Finding the right tests…
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Finding the right tests…
CT Scan
CT guided FNAC uses the same idea as a guided biopsy - CT images steer a needle to a lesion - but the needle itself is thinner, and instead of a solid core of tissue, it draws out loose cells for a cytology test. That makes it a different sampling technique from a core needle biopsy, not just a smaller version of it: cytology looks at individual cells, while a biopsy preserves how cells are arranged in tissue. Doctors often choose FNAC first when a lesion is close to the skin or in a location where a thinner needle is safer, for example near major blood vessels.
This test draws out cells, not a tissue core, from the target area using a thin needle guided by CT. A cytopathologist examines those cells under a microscope to look for cancer or infection. Your doctor may still recommend a core biopsy afterward if the cell sample isn't conclusive.
FNAC stands for fine needle aspiration cytology. A thin needle, narrower than the one used for a core biopsy, is guided by CT into the lesion and used to draw out cells and fluid rather than a solid piece of tissue. Those cells go to a cytopathologist, who studies them under a microscope.
A thinner needle generally means a lower chance of bleeding or a collapsed lung compared with a core biopsy needle, which is one reason doctors reach for FNAC when the lesion sits somewhere less forgiving, such as close to a major vessel. The trade-off is that cytology sometimes can't classify a tumor as precisely as a tissue biopsy can, since it doesn't preserve how the cells were arranged.
- Thyroid nodules - Enlarged lymph nodes - Lung nodules in a location that favours a thinner needle - Suspicious masses where a first, less invasive sample is wanted
Cytology results are sometimes inconclusive, in which case your doctor may order a follow-up core needle biopsy to get a tissue sample instead. Ask your doctor how likely that is for your specific case.
FNAC uses a thinner needle to draw out individual cells for cytology, while a biopsy uses a wider needle to remove a solid core of tissue for histology. Biopsy generally gives a more complete answer, but FNAC carries a lower risk.
FNAC is often chosen when the lesion sits somewhere a thinner needle is safer, such as near a major blood vessel, or when a quick first look at the cells is enough to guide next steps.
You'll receive local anaesthetic at the site, so sharp pain is unlikely, though you may feel pressure while the needle is positioned. Tell the team if you feel significant discomfort.
Cytology samples are sometimes inconclusive. If that happens, your doctor may recommend a follow-up core needle biopsy to get a tissue sample instead.
This page is general information about the test, not medical advice. Your own report's reference ranges apply — please discuss your results with your doctor.
Generally yes, because the needle is thinner, which tends to mean less bleeding and a lower chance of complications like a collapsed lung near the chest. It can also mean a less complete diagnosis in some cases.
The sample needs to be processed and reviewed by a cytopathologist. Ask your doctor or the centre how long that typically takes for your test.
Blood-thinning medication often needs to be paused before a needle procedure. Tell your doctor about everything you're taking well ahead of your appointment.
Most FNAC procedures only need local anaesthetic at the skin. Ask your doctor if sedation is an option for your particular case.