What does a FibroScan show?
A FibroScan measures how stiff the liver is, in kilopascals, which estimates scarring, and usually a CAP score, which estimates fat. It takes about ten minutes, needs no needle and does not hurt. The numbers only mean something when a clinician reads them with your blood tests and history.
How the measurement works
The probe sends a small vibration through the skin and times how fast it travels. Scarred liver is stiffer, so the wave moves faster. The result is a stiffness score in kilopascals (kPa). Most machines also report a CAP score, which estimates how much fat is in the liver.
Both numbers have to be read together with your blood tests, your history and sometimes an ultrasound. The same kPa value means different things in hepatitis B than in fatty liver, and a recent meal or inflammation can push it up. That is why the doctor, not the printout, decides what it means.
Before the scan
You will usually be asked not to eat for a few hours beforehand. Wear something that lets the right side of your ribs be reached. Bring earlier scans so the two can be compared.
Other tests you may hear about
Liver function tests (ALT, AST, bilirubin, albumin), hepatitis markers, an ultrasound, and occasionally a biopsy. Not everyone needs all of them. Part of the consultation is working out which ones will actually change the plan.
Before you come
- Earlier scan and blood reports
- Ask whether you need to fast, and for how long
- Ask where the scan is done and the cost that week
Common questions
Does a FibroScan hurt?
No. You feel a light tap on the skin. There is no needle and no radiation.
Does it replace a biopsy?
For many people it avoids one. In some situations a biopsy still gives information nothing else can. The doctor will say which applies to you.
Can I book the scan without seeing the doctor?
It is better to be seen first. Many people who ask for a FibroScan turn out not to need one, and some need a different test instead.
Sources: NIDDK: Diagnosis of NAFLD and NASH
This is general health information, not personal medical advice. Talk to a clinician about your own reports and symptoms.