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NAPLEX Review > Formulas and Calculations > Flashcards

Formulas and Calculations Flashcards

1
Q

1 tsp = ___ mL

A

5

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2
Q

1 oz = ___ ml

A

29.57

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3
Q

1 cup = ___ oz

A

8

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4
Q

1 cup = ___ mL

A

236.56

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5
Q

1 pint = ___ fluid oz

A

16

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6
Q

1 pint = ___ mL

A

473

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7
Q

1 quart = ___ pints

A

2

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8
Q

1 quart = ___ mL

A

946

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9
Q

1 gallon = ___ quarts

A

4

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10
Q

1 gallon = ___ mL

A

3785

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11
Q

1 kg = ___ pounds

A

2.2

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12
Q

1 oz = ___ grams

A

28.4

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13
Q

1 lb = ___ grams

A

454

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14
Q

1 grain = ___ mg

A

64.8

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15
Q

1 inch = ___ cm

A

2.54

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16
Q

1 meter = ___ cm

A

100

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17
Q

Calculation for percentage strength w/v

A

100 mL

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18
Q

Calculation for percentage strength w/w

A

100 grams

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19
Q

Calculation for percentage strength v/v

A

100 mL

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20
Q

Percentage strength =

A

Ratio strength

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21
Q

Ratio strength =

A

percentage strength

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22
Q

How to change PPM to percentage strenght?

10 ppm

A

Move the decimal left 4 places

0.001%

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23
Q

Specific gravity equation

A

weight of equal volume of water (grams or mL)

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24
Q

Q1 x C1 =

A

Q2 x C2

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25
Q

Osmolarity calculation

A

mOsmol/L = (weight of substance (g/L)/MW (g/mol)) x # of particles x 1,000

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26
Q

Isotonicity equation

A

E = [58.5(i)]/[MW of drug x 1.8]

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27
Q

mol calculation

A

MW

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28
Q

mEq calculation

A

mg x valence/MW
OR
mmol x valence

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29
Q

How many calories is a gram of enteral carbs?

A

4 kcal

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30
Q

How many calories is a gram of enteral protein?

A

4 kcal

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31
Q

How many calories is a gram of enteral fat?

A

9 kcal

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32
Q

How many calories is a gram of parenteral dextrose monohydrate?

A

3.4 kcal

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33
Q

How many calories is a gram of parenteral amino acid solutions

A

4 kcal

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34
Q

How many calories is a mL of parenteral intravenous lipid emulsion 10%

A

1.1 kcal

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35
Q

How many calories is a mL of parenteral intravenous lipid emulsion 20%

A

2 kcal

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36
Q

How many calories is a mL of parenteral intravenous lipid emulsion 30%

A

3 kcal

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37
Q

Calculation for determining fluid needs

A

1500 mL + [20mL x (weight in kg-20)]

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38
Q

Corrected calcium calculation

A

Serum calcium + [(4.0-albumin) x 0.8]

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39
Q

Total energy expenditure (TEE) calculation

A

Basal energy expenditure (BEE) x activity factor x stress factor

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40
Q

Grams of nitrogen from protein calculation

A

protein intake (grams)

  1. 25
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41
Q

BMI calculation

A

height (m)^2

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42
Q

Anion gap calculation

A

Na - Cl - HCO3

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43
Q

pH calculation for weak acid

A

pH = pKa + log (salt/acid)

44
Q

pH calculation for weak base

A

pH = pKa + log (base/salt)

45
Q

Absolute neutrophil count (ANC) calculation

A

WBC x [(%segs + %bands)/100]

46
Q

Celsius calculation

A

(F-32)/1.8

47
Q

Fahrenheit calculation

A

Cx1.8 + 32

48
Q

Time to burn with sunscreen calculation

A

SPF x Time to burn without sunscreen

49
Q

Risk calculation

A

Total number of subjects in a group

50
Q

Relative risk (RR) calculation

A

Risk in control group

51
Q

Relative risk reduction (RRR) calculation

A

%risk in the control group

52
Q

Absolute risk reduction (ARR) calculation

A

%risk in control group - % risk in treatment group

53
Q

Number needed to treat/harm calculation

A

Absolute risk reduction (decimal)

54
Q

Hazard ratio calculation

A

Hazard rate in control group

55
Q

Sensitivity calculation

A

total # with condition

56
Q

Specificity calculation

A

total with no condition

57
Q

Total daily dose of insulin calculation

A

0.5 units/kg/day X TBW
1/2 basal and 1/2 rapid OR
2/3 NPH and 1/3 rapid
Split rapid among meals

58
Q

Insulin to carbohydrate ratio calculation

Rapid-acting insulin

A

500/total daily dose of insulin = grams of carbs covered by 1 unit rapid acting insulin

59
Q

Insulin to carbohydrate ratio calculation

Regular insulin

A

450/total daily dose of insulin = grams of carbs covered by 1 unit regular insulin

60
Q

Correction factor for rapid acting insulin

A

1800/total daily dose of insulin = correction factor for 1 unit of rapid-acting insulin

61
Q

Correction factor for regular insulin

A

1500/total daily dose of insulin = correction factor for 1 unit of regular insulin

62
Q

Correction dose calculation

A

correction factor

63
Q

LDL calculation

A

TC - HDL - (TG/5)

*Do not use if TG>400

64
Q

Minimum weighable quantity (MWQ)

A

sensitivity requirement

  1. 05
65
Q

BSA calculation

A

Square root of:
Ht (cm) x Wt (kg)
———–
3600

66
Q

Bioavailability calculation (F%)

A

100 x (AUC extravascular/AUC intravascular) x (dose intravenous.dose extravascular)

67
Q

Volume distribution (Vd) calculation

A

concentration of drug in plasm

68
Q

Clearance calculation (Cl)

A

(F x dose)/AUC
OR
Vd x ke

69
Q

Elimination rate constant (ke) calculation

A

Cl/Vd

70
Q

Half life calculation

A

t1/2 = 0.693/ke

71
Q

Loading dose calculation

A

F

72
Q

Corrected Phenytoin concentration

A

Total phenytoin measured

(0. 2 x albumin)+0.1

73
Q

KCl 10% = _____ meq/___mL

A

20mEq/15mL

74
Q

Calcium carbonate = _____% elemental calcium

A

40%

75
Q

Calcium citrate = _____% elemental calcium

A

21%

76
Q

Aminophylline to Theophylline calculation

A

ATM

Amino to Theo, Multiply by 0.8

77
Q

Furosemide IV:PO conversion

A

IV:PO
1:2

78
Q

Metoprolol IV:PO conversion

A

IV:PO
1:2.5

79
Q

Ferrous sulfate = _____% elemental iron

A

20%

80
Q

Levothyroxine IV:PO conversion

A

IV:PO

0.75:1

81
Q

How many mmol = mEq of monovalent and divalent ions?

A

1 mEq = 1mmol of monovalent ions

1 mEq = 0.5mmol of divalent ions

82
Q

How many mL in 1 tablespoon?

A

15 mL

83
Q

What is the order of operations

A 
PEMDAS
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction
84
Q

How many particles does the following compound dissociate into?
Dextrose

A

1

85
Q

How many particles does the following compound dissociate into?
Mannitol

A

1

86
Q 
How many particles does the following compound dissociate into?
Potassium chloride (KCl)
A

2

87
Q 
How many particles does the following compound dissociate into?
Sodium chloride (NaCl)
A

2

88
Q 
How many particles does the following compound dissociate into?
Sodium acetate (NaC2H3O2)
A

2

89
Q 
How many particles does the following compound dissociate into?
Magnesium sulfate (MgSO4)
A

2

90
Q 
How many particles does the following compound dissociate into?
Calcium Chloride (CaCl2)
A

3

91
Q 
How many particles does the following compound dissociate into?
Sodium citrate (Na3C6H5O7)
A

4

92
Q 
What is the dissociation factor for compounds that dissociated into \_\_\_ ions
1
2
3
4
5
A 
1 = 1
2 = 1.8
3 = 2.6
4 = 3.4
5 = 4.2

Start with 1 then add 0.8 (indicates 80% dissociated)

93
Q 
What is the valence of 
Ammonium Chloride (NH4Cl)
A

1

94
Q 
What is the valence of 
Potassium Chloride (KCl)
A

1

95
Q 
What is the valence of 
Potassium gluconate (KC6H11O7)
A

1

96
Q 
What is the valence of 
Sodium acetate (NaC2H3O2)
A

1

97
Q 
What is the valence of 
Sodium bicarbonate (NaHCO3)
A

1

98
Q 
What is the valence of 
Sodium Chloride (NaCl)
A

1

99
Q 
What is the valence of 
Calcium Carbonate (CaCO3)
A

2

100
Q 
What is the valence of 
Calcium chloride (CaCl20
A

2

101
Q 
What is the valence of 
Ferrous Sulfate (FeSO4)
A

2

102
Q 
What is the valence of 
Lithium carbonate (Li2CO3)
A

2

103
Q 
What is the valence of 
Magnesium Sulfate (MgSO4)
A

2

104
Q

What is an appropriate estimate of BEE for patients?

A

15-25 kcal/kg/day

Actual BEE calculation is super long

105
Q

What are the protein requirements for
Ambulatory, non-hospitalized
Hospitalized or malnourished

A

Amb: 0.8-1 g/kg/d
Hosp: 1.2-2 g/kg/d

106
Q

What parenteral nutrition is measured in g/mL and what is measured in kcal/mL?

A

Protein and carbs - g/mL

Lipids - kcal/mL

107
Q

What are the component of an arterial blood gas?

A

pH/pCO2/pO2/HCO3/O2 Sat

NAPLEX Review (79 decks)

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