Calculations to Memorize Flashcards
(66 cards)
1
Q
1 tsp = ? mL
A
5 mL
2
Q
1tbsp = ? mL
A
15 mL
3
Q
1 fl oz = ? mL
A
29.57 mL
4
Q
1 cup = ? oz
A
8 oz
5
Q
1 pint = ? cup = ? oz
A
2 cups, 16 oz
6
Q
1 pint = ? mL
A
473 mL
7
Q
1 quart = ? pint = ? oz
A
2 pints, 32 oz
8
Q
1 quart = ? mL
A
946 mL
9
Q
1 gal = ? quart = ? mL
A
4 quarts, 3,785 mL
10
Q
1 kg = ? lbs
A
2.2 lbs
11
Q
1 oz = ? grams
A
28.4 g
12
Q
1 gr = ? mg
A
64.8 mg
13
Q
1 lb = ? grams
A
484 g
14
Q
mEq = ? mmol
A
mmol x valence
**depends if they are monovalent or divalent ions
Na+ = 1
Ca+ = 2
15
Q
1 in = ? cm
A
2.54 cm
16
Q
Specific gravity
A
weight of substance / volume of equal water (g/mL)
17
Q
Osmolarity
A
[wt of substance (g/L)/ MW (g/mol)] x (# of particles) x (1000)
mOsmol/L
18
Q
E value
A
E = (58.5)(i)/ (MW)(1.8)
19
Q
moles
A
g/MW
20
Q
MW
A
g/mol
21
Q
mEq equation if you have mg
A
(mg/MW) x valence
22
Q
Dextrose = ? kcal/g
A
3.4 kcal/g
23
Q
Amino acid = ? kcal/g
A
4 kcal/g
24
Q
ILE 10% = ? kcal/g
A
1.1 kcal/mL
25
Maintenance fluids (>20 kg)
1,500 mL + (20 mL)(weight - 20 kg)
26
Total Energy Expenditure (TEE)
BEE x activty factor x stress factor
27
Nitrogen (g)
protein intake (g) / 6.25
28
Correct Ca
(Albumin < 3.5)
**not needed with ionized Ca
Ca measured + (4 - Alb)(0.8)
29
BMI
weight (kg) / (meters)^2
30
IBW
male = 50 + 2.3 (inches)
female 45.5 + 2.3 (inches)
*use IBW when dosing theophylline, aminophylline, levothyroxine, and acyclovir
31
ABG
pH/pCO2/pO2/HCO3/O2 Sat
pH (7.35-7.45)
pCO2 (35-45) = acid
HCO3 (22-26) = base
32
Anion Gap
Na - HCO3 - Cl
33
pH formula
pKa + log[base/acid]
34
ANC
WBC x [(%segs + %bands)/100]
35
Celcius
(F - 32) / 1.8
36
Relative Risk
(risk in treatment) / (risk in control)
risk = (# with unfav event)/ (total # in group)
37
Relative Risk Reduction
(% risk in control - % risk in treatment) / (% risk in control)
38
Absolute Risk Reduction
% risk in control - % risk in treatment
39
NNT
1 / ARR(decimal)
40
Odds Ratio
AD/CB
41
Hazard Ratio
Hazard rate (treatment)/
Hazard rate (control)
42
ICR (regular insulin)
450 / daily insulin
*grams of carbs covered by 1 unit of insulin
43
ICR (rapid insulin)
500 / daily insulin
*grams of carbs covered by 1 unit of insulin
44
Correction Factor (regular insulin)
1500 / total insulin
*correction of BG done by 1 unit of insulin
45
Correction Factor (rapid insulin)
1800 / total insulin
*correction of BG done by 1 unit of insulin
46
LDL calc
TC - HDL - (TG/5)
*TG must < 400
47
Bioavailability (F)
F(%) = 100 x (AUC po/AUC iv) x (DOSE iv / DOSE po)
48
Vd
Amount of drug in body / Concentration of drug in plasma
49
Clearance (Cl)
( F x dose ) / AUC
or
ke x Vd
50
ke (elimination rate constant)
Cl/Vd
or
0.693/half life
51
t1/2 (half life)
0.693/ ke
52
Predicting Drug Concentration
C2 = C1 x e^(kt)
53
Loading Dose
(desired concentration x Vd) / F
54
MAP
2/3 DBP + 1/3 SBP
55
Phenytoin (Total) Correction
*for Alb < 3.5
Total phenytoin / [(0.2 x Alb) + 0.1]
56
AdjBW
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
pH
pKa + log [base/acid]
58
Odds Ratio
(# exposed w toxicity x #NOT exposed w/o toxicity) / (#exposed w/o toxicity x #NOT exposed w toxicity)
59
Incremental Cost Ratio
(Cost A - Cost B) / (Effect A - Effect B)
60
Loading Dose
Concentration x Vd / F
61
predicting concentration
level x e^(-ke x t)
62
% ionization (weak base)
100 / (1 + 10^ (pH - pKa))
63
% ionization (weak acid)
100 / (1 + 10^ (pKa - pH))
64
E value
(58.5 x i) / (MW x 1.8)
65
Bioavailablility (F)
100 x (AUCpo/AUCiv) x (DOSEiv/DOSEpo)
OR
serum concentration/ dose given PO
66
Clearance
F x Dose / AUC
OR
Rate elimination/ Concentration
