Just because you can, doesn’t mean you should.

As a clinician, there are a huge range of tests and investigations available. Blood tests, scans, investigations, the list of what you can order goes on and on.

Some of them are quite invasive and unpleasant for the patient to go through. Others can expose them to small doses of radation. And all of them have a cost.

How do you choose which to use? The first step is to listen to the person and understand their clinical history. From that, and in conjuction with an appropriate and consented examination, one develops differential diagnoses. And only then, do we start to consider tests to confirm or exclude the diagnosis.

And of course, we have to consider, or at least should take into account, what we will do with the result of the test.

Blood tests can give an idea of the current status of many organs, but if you are complaining of UTI symptoms, i don’t need bloods, I just want a non invasive dip and will treat according to that. However, if I believe that you are anaemic and want to understand why, then a blood test may help, and guide the treatment. And if I believe there is something complex, where it shouldn’t be, then I will want to image it, whilst referring you to the most appropriate speciality.

This is especially true for complex and expensive imaging routines, such as MRI or CT. If you have simple musculoskeletal back pain, and no indication for surgery, then an MRI is not going to change matters. If your clinical history indicates a complex presentation that may require intervention then an MRI or CT is an effective next step. For context, a CT is Computed Tomography, essentially a three dimentional thin slice x-ray model, which is good for seeing hard structures. MRI is Magnetic Resonance Imaging, and best suited to soft tissues and organs.

However, far too many professionals request tests as a holding pattern, so that they feel they are doing something, and are reassuring both the patient and themselves that they are being proactive. This is not a judgement on clinical practice, simply an observed trap that we all fall in to and should be aware of.

So, as a patient, or patient advocate, take the time to check with the person what the test is for and why they think it will help. This will give them the opportunity to educate you, explain their thinking and hopefully answer any questions you may have.

From knowledge comes understanding. From understanding comes courage.