# Calculations

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1. aminophylline to theophylline
1 aminophylline / 0.8 theophylline
2. measurements
• 1 grain / 65 milligrams
• 1 cup / 8 oz
• 1 pint / 473 ml
• 1 quart / 2 pints (946 ml)
• 1 gallon / 4 quarts (3785 ml)
3. BMI
weight (lbs) / height (cm)X 704.5
4. BMI classifications
• < 18.5: under weight
• 18.5 - 24.9: normal
• 25 - 29.9: over weight
• > 30: obese
5. Ideal Body Weight (IBW)
• men: 50 + 2.3(ht (in inches) - 60)
• female: 45.5 + 2.3(ht (in inches) - 60)
6. BUN:Scr ratio
ratio > 20 indicates dehydration
7. CrCl
• (140 - age) x (wt in kg) / 72 x Scr
• underweight: (<18.5) use actual weight
• normal: (18.5 - 24.9) use IBW
• overweight: (>25) use adjusted body weight
• adj body weight: IBW + 0.4 (TBW - IBW)
• *TBW - actual weight
8. GFR levels
• >90: stage 1
• 60 - 89: stage 2
• 30 - 59: stage 3
• 15 - 29: stage 4
• <15 : stage 5
9. Specific Gravity
• SG = weight (g) / volume (ml)
• water: specific gravity of 1
10. TPNs
• Carbs: 4 kcal / g
• Fat: 9 kcal / g
• protein: 4 kcal / g
• dextrose: 3.4 kcal / g
• amino acids: 4 kcal / g
• glycerin: 4.3 kcal / g
• IVFE 10%: 1.1 kcal / ml
• IVFE 20%: 2 kcal / ml
• IVFE 30%: 3 kcal / ml
11. Determining Fluid Needs
When weight over 20 kg: 1500 ml + (20 ml)(wt in kg - 20)
12. Protein requirements
• non-hospitalized: 0.8 - 1 g/kg/day
• hospitalized: 1.2 - 2 g/kg/day
13. Activity factor
• Confined to bed: 1.2
• Out of bed: 1.3
14. BEE (Basal Energy Expenditure)
BEE = non-proteins or lipids and dextrose
15. Determining grams of nitrogen from protein
• Nitrogen intake = grams of protein intake / 6.25
• NPC:N ratio - first calculate nitrogen intake
• - then divide non-protein (lipids and dextrose) by grams of nitrogen
16. Corrected Calcium
• Cacorrected = calciumserum + (4.0 - albumin)(0.8)
• calcium + phosphate: should not exceed 45mEq/L
17. mOsml/L
mOsml/L = wt of substance (g/L) / MW (g/mole) X (# of particles) X 1,000
18. Dissociation of particles for mOsml/L
• dextrose: 1
• mannitol: 1
• potassium chloride: 2
• sodium choloride: 2
• sodium acetate: 2
• calcium chloride:3
• sodium citrate: 4
19. Isotonicity: E-value
• E = (58.5)(i) / (MW of drug)(1.8)
• i = dissociation of ions
• 1 ion: 1
• 2 ions: 1.8
• 3 ions: 2.6
• 4 ions: 3.4
• 5 ions: 4.2
20. moles and millimoles
• moles = g / MW
• mmols = mg / MW
21. mEq formula
• (mg x valence) / MW
• OR
• mEq = mmlols X valence
22. compound and its valence electron for mEq formula
• ammonium chloride (NH4Cl): 1
• potassium chloride (KCl): 1
• potassium gluconate: 1
• sodium acetate: 1
• sodium bicarbonate: 1
• calcium carbonate: 2
• calcium chloride: 2
• disodium phosphate: 2
• ferrous sulfate: 2
• magnesium sulfate: 2
23. Temperature Conversions
• Celius = (F - 32) / 1.8
• Farenheit = (C x 1.8) + 32
24. Calcium Tablet Conversion
• Calcium Carbonate: 40% elemental
• Calcium acetate: 21% elemental
25. Calculating ANC
ANC = WBC X (segs + bands) / 100
26. Anion Gap equation
• Na - Cl - HCO3
• *anion gap >12mEq/L considered high
27. Henderson hasslebalch
• pH = pka + log (base / acid)
• *ammonium is acidic
• weak acid: pH > pka
• weak base: pH < pka
• *pkw = pka + pkb: pkw = 14
28. Dilution and Concentration
Q1 X C1 = Q2 X C2
29. Drug-Nutrient interactions with enteral feedings
• warfarin
• tetracycline
• ciprofloxacin
• phenytoin
30. Percent Ionization
% ionization = 100 / 1+ 10pka-pH
31. MWQ (minimum weighable quantity)
• Mwq = SR (sensitivity requirement) / % of error
• * change % to decimal first

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 Author: capnhue ID: 278751 Filename: Calculations Updated: 2014-07-28 20:20:50 Tags: Calculations Folders: Description: Calculations Show Answers:

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