PTCE Module 5 - Pharmacy Calculations & Conversions

ss stands for

1/2

I stands for

1

V stands for

5

L stands for

50

C stands for

100

D stands for

500

M stands for

1000

Roman numerals can be repeated up to ___ times. *provide an example

three; CCC = 300

What is the rule of ADDITION with roman numerals?

equal or larger numerals will be in front

What is the rule of SUBTRACTION with roman numerals?

smaller numerals will be in front

1 kg = ___ g

1000 g

1 g = ___ mg

1000 mg

1 mg = ___ mcg

1000 mcg

1 oz = ___ g

28.4 g

1 lb = ___ g

455 g

16 oz = ___ g

455 g

1 kg = ___ lb

2.2 lb

1 L = ___ mL

1000 mL

1 mL = ___ gtts

20 gtts

In pharmacy conversions, ___ gtts (drops) is equivalent to 1 mL, but can ___ between problems.

20; vary

1 fl oz = ___ mL

30 mL

1 pt = ___ fl oz

16 fl oz

1 qt = __ fl oz

32 fl oz

1 gal = ___ qt

4 qt

1 tsp = ___ mL

5

1 tbsp = ___ mL

15

1 tbsp = ___ tsp

3 tsp

What are the boiling and freezing points when using CELSIUS?

100; 0

What are the boiling and freezing points when using FAHRENHEIT?

212; 32

What is the equation for TEMPERATURE conversions?

(9 C) = (5 F) - 160

What is DENSITY?

mass per unit volume; g/mL

What is SPECIFIC GRAVITY?

ratio of a LIQUID's density at a certain temperature when compared to WATER

What is the FORMULA for specific gravity?

specific gravity = density / density of water

Define a SOLVENT / DILUENT

liquid used to dissolve other chemicals

Define a SOLUTE

dissolved chemicals or medications by a solvent

Define a SOLUTION

solvent + solute

Ratio Strength uses ___.

fractions

Percentage Strength uses ___.

percents

What is DAILY DOSE?

amount taken in one day

Q4H means

6 times a day

Q12H means

2 times a day

Q24H means

once a day

What is a DAY SUPPLY?

how long a prescription should last a patient

___ are used by insurance companies to determine how often to pay for medications

day supplies

What is a QUANTITY SUFFICIENT?

Total quantity of a prescription

If a visible quantity sufficient (QS) is on the prescription label, what must be done during compounding by the technician?

calculate the total quantity for the prescription

What is the formula to calculate QUANTITY SUFFICIENT?

day supply * daily dose = quantity sufficient

With children's dosing, you will calculate dosages ___ to size when compared to adults

relative

What is the formula for CLARK's RULE?

[Child's weight (lbs) * Adult Dose (mg)] / 150 lbs

What is the formula for YOUNG's RULE?

[Child's age (years) * Adult dose (mg)] / [Child's age + 12 years]

What is the formula for the BSA METHOD?

[Child's BSA (m^2) * Adult Dose (mg)] / 1.73 m^2

What is the formula for WEIGHT BASED DOSING?

desired dosage (mg) * patient weight (kg)

Flow rate is measured in what two units?

(ml/hr); (gtts/min)

What is the formula for DILUTIONS?

C1 V1 = C2 V2

What are you multiplying in DILUTIONS?

concentration; voluime

What are ALLIGATIONS?

you may not have a prescription strength in stock, so you must combined two different strengths to get the desired prescription strength