Deck 6: Safe Dosage Preparation

Question 1

The narcotics drawer contains vials of meperidine (Demerol)labeled 75 mg in 1 mL.The preoperative order reads Demerol 60 mg IM on call.If you use the basic calculation method,what is OH?

A)75 mg
B)75 mL
C)60 mg
D)1 mL

Answer 1

75 mg

Question 2

The ratio and proportion method relies on the .

A)ability to estimate
B)use of conversion factors
C)equality of two ratios
D)equality of two proportions

Answer 2

equality of two ratios

Question 3

In the ratio and proportion method,the ratio between the dose on hand and the known quantity is equal to the ratio between the desired dose and the .

A)unknown dose
B)unknown measure
C)unknown quantity
D)unknown unit

Answer 3

unknown quantity

Question 4

An order calls for 6 mg of melatonin and you have tablets that contain 2 mg of melatonin.If you use the basic method,what is D?

A)total number of capsules
B)2 mg
C)6 mg
D)one tablet

Question 5

The preoperative order reads Demerol 60 mg IM on call.The narcotics drawer contains vials labeled meperidine (Demerol)100 mg/2 mL.How should this be set up in the ratio and proportion method?

A)60 mg : 100 mg = 2 mL : X mL
B)100 mg : 2 mL = 60 mg : X mL
C)X mL : 2 mL = 100 mg : 60 mg
D)2 mL : 60 mg = 100 mg : X mL

Question 6

Dosage calculations require meticulous care and .

A)a working knowledge of derivatives
B)an understanding of statistics
C)the ability to do mathematical proofs
D)a working knowledge of basic arithmetic

Question 7

An order calls for 300 mg of diphenhydramine and you have capsules that contain 75 mg of diphenhydramine.If you use the basic method,what is OH?

A)total number of capsules
B)one capsule
C)300 mg
D)75 mg

Question 8

A trimethoprim/sulfamethoxazole suspension contains 40 mg / 5 mL.The order is for 120 mg.If you use the ratio and proportion method,the formula should be set up as follows: .

A)5 mL : 120 mg : 40 mg : X mL
B)120 mg : 40 mg = 5 mL : X mL
C)40 mg : X mL = 120 mg : 5 mL
D)40 mg : 5 mL = 120 mg : X mL

Question 9

In the basic method formula,D refers to the .

A)available dose
B)dose on hand
C)predicted dose
D)desired dose

Question 10

In the basic method formula,OH refers to the .

A)predicted dose
B)dose that is available
C)observed dose
D)ordered dose

Question 11

When using computational formulas,you should .

A)do the computation in your head if possible
B)be as brief and concise as possible
C)rely on your memory
D)write out and label all parts of the formula

Question 12

When calculating dosages,you should remember that .

A)there is no acceptable margin of error in medication administration
B)the physician must verify the final calculation independently
C)the math involved is complex and requires a high level of aptitude
D)close enough is good enough if there is no alternative

Question 13

The order reads Ampicillin 0.5 g. The unit dose packet reads 250 mg/cap.If you use the basic calculation method,what is D?

A)0.5 g
B).25 g
C)250 mg
D)500 mg

Question 14

In the basic method formula,Q refers to the .

A)conversion factor
B)ratio of the desired to the available dose
C)quantity of the on hand dose
D)quantity of the desired dose

Question 15

An order calls for 800 mg of ibuprofen and you have tablets that contain 200 mg of ibuprofen.If you use the basic method,what is Q?

A)total number of capsules
B)200 mg
C)one tablet
D)800 mg

Question 16

The first step in dosage calculation is to .

A)identify the age of the patient to make pediatric adjustments if needed
B)determine whether an easier dosage is possible
C)write the problem in equation form
D)check to see whether all of the measures are in the same system

Question 17

When calculating doses,what should you do with fractions?

A)Use whatever method the physician orders.
B)Round to one decimal place.
C)The method depends on the specific circumstances.
D)Round to two decimal places.

Question 18

The order calls for one ounce of rehydration fluid per hour.On hand is a solution that contains 200 grams per liter.Your first step should be to .

A)determine whether the ordered amount is reasonable
B)round to one decimal point
C)convert to the same measurement system
D)decide which computation method is most efficient

Question 19

You know that there are 1000 grams in a kilogram.You know that a particular infant weighs 3400 grams.To determine the weight in kg,the ratio and proportion method should be set up as follows: .

A)3400 g : 1 kg = X kg : 1000 g
B)Not enough information has been provided.
C)1000 g : 3400 g = 1 kg : X kg
D)1000 g : 1 kg = 3400 g : X kg

Question 20

You have completed calculations and determined that the dosage of the medication should be three tablets per hour.What should your next step be?

A)Look at the doses that other patients have been given.
B)Ask the doctor whether the dosage is acceptable.
C)Ask yourself whether this dose seems reasonable.
D)Dispense the medication.

Question 21

The phrase "never leave a decimal point naked" refers to .

A)putting a zero in front of a decimal point and writing 0.3 rather than .3
B)using decimals rather than whole numbers and writing 0.3 rather than 300
C)rounding to one decimal place instead of two decimal places
D)putting a decimal point and a zero after a whole number and writing 5.0 rather than 5

Question 22

When using the basic method,you should use the same label for the .

A)quantity of on hand dose,the on hand dose,and the desired dose
B)desired and on hand doses
C)desired dose and the quantity of on hand dose
D)on hand dose and the quantity of on hand dose

Question 23

When using the ratio and proportion method,you should remember that .

A)the terms of the second ratio must be in the same sequence as those in the first ratio
B)multiply the inside terms (means)and then the outside terms (extremes)
C)the ratio on the right contains the known quantities and the ratio on the left includes the unknown quantity
D)either fractions or decimals may be used in the calculation

Question 24

When calculating dosages for children,you should remember that .

A)the physiology of children is virtually the same as that of adults
B)children are essentially miniature adults
C)you can typically give half of the adult dose safely
D)the pediatric dosages in drug inserts are a good reference

Question 25

Evaluation of the appropriateness of dosages for elderly persons should .

A)reflect reimbursement requirements
B)be based on the clinician's experience
C)be done on an individual basis
D)rely on the information in the drug insert