Warmup - Continue working on the problem from Tuesday- TPN. Objectives- The student will be able to perform calculations pertinent to PhT . Calculations. Ratio and Proportions.
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Objectives- The student will be able to perform calculations pertinent to PhT.
2. Set-up the proportion equation.
xmL / 1 min = 80 mL / 60 min
3. Establish the x equation.
x ml = 1 min times 80 ml/60 min
4. Factor and solve.
Xml = 1 times 80 mL/ 60 min = 1.33
5. Express solution in correct units.
The flow rate would be 1.33 ml/minute.
Remember that IV Flow Rate calculations may need to be calculated by gtts/min, gtts/ml, or may need to solve the amount of time before an IV bag will go empty (like in TPN).
Strength of Lower strength Component (L)
H-P = Relative amount needed to prepare P
Desired strength of Product (P)
Strength of higher strength Component (H)
P-L = Relative amount of H needed to prepare P
What are the relative amounts of 70% alcohol and 40% alcohol needed to prepare 60% alcohol? (However in this example, since the value of P is higher than that of L, you will be subtracting L from P. You cannot have a negative number.
Strength of Lower strength Component (L)= 40
= 10 parts needed of L
Desired strength of Product (P)= 60
Strength of higher strength Component (H)= 70
= 20 parts needed of H
=10 parts needed of L
Desired strength of product (P): 60
=20 parts needed of H
300 mL P x 20 mL H/30 mL P = 200 mL H
300 mL P x 10 mL L/30 mL P = 100 mL L
So when 200 mL of 70% alcohol are mixed with 100 mL of 40% alcohol, the resulting solution is 300 mL of 60% alcohol.
The volume of the diluent D) + the powder volume (PV)
FV = D +PV
Most doses in U.S.P (United States Pharmacopoeia) and other drug references are for adults. Usually, drugs that can be taken by children have doses provided by the manufacturer.
However, when a dose is not provided
for, the adult dose must be lowered.
Weight of child/150lb x adult dose = dose for child
150 lbs is considered an avg adult. However, this is not very precise because there are many other factors. Like. . . Ht, Wt, Age, Condition, and on and on.
Body Surface Area Formula
Child BSA times adult dose/average adult bsa = child dose
Body Surface Area (BSA) is based on height and weight. It is always given in square meters (m2). 1.73 m2 is used as an average for bsa for adults.
Nomogram can calculate the bsa of an adult or child.
Usual and Customary Price U&C- The lowest price charged if a patient pays cash, on that day, for that drug.
U&C is determined at the corporate level.
The computers are usually programmed to figure this out.