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Calculations + Compounding > Calculations to Memorize > Flashcards

Calculations to Memorize Flashcards

1
Q

1 tsp = ? mL

A

5 mL

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2
Q

1tbsp = ? mL

A

15 mL

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3
Q

1 fl oz = ? mL

A

29.57 mL

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4
Q

1 cup = ? oz

A

8 oz

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5
Q

1 pint = ? cup = ? oz

A

2 cups, 16 oz

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6
Q

1 pint = ? mL

A

473 mL

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7
Q

1 quart = ? pint = ? oz

A

2 pints, 32 oz

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8
Q

1 quart = ? mL

A

946 mL

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9
Q

1 gal = ? quart = ? mL

A

4 quarts, 3,785 mL

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10
Q

1 kg = ? lbs

A

2.2 lbs

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11
Q

1 oz = ? grams

A

28.4 g

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12
Q

1 gr = ? mg

A

64.8 mg

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13
Q

1 lb = ? grams

A

484 g

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14
Q

mEq = ? mmol

A

mmol x valence
**depends if they are monovalent or divalent ions
Na+ = 1
Ca+ = 2

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15
Q

1 in = ? cm

A

2.54 cm

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16
Q

Specific gravity

A

weight of substance / volume of equal water (g/mL)

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17
Q

Osmolarity

A

[wt of substance (g/L)/ MW (g/mol)] x (# of particles) x (1000)

mOsmol/L

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18
Q

E value

A

E = (58.5)(i)/ (MW)(1.8)

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19
Q

moles

A

g/MW

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20
Q

MW

A

g/mol

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21
Q

mEq equation if you have mg

A

(mg/MW) x valence

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22
Q

Dextrose = ? kcal/g

A

3.4 kcal/g

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23
Q

Amino acid = ? kcal/g

A

4 kcal/g

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24
Q

ILE 10% = ? kcal/g

A

1.1 kcal/mL

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25
Q

Maintenance fluids (>20 kg)

A

1,500 mL + (20 mL)(weight - 20 kg)

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26
Q

Total Energy Expenditure (TEE)

A

BEE x activty factor x stress factor

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27
Q

Nitrogen (g)

A

protein intake (g) / 6.25

28
Q

Correct Ca
(Albumin < 3.5)
**not needed with ionized Ca

A

Ca measured + (4 - Alb)(0.8)

29
Q

BMI

A

weight (kg) / (meters)^2

30
Q

IBW

A

male = 50 + 2.3 (inches)
female 45.5 + 2.3 (inches)

*use IBW when dosing theophylline, aminophylline, levothyroxine, and acyclovir

31
Q

ABG

A

pH/pCO2/pO2/HCO3/O2 Sat
pH (7.35-7.45)
pCO2 (35-45) = acid
HCO3 (22-26) = base

32
Q

Anion Gap

A

Na - HCO3 - Cl

33
Q

pH formula

A

pKa + log[base/acid]

34
Q

ANC

A

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

35
Q

Celcius

A

(F - 32) / 1.8

36
Q

Relative Risk

A

(risk in treatment) / (risk in control)

risk = (# with unfav event)/ (total # in group)

37
Q

Relative Risk Reduction

A

(% risk in control - % risk in treatment) / (% risk in control)

38
Q

Absolute Risk Reduction

A

% risk in control - % risk in treatment

39
Q

NNT

A

1 / ARR(decimal)

40
Q

Odds Ratio

A

AD/CB

41
Q

Hazard Ratio

A

Hazard rate (treatment)/
Hazard rate (control)

42
Q

ICR (regular insulin)

A

450 / daily insulin
*grams of carbs covered by 1 unit of insulin

43
Q

ICR (rapid insulin)

A

500 / daily insulin
*grams of carbs covered by 1 unit of insulin

44
Q

Correction Factor (regular insulin)

A

1500 / total insulin
*correction of BG done by 1 unit of insulin

45
Q

Correction Factor (rapid insulin)

A

1800 / total insulin
*correction of BG done by 1 unit of insulin

46
Q

LDL calc

A

TC - HDL - (TG/5)

*TG must < 400

47
Q

Bioavailability (F)

A

F(%) = 100 x (AUC po/AUC iv) x (DOSE iv / DOSE po)

48
Q

Vd

A

Amount of drug in body / Concentration of drug in plasma

49
Q

Clearance (Cl)

A

( F x dose ) / AUC
or
ke x Vd

50
Q

ke (elimination rate constant)

A

Cl/Vd
or
0.693/half life

51
Q

t1/2 (half life)

A

0.693/ ke

52
Q

Predicting Drug Concentration

A

C2 = C1 x e^(kt)

53
Q

Loading Dose

A

(desired concentration x Vd) / F

54
Q

MAP

A

2/3 DBP + 1/3 SBP

55
Q

Phenytoin (Total) Correction
*for Alb < 3.5

A

Total phenytoin / [(0.2 x Alb) + 0.1]

56
Q

AdjBW

A

IBW + 0.4(TBW - IBW)
**use when patients are obese

EXCEPT: use IBW when dosing theophylline, aminophylline, levothyroxine, and acyclovir

use TBW with vancomycin, LMWH, and UFH

57
Q

pH

A

pKa + log [base/acid]

58
Q

Odds Ratio

A

(# exposed w toxicity x #NOT exposed w/o toxicity) / (#exposed w/o toxicity x #NOT exposed w toxicity)

59
Q

Incremental Cost Ratio

A

(Cost A - Cost B) / (Effect A - Effect B)

60
Q

Loading Dose

A

Concentration x Vd / F

61
Q

predicting concentration

A

level x e^(-ke x t)

62
Q

% ionization (weak base)

A

100 / (1 + 10^ (pH - pKa))

63
Q

% ionization (weak acid)

A

100 / (1 + 10^ (pKa - pH))

64
Q

E value

A

(58.5 x i) / (MW x 1.8)

65
Q

Bioavailablility (F)

A

100 x (AUCpo/AUCiv) x (DOSEiv/DOSEpo)

OR

serum concentration/ dose given PO

66
Q

Clearance

A

F x Dose / AUC
OR
Rate elimination/ Concentration

Calculations + Compounding (4 decks)

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