How much radiation is involved?
More than a plain X-ray — an abdominal CT is roughly a few years' worth of ordinary background exposure.
For a scan answering a real question, that is a reasonable trade. For repeated scanning without one, it is not, which is why CT is not used casually.
Why CT rather than MRI?
CT is much faster, better for bone, lungs, bleeding and acute abdominal problems, and available to people who cannot have an MRI.
MRI is better for soft tissue, the spinal cord and joints, and uses no radiation — so where either would answer the question, MRI is generally preferred.
Do I need contrast?
It depends on the question. Contrast highlights blood vessels and makes many abnormalities far more visible.
Tell the unit if you have kidney problems, diabetes — especially on metformin — asthma, or have reacted to contrast before. These usually change how the scan is done rather than whether it happens.
Do I need to fast?
For some scans, yes — usually where contrast is being given. The imaging provider confirms exactly what is needed when you book, and it varies by body part.
Can I have a CT if I am pregnant?
It is generally avoided unless the benefit clearly outweighs the risk.
Tell the unit if you are pregnant or think you might be, before the scan. Ultrasound or MRI is usually used instead.
They found a small lung nodule. Is that cancer?
Almost certainly not. Small lung nodules are found extremely commonly on CT and the overwhelming majority are entirely benign — usually old scarring from an infection.
Standard practice is a repeat scan after an interval to confirm it is not changing. That is monitoring, not suspicion.
What does "indeterminate" mean on my report?
That the appearance is not typical enough to call either way — not that something worrying was found.
It usually means a repeat scan after a few months, which is how most indeterminate findings are resolved.
Can I have a whole-body CT to check everything?
No, and we will not refer for one.
Whole-body screening CT delivers a substantial radiation dose, finds incidental abnormalities in a large share of people, and has never been shown to save lives.
What it reliably produces is follow-up scans and anxiety. Where screening genuinely works — bowel, breast, cervical, and lung health checks for smokers — it is free and evidence-based.
Why do I need a consultation first?
Because CT involves radiation and finds things. Both are reasons to be sure the scan will answer your question before it is done.
Sometimes the right answer is a different scan, or no scan at all.