Question 1

If a drug order is written for 0.25 mg/kg of body weight,what dosage would be administered to a patient weighing 88 lb?

Accepted Answer

First, convert the patient's weight from pounds to kilograms (1 kg = 2.20462 lbs). 88 lbs / 2.20462 = 39.92 kg approximately. Then, calculate the dosage: 0.25 mg/kg * 39.92 kg = 9.98 mg, which rounds to 10 mg.

Question 2

A dosage of 4 mg of morphine sulfate is ordered for a patient.How many milliliters will be administered from a vial containing 10 mg/ml?

Accepted Answer

To determine the volume of medication that needs to be administered, we can use the formula:

Volume (ml) = Ordered dose (mg) / Concentration (mg/ml)

Plugging in the values we have:

Volume (ml) = 4 mg / 10 mg/ml

Volume (ml) = 0.4 ml

Therefore, the correct answer is B, which is 0.4 ml.

Question 3

What is the percentage strength of 20 mg of cromolyn sodium in 2 ml of normal saline?

Accepted Answer

The percentage strength of a solution is calculated by the formula: (mass of solute/volume of solution) * 100. Here, 20 mg of cromolyn sodium in 2 ml of solution equals (20/2000) * 100 = 1%.

Question 4

A newborn's length at birth is measured as 45.7 centimeters.What is the newborn's length in inches?

Accepted Answer

To convert centimeters to inches, divide by 2.54. Therefore, 45.7 cm / 2.54 = 18 in. So the newborn's length in inches is 18 inches.

Question 5

An adult female patient weighs 125 lb.In order to determine a mechanical tidal volume,you must convert her weight to kilograms.What is her weight in kilograms?

Accepted Answer

To convert pounds to kilograms, divide the weight in pounds by 2.2. So, 125 lb divided by 2.2 equals approximately 56.82 kg, which rounds to 57 kg.

Question 6

How much solute is in 3 ml of a 1:100 weight/volume solution?

Accepted Answer

A 1:100 weight/volume solution indicates that 1 gram of solute is present in 100 mL of solution. Therefore, to determine the amount of solute in 3 mL of this solution, we can set up a proportion:

1 g / 100 mL = x g / 3 mL

Cross-multiplying and simplifying, we get:

x = 0.03 g = 30 mg

Therefore, the correct choice is D.

Question 7

What would the new concentration be,in percentage,of 1.5 ml of a 10% solution that has been increased to 3.0 ml with normal saline?

Accepted Answer

We can start by finding the amount of solute present in the initial 1.5 ml of the 10% solution:

10% of 1.5 ml = 0.15 ml

When this 0.15 ml of solute is diluted with an additional 1.5 ml of normal saline (to make a total volume of 3.0 ml), the concentration is cut in half:

0.15 ml / 3.0 ml = 0.05 or 5%

Therefore, the new concentration is 5%, which corresponds to choice C.

Question 8

A medication bag contains 0.03 liters.This is equal to how many milliliters?

Accepted Answer

1 liter = 1000 milliliters
Therefore, 0.03 liters = 0.03 x 1000 = 30 milliliters.

Question 9

A rescue dosage of surfactant calls for 3 ml/kg body weight.If a premature infant weighs 1,500 g,how many milliliters are needed?

Accepted Answer

To calculate the milliliters needed for a 1,500 g premature infant:
(3 ml/kg) x (1.5 kg) = 4.5 ml
Therefore, the correct answer is D) 4.5 ml.

Question 10

A solution of drug contains 80 units/ml.How many milliliters would you need to deliver 320 units of the drug?

Accepted Answer

We can use the following proportion to solve the problem:

80 units/ml = 320 units/x ml

Cross-multiplying, we get:

80x = 320

Dividing both sides by 80, we find:

x = 4 ml

Therefore, we need 4 ml of the solution to deliver 320 units of the drug.

Question 11

A patient's height is reported as 5 feet 6 inches.What is the patient's height in centimeters?

Accepted Answer

One foot is equal to 30.48 centimeters and one inch is equal to 2.54 centimeters. Therefore, the patient's height in centimeters can be calculated as follows:
5 feet 6 inches = (5 x 30.48) + (6 x 2.54) = 152.4 + 15.24 = 167.64 cm, which can be rounded to 167 cm. Option D is the closest choice.

Question 12

A patient who is 5-feet-10 inches tall is how many centimeters tall?

Accepted Answer

To convert feet to centimeters, we need to multiply by 30.48 (since 1 foot = 30.48 cm). 
So, 5 feet 10 inches can be written as 5.83 feet (since 1 inch = 1/12 feet), 
Then, 5.83 feet x 30.48 cm/foot = 177.8 cm ≈ 178 cm.

Therefore, the correct answer is D.

Question 13

A homogeneous mixture of two or more substances is referred to as:

Accepted Answer

A homogeneous mixture of two or more substances is called a solution. The other options are components of a solution - the solvent is the substance that dissolves the solute, and the solute is the substance that is dissolved in the solvent. "Dissolved" is not an appropriate term to describe the mixture as a whole.

Question 14

Virazole is supplied in a powder form that must be mixed with normal saline or sterile water prior to nebulization.This type of solution represents a:

Accepted Answer

Weight/volume solutions are created by dissolving a solid (in this case, Virazole powder) in a liquid (normal saline or sterile water), which is exactly how the solution for nebulization is prepared.

Question 15

Which of the following terms is a synonym for "active ingredient"?

Accepted Answer

A solute is the active ingredient in a solution.

Question 16

How much active drug is in 3 ml of a 10% solution?

Accepted Answer

A 10% solution means there are 10 grams of active drug per 100 ml of solution. Therefore, in 3 ml, there would be 0.3 grams (10 grams * 3 ml / 100 ml = 0.3 grams).

Question 17

A patient who weighs 55 kilograms is to receive a drug dosage of 10mg/kg.How much drug should be administered?

Accepted Answer

The patient weighs 55 kilograms and the drug dosage is 10mg/kg. To calculate the required dosage, multiply the patient's weight by the drug dosage: 55 kg x 10 mg/kg = 550 mg. Therefore, the correct choice is A) 550 mg.

Question 18

While preparing an aerosol bronchodilator for a patient,you place 0.5 ml of a 1% drug solution into a small-volume nebulizer.If you add 5 ml of saline instead of 2 ml of saline,the delivered dose of drug will:

Accepted Answer

The delivered dose of drug remains the same because the amount of the drug itself does not change; only the volume of the solution it is in changes.

Question 19

A patient with a tidal volume of 400 milliliters has a tidal volume of how many liters?

Accepted Answer

Tidal volume is measured in milliliters (mL) and can be converted to liters by dividing by 1000 (since there are 1000 milliliters in a liter). Therefore, 400 mL is equal to 0.400 liters.

Question 20

You have just assisted in the care of a premature infant who weighs 600 g.The baby's mother asks you what the weight is in pounds.You calculate the baby's weight as:

Accepted Answer

The baby's weight in pounds is calculated by converting grams to pounds. There are approximately 454 grams in a pound. Therefore, 600 grams is equal to 600 / 454 = 1.32 pounds, which rounds to approximately 1.3 pounds.

Quiz 2: The Metric System and Drug Dosage Calculations