calculation conversions & equations Flashcards by ashley wellington

how many mL in 1 oz

29.57 mL

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how many g in 1 oz

28.4 g

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how many oz in 1 pint

16 oz

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how many pints in 1 quart

2 pints

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how many quarts in 1 gal

4 quarts

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how many mL in 1 gal

3785 mL (128 oz)

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how many mg in 1 gr

64.8 mg

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phenytoin correction equation

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

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corrected calcium equation

[(0.4 - albumin) x 0.8] + calcium

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specific gravity equation

g / mL

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osmolarity equation (mOsm/L)

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

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what compounds have a dissociation # of 1

dextrose and mannitol

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what compounds have a dissociation # of 2

KCl, NaCl, Na acetate, MgSO4

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which compound has a dissociation # of 3

CaCl

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which compound has a dissociation # of 4

Na citrate

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isotonicity equation

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

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how to determine ionization number

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

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mol and mmol equations

mol = g/MW & mmol = mg/MW

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mEq equation

mEq = (mg x valence) / MW

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which compounds have a valence of 1

ammonium chloride
KCl
potassium gluconate
sodium acetate
sodium bicarb
NaCl

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which compounds have a valence of 2

calcium carbonate
calcium chloride
ferrous sulfate
lithium carbonate
magnesium sulfate

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equation to determine a patient’s fluid requirements

1500 + [20 x (wt - 20)]

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TEE equation

BEE x activity factor x stress factor

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calorie conversion for carbs in EN

4 kcal/g

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calorie conversion for fats in EN

9 kcal/g

calorie conversion for protein in EN

4 kcal/g

calorie conversion for carbs in PN

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

calorie conversion for protein in PN

4 kcal/g

calorie conversion for fats in PN

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

nitrogen balance equation

protein intake / 6.25

nitrogen ratio

NPC:N

drug nutrient interactions with EN

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

BMI equation

kg/m2

IBW equation

50 or 45.5 + (2.3 x in)

AdjBW equation

IBW + 0.4(TBW - IBW)

what drug conversions require IBW

aminophylline/theophylline acyclovir

what drug conversions require AdjBW

aminoglycosides

what drug conversions require TBW

LMWH, UFH, vancomycin and most drugs

CrCl equation

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

when to use what wt in CrCl

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

what levels correlate with metabolic acidosis

low pH low HCO3

what levels correlate with metabolic alkalosis

high pH high HCO3

what levels correlate with respiratory acidosis

low pH high CO2

what levels correlate with respiratory alkalosis

high pH low CO2

anion gap equation

Na - Cl - HCO3

hendersen hasselbach equation

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

drug ionization in a solution equation

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

ANC equation

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

temperature equations

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

how much elemental calcium is in calcium carbonate

40%

how much elemental calcium is in calcium citrate

21%

how much elemental iron is in the different irons

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

metoprolol IV to PO

1:2.5

furosemide IV to PO

1:2

loop diuretic conversions

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

insulin conversions

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

levothyroxine IV to PO

0.75:1

opioid conversions between drugs

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

how to calculate TDD for insulin

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

insulin to carb ratio for regular insulin

450 / TDD = gC covered by 1 unit

insulin to carb ratio for rapid acting

500 / TDD

correction factor for regular insulin

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

correction factor for rapid acting insulin

1800 / TDD (use to find correction dose)

correction dose for insulin

(BG now - target BG) / CF

friedewald equation

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

MWQ for torsion balance equation

SR / 0.05

BSA calculation

sq rt[(cm x kg) / 3600]

MAP equation

[(2 x DBP) + SBP] / 3