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What is the formula for calculating a dosage?
(D / H) x Q where...
D = dosage desired (what prescriber has ordered)
H = dosage strength available (what's on HAND)
Q = the quantity or the unit of measure that contains the dosage that is available (i.e. tablets, capsules, milliliters)
Remember that all should be in same units (i.e. mg, mcg)
Rounding rule for liquid med administration from a 3 mL syringe
NEVER round to a whole unit
If math calculation does not work out evenly to the tenths place, then carry division to the hundredths place (two decimal places) and round to the nearest tenth
Rounding rule for liquid med administration from a 1 mL (tuberculin) syringe
The 1 mL (tuberculin syringe) is calibrated in 0.01 mL increments
If the math calculation does not work out evenly to the hundredths place, then the division is carried to the thousandths place and rounded to the nearest hundredths place
Rounding rule for liquid med administration from a large syringe (5, 10, 12 mL)
Large syringes (5, 10, 12 mL) are calibrated in 0.2 mL increments. Dosages are also expressed to the nearest tenth
Dosages administered should be measured in milliliters, and the answers should be labeled accordingly
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