Math & conversions Flashcards
1 cc =
1 ml
cc stands for cubic centimeter
1 foot =
0.3048 m
ml to (imperial) pint conversion, approximated
500 milliliters (mL) = approx 1 pint
1 qt = (oz)
32 oz
1 cup =
~250 ml
8 oz
oz= (mls and tsp)
29.57 mL
2 tb nsp
1 ml of H2O weighs
1 g
Percent solutions weight
Xg/100mL (ie 1% is 1g/100mL, 10% is 10g/100mL)
Percent solutions volume
XmL/100mL (ie 2% is 2mL/100mL)
gtt=
Drops
mcgtt
microdrops
Body Surface Are dosing full formula
Dose = square root [(Height (cm) x Weight (kg)) / 3600]
Rounding with syringes
- Amounts less than 1 mL are rounded to nearest hundredth
- decimal places. Amounts more than 1 mL are rounded to tenth
miles to km
1.6miles
Drip rate calculation
Total volume x drip factor ÷ time = flow rate (gtt/min)
mnemonic- “TV will make you deaf over time,” which is:
TV – total volume
Deaf = DF or drip factor
Over = divided by (or over)
Time = time prescribed by the physician
ie- 3ml/1 minute x 10gtt/3ml = 30gtt/3min = 10gtt/1min
Drip rate shortcuts
For 10 gtt/ml sets, divide flow rate by 6.
For 15 gtt/ml sets, divide flow rate by 4.
For 20 gtt/ml sets, divide flow rate by 3.
Desired dosage Formula
D/H x Q = X
X is Desired dose (ml)
D is ordered Dose amount
H is Amount on Hand
Quantity.
For example, a provider requests lorazepam 4 Mg IV Push for a patient in severe alcohol withdrawal. The clinician has 2 1mg/1mL vials on hand. How many milliliters should he or she draw up in a syringe to deliver the desired dose?
X= Dose ordered (4 mg) x Quantity (1 mL)/Have (2 mg) = Amount wanted to give (2 mL)
https://www.ncbi.nlm.nih.gov/books/NBK493162/
BSA using constants
BSA (in m2) = k × BW2/3
K = 0.101 in dogs or 0.1 in cats X kgs or
bw = body weight
Find a dilution formular
V1 × C1 = V2 × C2
V1C1 is what you have on hand
microgram
written as ug (u has a tail for first part
1 ug =0.000001 g
Dosage calculations
Animal body weigh X mass of drug/dosage = dose
Determine the amount of solute needed to make a desired amount of solution
% x desired volume/100
1 Tbsp = ___ tsp
3 tsp
1 ltr converted to imperial
approx 1 qt
(946.4 mL
500 mL =
1 pt (473 mL)
= 2 cups (equivalent to 1 lb of water)
1 gallon = __ pints?
8
1 mL = (Drops)
20 gtt
grain =
65 mg
The next formula can be used to adjust the dosage (mcg/kg/min) in accordance with the response of the animal.
M = DWV/R16.67
M = number of milligrams of drug to add to delivery fluid
D = dosage of drug in micrograms per kilogram per minute
W = patient body weight in kilograms
V = volume in milliliters of delivery fluid
R = rate of delivery in milliliters per hour
16.67 = conversion factor
percent change
change ÷ original. = percent change
To convert a percent concentration to a ratio concentration
set up a ratio based on percentages
Example: Convert a 3.1% solution to a ratio concentration.
3.1/100 = 1/x
3.1x/100 =1
x =100/3.1
X = 32
Adding dose to IV fluid formula
Volume=Dose/concentration
Add 20 mEq of potassium (KCl) to a bag of IV fluids containing 1 L (1000 mL). The concentration of potassium is 2 mEq/1mL.
Volume needed = 20mEq/2mEq
Volume needed = 10mEq
Farenheit to Celsius
°F = (9/5 × °C) + 32
Maintenance fluids (simple - 2 options)
1ml of fluid per pound of body weight per hour.
20–30 ml per pound per day.
Fluid rate
daily fluid requirement and divide by 24 and give at that
rate
If the animal is experiencing shock, it needs its fluids a bit more quickly to help get it out of shock. Rapid administration for dogs is 40 ml/lb/hour and 20–30 ml/lb/hr in cats.
