Key points
- A healthy liver regrows most of its original volume within a few weeks to a few months after part is removed.
- In healthy people, surgeons generally leave at least about 25–30% of the liver behind; more is kept when the liver is fatty, scarred or damaged by chemotherapy.
- Liver donors give anywhere from about a fifth (for a child) to about two-thirds (for an adult) of their liver and return to normal life; long-term health in carefully selected donors is generally good.
- The regrown liver does not return to its exact original shape, but it regains its function.
Why the liver can regrow
Most cells in the heart or brain cannot divide once we are adults. Liver cells (hepatocytes) are different. They normally rest, but when part of the liver is removed, signals from the gut, the blood and the remaining liver tell them to re-enter the cell cycle and multiply. Within a day or two of surgery, liver cells are dividing; blood vessels and bile ducts grow alongside them.
The body seems to 'know' how much liver it needs relative to its size. Growth slows and stops once the liver volume is close to what the body requires — which is why a small piece of adult liver transplanted into a child grows with the child, and a half-liver in an adult grows back towards a full-size organ.
Regrowth, not a new lobe
The removed part does not grow back as a new lobe. Instead, the remaining segments enlarge. The liver ends up a different shape, but its total volume and function recover.
How fast does the liver grow back?
| Time after surgery | What typically happens in a healthy liver |
|---|---|
| First few days | Liver blood tests rise and then settle; cell division is at its peak; mild jaundice can occur after a large resection |
| 1–2 weeks | Much of the fastest growth happens here; liver function is largely back to normal in most patients |
| 4–8 weeks | Volume commonly reaches roughly 70–90% of the original on scans |
| 3–12 months | Growth continues more slowly; many people reach close to their original volume, though some remain slightly smaller |
Function recovers ahead of size. People feel tired for several weeks after major liver surgery, but this reflects healing from a large operation, not a shortage of liver.
How much of the liver can safely be removed?
Surgeons talk about the future liver remnant — the part left behind. It must be large enough to keep the patient well while it regrows. If too little is left, the patient can develop post-hepatectomy liver failure: jaundice, fluid build-up, clotting problems and confusion, which can be life-threatening.
- Healthy liver: a remnant of at least about 25–30% of the total volume is generally considered safe.
- Liver affected by chemotherapy, significant fat or fibrosis: surgeons usually want around 30–40% or more.
- Cirrhosis: the scarred liver regenerates poorly, so often 40% or more is needed, and many patients with cirrhosis are not safe for a large resection at all — which is why liver transplant is sometimes the better treatment for a tumour in a cirrhotic liver.
The volume is measured on a CT scan before surgery. When the remnant would be too small, surgeons can block the blood supply to the part being removed (portal vein embolisation) a few weeks beforehand, so the remaining side grows first. Details are on the liver resection surgery page.
What this means for living liver donors
In a living donor liver transplant, a healthy relative gives part of their liver. For an adult recipient this is usually the right lobe (roughly 55–65% of the liver) or the left lobe; for a child, a much smaller left-sided segment (often around 20–25%). Both the donor's remaining liver and the transplanted graft regrow.
Donor safety depends on careful selection: a healthy liver with little fat, suitable anatomy, and a remnant comfortably above the safe minimum. That is why donors undergo blood tests, CT volume measurement and sometimes MRI or a FibroScan — see who can be a liver donor. The operation itself, including laparoscopic and robotic donor hepatectomy, is major surgery, and the risk is not zero: complications such as bile leak or infection occur in a minority of donors, and donor deaths, though rare, have been reported worldwide.
- 1
Hospital
Donors typically stay in hospital about a week.
- 2
Home recovery
Most return to desk work in about 4–8 weeks, and to heavier physical work in around 3 months.
- 3
Long term
Long-term follow-up studies show that most donors have normal liver function and live normal lives, with no need for long-term medicines. Periodic check-ups are advised.
After liver cancer or tumour surgery
Patients who have part of the liver removed for liver cancer, bowel cancer that has spread to the liver, bile duct cancer or benign tumours rely on the same regeneration. In a healthy liver, the remnant grows back and patients return to a normal diet and activity. In patients with underlying liver disease, recovery depends much more on how well that remaining liver works, which is why pre-operative assessment is so careful.
Common myths about living with less liver
Myth: donors must follow a special diet for life
Once recovered, donors eat normally. Sensible habits — limiting alcohol, keeping a healthy weight — are advised for everyone.
Myth: a cirrhotic liver will grow back like a healthy one
Scarred livers regenerate poorly. Cirrhosis is not reversed by surgery, and resection can precipitate liver failure.
Myth: donating a liver shortens life
In carefully selected donors, long-term studies do not show a shortened life expectancy, although the operation carries a small upfront risk.
Myth: women cannot have children after donating
Donors are usually advised to wait until recovery is complete — often about a year — after which pregnancy is generally considered safe.
Frequently asked questions
Can a person live a normal life with half a liver?
Yes. If the remaining liver is healthy, it regrows close to its original volume and the person lives normally. Living liver donors are the clearest example.
How long does it take for the liver to grow back?
Most of the regrowth happens within the first 4–8 weeks, with slower growth continuing for months. Function usually recovers before the size does.
How much of the liver can be removed safely?
In a healthy liver, surgeons generally leave at least about 25–30% of the total volume. More must be left if the liver is fatty, scarred or has been exposed to chemotherapy.
Does the donated part grow in the recipient too?
Yes. The transplanted graft also enlarges to match the recipient's needs, usually over the first few weeks to months.
Is being a liver donor safe?
It is major surgery with a small but real risk of complications and a very rare risk of death. Careful selection and an experienced team keep the risk low, and most donors return to full health. Read who can be a liver donor for the assessment process.
Can someone with cirrhosis have part of their liver removed?
Only in selected cases with well-preserved liver function and a small operation. The cirrhotic liver regenerates poorly, so for many patients a transplant or non-surgical treatment is safer.
Related reading
Living Donor Liver Transplant →
A family member donates part of their liver; both recover.
Liver Donor Surgery in Kolkata: The Donor Operation and Recovery →
What happens in living liver donor surgery: right lobe, left lobe or left lateral graft, open vs laparoscopic vs robotic, safety, recovery and regrowth.
Who Can Be a Liver Donor? Eligibility, Tests and the Legal Process in India →
Living liver donor eligibility in India — age, blood group, BMI, fatty liver, liver size — the donor tests, THOTA approval and the right to withdraw.
Liver Resection (Hepatectomy) Surgery in Kolkata →
Hepatectomy explained: when part of the liver is removed, how much is safe, portal vein embolisation, open vs laparoscopic surgery, risks and recovery.
Liver Cancer Surgery →
Surgery and transplant for hepatocellular carcinoma and liver tumours.
This page is general patient information, not a diagnosis or a substitute for a consultation. Treatment decisions depend on each patient's reports and examination. Read our medical disclaimer and editorial policy.