The PDF on the left is notes I had produced from my 2nd year of med school. It has some basic equations and calculations for the PSA exam.
Key thing to note is to remember your units- they will often have different units presented in the question and the answer, so remember to convert earlier on so you are working with the same units throughout.
Although the formulas are quite handy, I used a different method based working off principles rather than equations highlighted below;
Random example;
Patient requiring 5mg/kg of drug
Patient is 70kg
Drug comes in 10mg/50ml
How many ml of drug is required?
Answer (click on toggle to expand)
This also works with the above want/got formula which is essentially the same concept, but rather than trying to figure out which one is ‘want’ and which one is ‘got’, the ratio formula is what I used through the whole exam. Either technique should allow you to get through the calculations relatively quickly.
Other maths calculations may involve further steps, for example calculating how many tablets in a packet is required according to the person’s weight and dose requirements. This will be familiar the more practice questions you do.
On the day, I brought with me a basic calculator which was really useful as the online calculator is tricky to work with. This allowed me to get through questions quickly.