NAPLEX Formulas Flashcards
tsp (t) = ____ mL
5
tbsp (T) = ____ mL
15
1 fl oz = ____ mL (approx); ____ mL (actual)
30; 29.57
1 cup = ____ oz
8
1 pint = ____ oz
16
1 quart = ____ pints
2
1 gallon = ____ quarts
4
1 kg = ____ pounds (lbs)
2.2
1 oz = ____ grams (g)
28.4
1 lb = ____ g
454
1 grain = ____ mg (approx.); ____ mg (actual)
65; 64.8
mEq to mmol is ___:___ for monovalent ions
1:1
mEq to mmol is ___:___ for divalent ions
1 : 0.5
1 inch (in) = ____ centimeters (cm)
2.54
1 meter (m) = ____ cm
100
% w/v
X g / 100 mL
% w/w
X g / 100 g
% v/v
X mL / 100 mL
Percentage strength
100 / Ratio strength
Ratio strength
100 / Percentage strength
Parts per million (PPM) → Percentage strength: Move the decimal ____ 4 places
left
Percentage strength → Parts per million (PPM): Move the decimal right ____ places
4
Specific Gravity (SG)
weight of substance (g) / weight of equal volume of water (g) or g / mL
Alligation
Use proportions to calculate amount of high % and/or low % required
mOsmol/L
Wt of substance (g/L) / MW (g/mole) x (# particles) X 1,000
Isotonicity (E value)
58.5(i) / [(MW of drug)(1.8)]
mols
g / MW
mmols
mg / MW
mEq
(mg x valence) / MW or mmols x valence
Corrected Calcium for Albumin < 3.5
Ca(reported) + [(4.0 - albumin) x 0.8]
Dextrose Monohydrate = ____ kcal / gram
3.4
Amino Acid Solutions = ____ kcal / gram
4
Injectable Lipid Emulsions (ILE) 10% = ____ kcal / mL
1.1
ILE 20% = ____ kcal / mL
2
ILE 30% = ____ kcal / mL
3
Determining fluid needs when weight > 20kg
1,500 mL + (20 mL)(Weight in kg - 20)
*can estimate using 30-40mL/kg/day
Enteral carbs, protein = ____ kcal/gram
4
Enteral fat = ____ kcal/gram
9
Total Energy Expenditure (TEE)
BEE x activity factor x stress factor
Nitrogen (g) from protein
protein intake (g) / 6.25
Cockcroft-Gault Equation
CrCl (mL/min) = [140 - age] / [72 x SCr] x weight (kg) (x 0.85 if female)
Body Mass Index (kg/m²) formula
weight (kg) / height (m)² = [weight (lb) / height (inches)²] X 703
IBW (males)
50 kg + (2.3 kg) (# of in. over 5 feet)
IBW (females)
45.5 kg + (2.3 kg) (# of in. over 5 feet)
AdjBW
IBW + 0.4 (TBW - IBW)
Which body weight do you use for underweight patients
Total body weight (TBW)
Which body weight do you use for normal weight/obese patients for acyclovir, aminophylline, levothyroxine, theophylline?
ideal body weight
Which body weight do you use for obese patients for aminoglycosides?
AdjBW
Acidosis pH < ______
7.35
Alkalosis pH < _______
7.45
Respiratory alkalosis pCO2 < ______
35
Respiratory acidosis pCO2 > ______
45
Metabolic alkalosis HCO3 > ______
26
Metabolic acidosis HCO3 < _______
22
1 cup = ___ mL
240 (approx.)
1 pint = ___ mL
480 (approx.)
1 quart = ___mL
960 (approx.)
1 gal = ___ mL
3850 (approx.)
Dehydration
BUN:SCr > 20:1
Pt is dehydrated!
Anion gap (AG)
Na - Cl - HCO3
Weak acid =
pH = pKa + log[salt/acid]
Weak base =
pH = pKa + log[base/salt]
Weak acid % ionization =
100/[1+100^(pKa-pH)]
Weak base % ionization =
100/[1+100^(pH-pKa)]
Absolute neutrophil count (ANC) =
WBC [ (%segs + % bands)/100]
Cells/mm^3
Fahrenheit to Celsius 
Cel it’s = (degree F - 32)/1.8
Celsius to Fahrenheit
F = (C x 1.8) +32
Time to burn (TTB)=
TTB, ( with sunscreen and min) = SPF x TTB(without sunscreen)
LDL =
TC - HDL - TG*/5
- do not use if TG > 400
Minimum weighable quantity (MWQ)
Sensitivity requirement/acceptable error (usually 0.05)
Sensitivity requirement is usually 6mg
BSA =
Square root[Ht(cm) x Wt(kg) / 3600]
Units = m^2
MAP
[(2 x diastolic pressure) + systolic pressure] /3
Total phenytoin correction for albumin <3.5
Total phenytoin measured/(0.2 X albumin) +0.1
1L = ___ dL
10
So move 1 decimal to right if L to dL
