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conversions and equations
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1 teaspoon to fluid ounce
is equivalent to 1/6 of a fluid ounce
1 teaspoon to mL
is equivalent to 4.92892 mL
1 tablespoon to fluid ounce
is equivalent to 1/2 of a fluid ounce
Calculate number of dose
Number of dose = (total quantity)/ (Size of dose)
1 tablespoon to mL
is equivalent to approximately 15 mL.
1 pint to mL
is equivalent to approximately 473 mL.
1 gram to mg
is equivalent to 1000 mg.
0.020 g to mg
is equivalent to 20 mg.
ug to mg
is equivalent to 0.001 mg.
50 ug to mg
is equivalent to 0.05 mg.
Calculate size of dose
Size of dose = (Total quantity) / (Number of doses)
Compliance rate
% compliance rate = ((number of days supply) /(number of days since last rx refill)) x 100
Density equation
Density = (mass) / (volume)
Specific gravity
Specific gravity = (weight of substance) / (weight of equal volume of water)
52.78 mL in g
52.78 g
Drug needed
prescription
Factor
LWQ / Drug needed
Drug weighed
Drug needed x factor
Total Mixture
Drug weighed + Dilluent weighed
Diluent weighed
Total Mixture - Drug weighed
Aliquot portion
1/ factor
Percent error
(Error x 100%) / (Quantity desired)
1 lb to grams
454 grams
1 ounce to gram
28.35 grams
1 kg to lb
2.2 pounds
1 inch to cm
2.54 centimeters
Iron required mg
Body weight (lb) x 0.3 x [100 - ((Hb (g/dL) x 100) / 14.8 g/dL)]
Crockcraft-Gault equaltion
CrCl = ((140 - patient’s age in years) x pt. wt. kg) / 72 x serum creatine in mg/dL
Difference in CrCl equation for female
multiple by 0.85
Calculate pH for acid
pH = pka + log (salt/acid)
Calculate pH for base
pH = pKa + log (base/salt)
Calculate pH change with pKb
pH = pkw - pKb + log (base/salt)