Math Basics and conversions

Question 1

What is the formula for calculating IBW for males?

Answer 1

IBW (kg) = 50 + 2.3 × (inches over 5 ft)

IBW stands for Ideal Body Weight.

Question 2

What is the formula for calculating IBW for females?

Answer 2

IBW (kg) = 45.5 + 2.3 × (inches over 5 ft)

IBW stands for Ideal Body Weight.

Question 3

How is Adjusted Body Weight (AdjBW) calculated?

Answer 3

AdjBW = IBW + 0.4 × (TBW − IBW)

TBW stands for Total Body Weight.

Question 4

What is the formula for Creatinine Clearance (CrCl) using the Cockcroft-Gault equation?

Answer 4

CrCl = (140 − age) × weight (kg) / (72 × SCr) × (0.85 if female)

SCr stands for Serum Creatinine.

Question 5

What does the formula Ke = Cl / Vd represent?

Answer 5

Ke is the elimination rate constant, Cl is clearance, and Vd is volume of distribution.

Question 6

What is the half-life (t½) formula?

Answer 6

t½ = 0.693 / ke

Question 7

How do you calculate Loading Dose (LD)?

Answer 7

LD = (Desired conc × Vd) / F

F is bioavailability.

Question 8

What is the formula for Maintenance Dose (MD)?

Answer 8

MD = (Desired conc × Cl × τ) / F

τ is the dosing interval.

Question 9

How is bioavailability (F) expressed in percentage?

Answer 9

F (%) = (AUC oral / AUC IV) × (Dose IV / Dose oral) × 100

AUC stands for Area Under the Curve.

Question 10

What is the formula for calculating flow rate in IV fluids?

Answer 10

Flow (mL/hr) = Total volume (mL) / time (hr)

Question 11

How do you convert flow rate to drops per minute (gtt/min)?

Answer 11

gtt/min = (mL/hr × drop factor) / 60

Question 12

What is the formula for % weight/volume (% w/v)?

Answer 12

% w/v = g / 100 mL

Question 13

How is osmolarity calculated?

Answer 13

Osmolarity (mOsmol/L) = (g / LMW) × particles × 1000 / MWg/L × particles × 1000

LMW is the molecular weight.

Question 14

What is the formula for calculating milliequivalents (mEq)?

Answer 14

mEq = mg × valence / MW

Question 15

How do you calculate milliosmoles (mOsm)?

Answer 15

mOsm = mmol × # of particles

Question 16

What is the formula for corrected calcium (Ca²⁺)?

Answer 16

Corrected Ca²⁺ = Ca + 0.8 × (4 − albumin)

Question 17

How is Absolute Neutrophil Count (ANC) calculated?

Answer 17

ANC = WBC × (/100)

Question 18

What is the conversion for 1 kg in pounds?

Answer 18

1 kg = 2.2 lb

Question 19

How many grams are in 1 ounce?

Answer 19

1 oz = 28.4 g

Question 20

What is the conversion for 1 pound in grams?

Answer 20

1 lb = 454 g

Question 21

How much is 1 teaspoon in milliliters?

Answer 21

1 tsp = 5 mL

Question 22

What is the equivalent of 1 tablespoon in milliliters?

Answer 22

1 tbsp = 15 mL

Question 23

How many milligrams are in 1 grain?

Answer 23

1 grain = 65 mg

Question 24

What is the formula to convert Fahrenheit to Celsius?

Answer 24

°C = (°F − 32) × 5/9

Question 25

What is the formula to convert Celsius to Fahrenheit?

Answer 25

°F = (°C × 1.8) + 32

Question 26

How many kilocalories are in 1 gram of dextrose (parenteral)?

Answer 26

Dextrose (parenteral) = 3.4 kcal/g

Question 27

How many kilocalories are in 1 gram of amino acids?

Answer 27

Amino acids = 4 kcal/g

Question 28

What is the caloric value of IV lipids (20%) per mL?

Answer 28

Lipids IV (20%) = 2 kcal/mL

Question 29

What is the method used for mixing concentrations called?

Answer 29

Alligation method

Question 30

How is ratio strength expressed?

Answer 30

Ratio strength: 1:x = 100/x %

Question 31

How is Bioavailability (F) Calculated?

Answer 31

F(%)=100×(AUCoral/AUCIV)×(Doseoral/DoseIV)