A MELD score is a number that predicts how urgently a person with liver disease needs a transplant within the next three months. It stands for Model for End-Stage Liver Disease, and it ranges from 6 (less ill) to 40 (gravely ill). The higher your score, the higher your priority on the liver transplant waiting list.
How the MELD Score Works
The MELD score exists to solve a difficult problem: when a donor liver becomes available, who should get it? Before the MELD system, transplant centers relied more heavily on waiting time, which meant someone who had been on the list longer could receive an organ before someone who was much sicker. The MELD score replaced that approach with a formula based on lab tests that reflect how well (or poorly) the liver and kidneys are functioning.
The score is plugged into a computerized matching system run by the United Network for Organ Sharing (UNOS). When a liver becomes available, the system ranks candidates primarily by medical urgency. Waiting time only comes into play as a tiebreaker when two patients in the same geographic area have the same MELD score.
For children under 12, a separate system called the PELD (Pediatric End-Stage Liver Disease) score is used instead. The MELD score applies to adults and children 12 and older.
What the Numbers Mean
Each MELD score corresponds to a risk of dying within 90 days without a transplant. The higher the score, the greater the urgency.
- Below 9: Roughly 2% risk of death within 90 days
- 10 to 19: About 6% risk
- 20 to 29: Around 20% risk
- 30 to 39: Over 50% risk
- Above 40: Greater than 70% risk
These numbers make clear why the score matters so much for allocation. A person with a MELD of 35 faces a dramatically different outlook than someone at 15, and the transplant system is designed to reflect that gap.
What Lab Tests Go Into the Score
The MELD score is calculated from a formula that uses blood test results measuring liver and kidney function. The core labs include bilirubin (a waste product the liver clears from the blood), creatinine (which reflects kidney function), and INR (a measure of how well the blood clots). When any of these values are abnormal, it signals that the liver is struggling to do its job.
The most recent version of the score, called MELD 3.0, was implemented in July 2023. It added two new variables: albumin (a protein made by the liver) and the patient’s sex assigned at birth. The sex variable was included because research had shown that women were historically disadvantaged by the old formula. Women tend to be shorter and have smaller body sizes, which affected their lab values in ways that made them appear less sick than they actually were. MELD 3.0 was specifically designed to correct that disparity. Studies since its rollout have found that the benefit has been most pronounced for shorter candidates, particularly shorter women.
How Often the Score Is Updated
Because liver disease can change quickly, MELD scores are recalculated on a regular schedule. How often depends on how sick you are:
- Score of 25 or higher: Updated every week
- Score of 19 to 24: Updated every 30 days
- Score of 11 to 18: Updated every three months
- Score of 10 or less: Updated once a year
Each update requires fresh blood work. If your condition worsens between updates, your transplant team can order new labs sooner. A rising MELD score moves you up the waiting list; a stable or improving score keeps you in place.
Exception Scores
Some liver conditions are life-threatening but don’t show up well in the standard lab tests. Liver cancer is the most common example. A tumor can be growing aggressively while bilirubin, creatinine, and INR remain relatively normal, leaving the patient with a misleadingly low MELD score.
For situations like these, transplant teams can request an “exception score.” This is a MELD-equivalent number assigned through a review process rather than calculated from labs. It places the patient at a priority level that better reflects their actual medical urgency. The exception score is used in the matching system in place of the lab-calculated number, ensuring that candidates with conditions the formula doesn’t capture aren’t left waiting while their disease progresses.
What a MELD Score Means for You
If you or someone close to you has been given a MELD score, it tells you two things: how severely the liver is affected right now, and roughly where you stand on the transplant list relative to others. A low score (under 10) generally means the liver, while damaged, is still functioning well enough that transplant isn’t immediately urgent. A score in the mid-range (15 to 25) indicates significant disease that needs close monitoring. Scores above 30 reflect serious, life-threatening liver failure.
The score is not a fixed number. It moves with your lab results, which is why consistent follow-up and blood work matter. Some people see their scores climb steadily over months or years. Others experience sudden jumps during acute episodes of liver failure. In either case, the MELD system is designed to respond, automatically adjusting your place on the waiting list as your condition changes.