1 ounce is equal to?

Appeared in: HPSSC Staff Nurse - 2021

Explanation

In medical practice, 1 fluid ounce (oz) is considered equivalent to 30 milliliters (mL).
This is a standard conversion used for calculating medication dosages and measuring fluid intake and output.
The precise conversion is 1 fluid ounce is approximately 29.57 mL, but this is universally rounded to 30 mL for practical clinical use.
This conversion is foundational for ensuring accurate administration of liquid medications prescribed in household units.

Option A: 15 mL is the standard equivalent for 1 tablespoon (tbsp), which is half of a fluid ounce.
Option B: 25 mL is not a standard equivalent for any common household measure used in medication administration.
Option D: 40 mL is approximately 1.35 fluid ounces, which is significantly more than 1 ounce.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Medication Calculation: Unit Conversion as background academic context rather than a clinical decision trigger.
Accurate conversion between household and metric units is a fundamental competency for safe medication administration, preventing potential over- or under-dosing.
A key nursing intervention is patient education: nurses must instruct patients and caregivers to use standardized measuring devices like oral syringes or medication cups, as household spoons vary widely in size and can lead to significant dosing errors.
What if? If a medication order is for a potent drug in a pediatric patient where precision is critical, a nurse should clarify if the dose was calculated using 30 mL/oz or a more precise factor. However, for most situations, 30 mL is the accepted standard.

How to Approach the Question

This is a factual recall question that tests foundational knowledge for medication calculations.
First, identify the two units in the question: the household measure 'ounce' and the metric measure 'milliliter (ml)'.
Next, recall the standard conversion factor used in all healthcare settings for these units.
The established equivalent is 1 ounce = 30 mL.
Finally, scan the options to find the one that matches this standard conversion.

Concept Tested & Keywords

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

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