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NAPLEX > calculation conversions & equations > Flashcards

calculation conversions & equations Flashcards

1
Q

how many mL in 1 oz

A

29.57 mL

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2
Q

how many g in 1 oz

A

28.4 g

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3
Q

how many oz in 1 pint

A

16 oz

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4
Q

how many pints in 1 quart

A

2 pints

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5
Q

how many quarts in 1 gal

A

4 quarts

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6
Q

how many mL in 1 gal

A

3785 mL (128 oz)

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7
Q

how many mg in 1 gr

A

64.8 mg

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8
Q

phenytoin correction equation

A

total level / [(0.2 x albumin) + 0.1]

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9
Q

corrected calcium equation

A

[(0.4 - albumin) x 0.8] + calcium

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10
Q

specific gravity equation

A

g / mL

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11
Q

osmolarity equation (mOsm/L)

A

[(g/L) / MW] x dissociation # x 1000

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12
Q

what compounds have a dissociation # of 1

A

dextrose and mannitol

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13
Q

what compounds have a dissociation # of 2

A

KCl, NaCl, Na acetate, MgSO4

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14
Q

which compound has a dissociation # of 3

A

CaCl

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15
Q

which compound has a dissociation # of 4

A

Na citrate

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16
Q

isotonicity equation

A

E = (58.5 x isotonicity #) / (MW x 1.8)

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17
Q

how to determine ionization number

A

if dissociation # is 1, ionization is 1
each dissociation # adds 0.8 (1.8, 2.6, 3.4, 4.2)

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18
Q

mol and mmol equations

A

mol = g/MW & mmol = mg/MW

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19
Q

mEq equation

A

mEq = (mg x valence) / MW

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20
Q

which compounds have a valence of 1

A

ammonium chloride
KCl
potassium gluconate
sodium acetate
sodium bicarb
NaCl

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21
Q

which compounds have a valence of 2

A

calcium carbonate
calcium chloride
ferrous sulfate
lithium carbonate
magnesium sulfate

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22
Q

equation to determine a patient’s fluid requirements

A

1500 + [20 x (wt - 20)]

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23
Q

TEE equation

A

BEE x activity factor x stress factor

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24
Q

calorie conversion for carbs in EN

A

4 kcal/g

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25
Q

calorie conversion for fats in EN

A

9 kcal/g

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26
Q

calorie conversion for protein in EN

A

4 kcal/g

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27
Q

calorie conversion for carbs in PN

A

3.4 kcal/g for dextrose
4.3 kcal/g for glycerin

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28
Q

calorie conversion for protein in PN

A

4 kcal/g

29
Q

calorie conversion for fats in PN

A

1.1 kcal/mL for 10%
2 kcal/mL for 20%
3 kcal/mL for 3%

30
Q

nitrogen balance equation

A

protein intake / 6.25

31
Q

nitrogen ratio

A

NPC:N

32
Q

drug nutrient interactions with EN

A

warfarin - hold 1 hour before and after
tetracyclines/quinolones/levothyroxine - separate due to chelation
cipro - use IR and crush/mix
phenytoin - separate by 2 hours

33
Q

BMI equation

A

kg/m2

34
Q

IBW equation

A

50 or 45.5 + (2.3 x in)

35
Q

AdjBW equation

A

IBW + 0.4(TBW - IBW)

36
Q

what drug conversions require IBW

A

aminophylline/theophylline
acyclovir

37
Q

what drug conversions require AdjBW

A

aminoglycosides

38
Q

what drug conversions require TBW

A

LMWH, UFH, vancomycin and most drugs

39
Q

CrCl equation

A

[(140 - age) / (72 x SCr)] x wt x 0.85 if female

40
Q

when to use what wt in CrCl

A

if underweight use TBW
if normal weight or BMI <25 use IBW
if BMI >25 use AdjBW

41
Q

what levels correlate with metabolic acidosis

A

low pH
low HCO3

42
Q

what levels correlate with metabolic alkalosis

A

high pH
high HCO3

43
Q

what levels correlate with respiratory acidosis

A

low pH
high CO2

44
Q

what levels correlate with respiratory alkalosis

A

high pH
low CO2

45
Q

anion gap equation

A

Na - Cl - HCO3

46
Q

hendersen hasselbach equation

A

pH = pKa + log[salt / acid] for acid
pH = pKa + log[base / salt] for base OR
pH = (14 - pKb) + log[base / salt]

47
Q

drug ionization in a solution equation

A

% ionization = 100 / [1 + 10^(pKa - pH)] for acid
100 / [1 + 10^(pH - pKa)] for base

48
Q

ANC equation

A

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

49
Q

temperature equations

A

to C: (F - 32) / 1.8
to F: (C x 1.8) + 32

50
Q

how much elemental calcium is in calcium carbonate

A

40%

51
Q

how much elemental calcium is in calcium citrate

A

21%

52
Q

how much elemental iron is in the different irons

A

gluconate 12%
sulfate 20%
sulfate, dried 30%
fumurate 33%
complex 100%

53
Q

metoprolol IV to PO

A

1:2.5

54
Q

furosemide IV to PO

A

1:2

55
Q

loop diuretic conversions

A

furosemide 40 = torsemide 20 = bumetanide 1 = ethacrynic acid 50

56
Q

insulin conversions

A

1:1 EXCEPT
BID NPH to glargine = 80% of NPH dose
toujeo to glargine/detemir = 80% of toujeo dose

57
Q

levothyroxine IV to PO

A

0.75:1

58
Q

opioid conversions between drugs

A

morphine 10:30
hydromorphone 1.5:7.5
oxycodone x:20

59
Q

how to calculate TDD for insulin

A

0.5 units/kg/day
divide by 2 then divide rapid acting among meals

60
Q

insulin to carb ratio for regular insulin

A

450 / TDD = gC covered by 1 unit

61
Q

insulin to carb ratio for rapid acting

A

500 / TDD

62
Q

correction factor for regular insulin

A

1500 / TDD = CF for 1 unit (use to find correction dose)

63
Q

correction factor for rapid acting insulin

A

1800 / TDD (use to find correction dose)

64
Q

correction dose for insulin

A

(BG now - target BG) / CF

65
Q

friedewald equation

A

LDL = TC - HDL - (TG/5)
use only if TG <400

66
Q

MWQ for torsion balance equation

A

SR / 0.05

67
Q

BSA calculation

A

sq rt[(cm x kg) / 3600]

68
Q

MAP equation

A

[(2 x DBP) + SBP] / 3

NAPLEX (7 decks)

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