Percentage Error in Pharmacy

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Questions and Answers

What is the correct formula for calculating percentage error?

Quantity desired multiplied by maximum potential error divided by 100
Maximum potential error multiplied by 100 divided by quantity desired (correct)
Quantity desired divided by maximum potential error multiplied by 100
Maximum potential error divided by quantity desired multiplied by 100

Why is it necessary for pharmacists to calculate the percentage error?

To determine the price of a medication
To verify the expiration date of a drug
To compare with other competitors
To ensure the error is within allowable limits (correct)

In order for the formula for percentage error to be valid, what must be true about the error and the quantity desired?

They must be expressed in the same denomination (correct)
They must be expressed in different denominations
They must be derived from the same measurement device
They must both be rounded to the nearest whole number

What is a significant factor that pharmacists must consider when using measuring instruments?

<p>The limitations of the measuring instruments (C)</p> Signup and view all the answers

Flashcards

Percentage Error in Pharmacy

The maximum potential error in a measurement, expressed as a percentage of the desired quantity.

Torsion Prescription Balance

A type of balance used in pharmacies to weigh ingredients, often employing a torsion spring.

Maximum Potential Error

The maximum amount that a measuring device can deviate from the true value. For instance, a scale with a ±4 mg error could be off by up to 4 mg more or less than the actual weight.

Quantity Desired

The amount of a substance that you want to obtain. For example, if the prescription calls for 100 mg of a drug, that's the desired quantity.

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Calculating Percentage Error

A calculation to determine if the error in a measurement is acceptable. It helps ensure the accuracy of medications.

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Study Notes

Percentage Error in Pharmacy

Accurate measurements are crucial in pharmacy.
Pharmacists need to understand instrument limitations.
Torsion prescription balances require percentage error calculation.
Percentage error = (Maximum potential error * 100) / Desired quantity.
Error and desired quantity must use the same units.
For a ±4 mg error in a 100 mg measurement, the percentage error is calculated as follows : (4 mg * 100) / 100 mg = 4%