fluid intake, and output.
Although the precise conversion is 1 fl oz = 29.57 mL, it is rounded to 30 mL for safety, consistency, and ease of use in clinical settings.

Option A: 60 mL is the equivalent of 2 fluid ounces, which is double the amount specified in the question.
Option C: 15 mL is equivalent to 0.5 (half) a fluid ounce. It is also the standard measurement for one tablespoon.
Option D: 45 mL is the equivalent of 1.5 fluid ounces.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Unit Conversion: Fluid Ounces to Milliliters as background academic context rather than a clinical decision trigger.
Accurate fluid conversion is critical for patient safety in medication administration. A dosage error due to incorrect conversion can lead to under-dosing (ineffective treatment) or overdose (toxicity).
Nurses use this conversion daily to document fluid intake and output (I&O), which is essential for managing patients with conditions like heart failure, kidney disease, and dehydration.
What if? If a patient is on a strict fluid restriction of 1200 mL per day and they drink an 8 oz glass of water, the nurse must accurately calculate this as 240 mL (8 oz x 30 mL/oz) to subtract from the patient's daily allowance.

How to Approach the Question

First, identify the core of the question: it's asking for a standard unit conversion used in healthcare (ounces to milliliters).
Recognize this as a factual recall question. Access your memory of fundamental nursing measurements and conversions.
Recall the key conversion factor: 1 ounce = 30 mL.
Scan the given options to find the one that matches this established fact.
Select the matching option (30 ml) and mentally confirm that the other options represent incorrect conversions (e.g., 15 ml is a tablespoon, 60 ml is two ounces).

Concept Tested & Keywords

QusqGmiXXQN08F_yQvK7CS

E6 Nursing Fundamentals Potter Perry 12e Part 3 pp. 140-142, 141-143

E6 Nursing Fundamentals Taylor p. 1059-1061

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