Compounding II Flashcards
Equipment used for HDs should be
dedicated to HD and sanitized after use
Calibration of equipment
Equipment must be calibrated regularly to confirm accuracy
Metal spatulas should not be used with
metal ions
When measuring volume, select a device
that has a capacity equal to or slightly larger than the amount being measured to get the most accurate measurement
Measurements should be made in the
metric system
Graduated cylinder
Same diameter from the top to the bottom, provides more accurate measurements
Conical cylinders or beakers
Have wide mouths that make it easier to stir mixtures with a glass stirring rod.
The wider the mouth, the lower the accuracy
A graduated cylinder should not be used to measure volumes
less than 20% the graduates capacity
Parenteral syringes
hypodermic syringes
Syringes are most accurate for
measuring small volumes.
Especially useful for viscous liquids
If a patient requires a very accurate dose, should use a syringe
Luer locks
Make secure, leak free connections between syringes, catheters, and IV lines
Injection (hypodermic) syringes come with
cannulas (needles) attached
Choosing the correct syringe size
Do not use the exact syringe size needed. Select the closest syringe size above the one needed.
Pipettes
Thin plastic or glass tubes used to measure small volumes
Volumetric pipette
Draws up a set volume only, which is the volume that the pipette can hold.
Mohr pipette
Graduated and is used to measure different volumes
Class III Torsion balance
Also called class A balance
-Older type of balance
-Have to calculate minimum weighable quantity (MWQ)
-Have a sensitivity requirement
MWQ=SR/acceptable error rate (0.05 or 5%)
Electronic balance
-Called analytical balance or scale
-Top loading
-Simple to use and has a higher sensitivity
Glass mortars are used for
Liquids and mixing compounds that are oily or can stain
Wedgewood mortars
Have a rough surface and are preferred for grinding dry crystals and hard powders
Porcelain mortars
Have a smooth surface. Preferred for blending powders and pulverizing gummy consistencies
Spatulas
Used to mix and transfer ingredients.
The flat part can be used to flatten and grind down ingredients.
Stainless steel and plastic most common
Ointment slabs
Ingredients are mixed on the compounding/ointment slab
Can also be used to form pulls (pill tiles)
Disposable ointment slabs can be used as a work surface if the water content of the mixture will not cause the paper to tear
Powder sieves
Sifters similar to those used in baking.
Ensure a uniform particle size