Alligation math questions for the PTCB exam have become more common in recent years. One of the simplest ways to answer this question is to use the alligation method. In other words, should we add 10mL of 60% solution with 40mL of 30% solution to produce 50mL of solution? Are these the correct quantities? That is the principle behind this question – to establish exactly how much of both solutions must be mixed together. The question is asking us to mix these solutions together to produce 50mL of 50% concentration. A second alcohol solution of 30 percent concentration.An alcohol solution of 60 percent concentration.We have two solutions of differing concentrations: Let’s try and break this one down into its component parts. It may be challenging to get your ahead around exactly what is going on. How many mL of 60% alcohol should be mixed with 30% alcohol to prepare 50 mL of 50% alcohol?Īt first, these kinds of question can seem difficult. The other 99.2% are non-active ingredients.Īnswer: 0.8 grams of hydrocortisone powder is needed to produce 80 grams of hydrocortisone cream at a concentration of 1%. Therefore, in this case, 1% of 80 grams = 0.8 grams Non-active ingredients in a medicine are referred to as excipients. They are also formulated with non-active ingredients such as diluents, vehicles, and preservatives, to name a few. After all, creams are not just made from active ingredients (the drug). The question asks us to find out how much of that 80 grams is hydrocortisone powder. In this case, we are talking about solids and semisolids – powers/creams etc.Ī 1% concentration = 1 gram of active ingredient in 100 grams of medicine. How much hydrocortisone powder is needed to compound 80 g of hydrocortisone cream at 1% concentration?Ĭoncentrations are routinely asked on the PTCB test. Therefore, the mL must be the numerator (top value in a fraction) and min must be the denominator (bottom value in a fraction).Īnswer: 1.9mL per minute is infused into the patient over a 7-hour period.Īt the end of the 7-hour period, all 800mL will have been administered. You may ask, why isn’t it 420 minutes / 800mL? Therefore, 800mL / 420 minutes = 1.9 mL/min Now that we have resolved the issue of units, we can continue to answer the question.Ĩ00mL is the total infusion, which is infused intravenously into the patient over a 420-minute period. There are 1,000mL in 1 liter, meaning 0.8L contains 800mL.There are 60 minutes in 1 hour, or 420 minutes in 7 hours.This means that we need to convert between units. On the one hand, it details hours and liters, but the question asks us to deliver the answer in milliliters and minutes. In this question, we have competing units. If the total volume of the infusion is 0.8L, what is the infusion rate in mL/min? Question 1Ī patient must be administered an IV infusion of a medicine over the course of 7 hours. If you read the answer explanation first, it means you lose the opportunity to learn whether you were capable of answering it correctly to begin with.
That way, you can identify where you may have gone wrong. Here, we have put together a range of four PTCB math questions – some easy, some not so easy.Īttempt each question first before reading our prepared answers. That way, you can adjust your study plan going forward: investing more time on those weaknesses, and less time on your strengths – which you only need to occasionally revise to keep on top of things.Īt first, math is difficult. Practice questions give you the chance to audit your existing knowledge base – identifying both your strengths and weaknesses. Ultimately, you must start somewhere – and the great thing about detailed answer explanations is that you can plug any knowledge gaps you may have. And it doesn’t matter if you get the questions wrong. The more questions you practice, the better. You need to practice as many sample math questions for the PTCB exam. Here, we have put together some core math questions for the PTCB exam that you need to know.Īs the adage goes, practice makes perfect. There is a lot of ground to cover, and getting your ahead around the many types of questions can prove difficult. For many students, pharmacy math is one of the most challenging parts of the PTCB exam.
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