a. It is often necessary to express the dose of a fluid medication in common

household unit for self-administration by the client. Ratio and proportion principles can

be used to perform these conversions.

HOUSEHOLD MEASURE

APOTHECARY MEASURE

METRIC MEASURE

2 Tablespoonsful

1 fluid ounce (fl.oz., )

30 milliliters (ml.)

1 Tablespoonful (tbsp.)

1/2 fluid ounce (fl. oz. ,

)

15 milliliters (ml.)

1 teaspoonful (tsp.)

1 fluid dram ( )

5 milliliters (ml.)

1/2 teaspoonful

1/2 fluid dram (

)

2.5 milliliters (ml.)

Table 1-10. Approximate household equivalents.

b. Solve the following problem: A client is to receive 30 milliliters of a particular

antacid preparation. Express this volume in tablespoons.

(1) Step 1. Write the conversion factor as your **IF **ratio:

IF

15 ml

1 Tbsp

(2) Step 2. Write the unknown factor as your **THEN **ratio:

THEN

30 ml

X Tbsp

(3) Step 3. Solve for the unknown as in any ratio and proportion problem.

IF

15 ml THEN

30 ml

1 Tbsp =

X Tbsp

15 X = 1 30

15X

30

=

15

15

X

= 2 Tbsp (answer)

MD0913

1-16

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