Calculations

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Author:
capnhue
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278751
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Calculations
Updated:
2014-07-28 16:20:50
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Calculations
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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
    • *add 0.8 when adding an ion
  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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