basic ivf computations

7/31/2019 Basic IVF Computations

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Basic Computation/s

Part IIIV Drugs & IVF

Chapter 4



Interpretation/Calculati

ng Medication DosagesRatio – is the relationship of twoquantities

1:10 , 1:25001/10 , 1/2500




ng Medication DosagesRATIO

e.g For every 20 students there is1 teacher. The ratio of teacher tostudents is 1 in 20 or 1:20 or 1/20



Proportion – formed by using tworatios that are equal

1 = 5 = 2 x 5 = 10 x 12 10

Cross products are equal to10 = 10

½ is equal to 5/10


ng Medication Dosages



ProportionDose ¼ = 3/12

Cross products are 12 = 12

¼ = 3/12



Example:

The Md orders 20 mg IM of a drugfor a patient. The drug is available in 10

ml vial that contains 50 mg of drug.How many ml will be needed to supplythe dose of 20 mg?Given :1. 10 ml vial2. 50 mg of drug in 10 ml vial3. 20 mg is the desired



Cont.Ratio 10ml = 1ml

50mg 5mg

Ratio for the required dose x ml20 mgProportion : 1ml = x ml

5mg 20 mg

5 x x = 1 x 205x = 20 x = 4ml ( 20 divided by 5 )



Example/s:.1. Ampicillin oral susp. 250mg/5ml .

How many ml would be measuredinto a medication syringe to obtaina dose of 75mg of ampicillin?



Example/s2. Paracetamol 125mg/ 5ml. Howmany ml would be measured into amedication syringe to obtain 15mg of Paracetamol?



Example/s3. How many ml of Paracetamol IVshould be given to obtain a dose of 15mg in a 15kg-man, if a vialcontains 300mg/2ml of Paracetamol?



Example/s4. A vial contains 250mg of tetracycline HCl in a total of 2 mlof solution. How many mg of tetracycline HCl are contained in0.6 ml of this solution?



Systems of

measurement1000 g = 1 kg1000 mg = 1 g1000 ng = 1 mcg1000 ml = 1 L

100 ml = 1 dL



Systems of

measurementRule: 1

To convert a quantity in the metricsystem to a large metric unit (mgto g) move the decimal point tothe leftSmaller to larger =right to left

Example: 2mg = 0.002g



Systems of

measurementRule: 2

To convert a quantity to a smallermetric unit, move the decimalpoint to the rightExample: 2.4 l = 2400 ml



ExamplesConvert 25 g to mgConvert 150 ml to liters



Apothecary System of

weights based upon the grain , which is thesmallest unit in the systemNitroglycerin 1/100gr, 1/150 grAtropine sulfate 1/200gr. 1/150 grApproximate equivalent

15 grains = 1 gram1grain = 60 mg



Apothecary System of

weightsConvert 15 milligrams to grains

1 grain = x grain 60 mg 15 mg

60 x = 15x = 15/60

x = .25 grain



Example:The physician orders 7 ½ grains of aminophylline po for a client. On handare aminophylline tablets 500 mg. Howmany tablets are required for one dose?GIVEN:

1 gram = x gram15 grain 7.5 grain

15 x = 7.5

x = 0.5 g (500mg)



Example:

How many mg of nitroglycerin arein one 1/150 grain tablet of thedrug?Given:1 gram = x gram15 grains 1/150 grains15 x = 1/150 = .0067

x = 0.0004g = 0.4 mg



Calculation of

Fractional Doses:ratio and proportion



Example:

The Md orders 1,000,000 units of Pen Gfor a patient. The pen G on hand is

available as a solution containing250,000 units/ml 250,000 units = 1, 000,000units

1 ml x ml 250,000x = 1,000,000

x = 4 ml



Example 1:

The physician orders 250 mcg of Vitamin B12 IM daily. The vitaminon hand is labeled 1,000mcg/ml.How many ml should be given tothe patient?



Example 2:

A patient is to be given 25 mgDiphenhydramine po and isavailable as 12.5mg/5ml prep..How many ml should be given?



Example 3:

A medication order calls for 750mg calcium lactate to be given TIDPO. On hand are tablets of calciumlactate 0.5 g. How many tabletsshould be given for each dose?



Calculation of DosagesBased on Weight

The physician ordersthiabendazole chewable tablets fora 110 pound child. Therecommended dosage is 20mg/kg/dose. How many 500 mg

tablets should be given to thispatient for each dose.



Calculation of DosagesBased on Weight

Convert weight to kg20 mg = x mg1 kg 50 kg

x = 1000 mg

500 mg = 1000mg1 tab x tabx = 2 tablets per dose



Example:

The recommended dose of Meperidine is 6mg/kg/day for pain.It is given every 4 to 6 hours. Howmany ml of Demerol injection50mg/ml should be administered

to a 33 pound child as a singledose every 6 hours?



Cont.

Calculate the daily dose for a 33-pound child

6mg/ 1 kg (2.2lb) = x mg / 33 lbx = 90 mg Demerol / day



Cont.

Calculate the number of ml of demerol injection 50 mg/mlneeded for the daily dose

50 mg/ 1 ml = 90 mg/ x ml



Cont.

Calculate the number of ml to begiven every 6 hours1.8 ml/ 24 h = x ml/ 6 h24 x = 10.8x = 0.45 ml

a c a ons n o ng



a cu a ons nvo v ngIntravenousAdministration

How long will it take to completean IV infusion of 1.5 L of D5 Wbeing administered at the rate of 45 drops /min? The IV set iscalibrated to deliver 15 drops/ml.

a cu a ons nvo v ng




Determine the number of ml/minbeing infused

Drop rate of IV set =15 gtt/1ml = 45gtt/ x ml

15 x = 45

x = 3 ml/min

a cu a ons nvo v ng




Calculate the number of ml/hour

3 ml/min. x 60 min/hr = 180/ hour

a cu a ons nvo v ng




Calculate the number of hoursrequired to administer the total

volume of the solution. If 180 ml aredelivered each hour, then how manyhours are required to administer1,500 ml?

180ml/hr = 1,500 ml/hr180 x = 1,500

x = 8.3 hours or 8 hours 20 min.



Calculations InvolvingPiggyback IV Infusion

An IV piggyback of Cefazolin500mg in 100ml/hour is ordered.

The piggyback IV set is calibratedto deliver 10 gtts.ml. How manydrops/min. should be

administered?




100 ml/ 60 min. = x ml/ min.60 x = 100

x = 1.7 ml/ min.Flow rate:

Drop rate10 gtt/ min./ 1min. = x gtt/ 1.7 ml X = 17 gtt/ min.




Daily fluid requirement2000ml of electrolyte solution

administered 24 hours and thatCefazolin sodium 500 mg in 100ml/hr is ordered QID. The number

od ml/day and the times of thepiggybank infusion must besubtracted from the daily fluid

basic ivf computations

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