MELD Score Calculator (MELD, MELD-Na, MELD 3.0)
Enter serum creatinine, bilirubin, INR, sodium, albumin and sex to calculate the MELD (Model for End-Stage Liver Disease) score in three versions: the original MELD, the MELD-Na used by OPTN from 2016, and the current MELD 3.0 standard adopted in 2022. The calculator applies OPTN clamping rules, flags dialysis automatically, and shows 90-day waitlist mortality alongside a full step-by-step breakdown of the formula.
Formula
Worked example
Male patient: creatinine 1.2 mg/dL, bilirubin 2.0 mg/dL, INR 1.5, sodium 138 mEq/L, albumin 3.5 g/dL. Original MELD = 10 × (0.957×ln(1.2) + 0.378×ln(2.0) + 1.120×ln(1.5) + 0.643) = 10 × (0.957×0.182 + 0.378×0.693 + 1.120×0.405 + 0.643) = 10 × (0.174 + 0.262 + 0.454 + 0.643) = 10 × 1.533 = ~15. MELD 3.0 for the same values (male, Na clamped to 137, albumin clamped to 3.5): score is approximately 15-16 with no female or albumin/sodium adjustments.
What is the MELD score?
The Model for End-Stage Liver Disease (MELD) is a mathematical formula that predicts short-term mortality in patients with chronic liver disease. Developed at the Mayo Clinic by Dr. Patrick Kamath in 2000, it was originally used to assess survival after transjugular intrahepatic portosystemic shunt (TIPS) procedures. In 2002, OPTN/UNOS adopted it to prioritize liver transplant waitlist candidates, replacing the subjective Child-Pugh score with an objective, lab-based ranking. A higher score means higher urgency and higher 90-day mortality risk without transplantation.
Three versions of MELD: which one applies to you?
The original MELD (2002-2016) uses creatinine, bilirubin, and INR. MELD-Na, adopted by OPTN in January 2016, adds serum sodium to account for the independent mortality risk of hyponatremia in cirrhosis; a low sodium level can raise the score by up to 11 points. MELD 3.0, implemented by OPTN in July 2022, adds serum albumin and a 1.33-point adjustment for female sex, correcting for documented disparities in transplant access. MELD 3.0 is the current standard for US organ allocation. International centers outside the US may still use the original MELD or MELD-Na. If you are unsure which version applies to your case, confirm with your transplant center.
OPTN input clamping rules
The OPTN/UNOS formula applies strict bounds to prevent extreme values from dominating the score. Creatinine is clamped to 1.0-4.0 mg/dL for original MELD and MELD-Na, and to 1.0-3.0 mg/dL for MELD 3.0. If the patient has received dialysis at least twice in the past 7 days, creatinine is automatically set to 4.0 mg/dL. Bilirubin and INR are floored at 1.0. In MELD-Na, sodium is clamped to 125-140 mEq/L. In MELD 3.0, sodium is clamped to 125-137 mEq/L and albumin to 1.5-3.5 g/dL. The maximum score reported for allocation purposes is 40, regardless of the calculated raw value.
Using the MELD score clinically
A MELD score of 15 or higher is the commonly cited threshold at which the survival benefit of transplantation exceeds the operative mortality risk. Scores below 10 indicate compensated disease with low short-term mortality; active listing is generally not recommended unless disease-specific exceptions apply. Scores of 20-29 indicate decompensated cirrhosis with approximately 20% 90-day mortality; weekly to bi-weekly lab monitoring is standard. Scores of 30 or above carry more than 50% 90-day mortality and typically result in high UNOS waitlist priority. The MELD score does not account for MELD exception points, which transplant centers can request for conditions like hepatocellular carcinoma, hepatopulmonary syndrome, or primary hyperoxaluria.
MELD score: 90-day waitlist mortality
| MELD score | 90-day mortality | Transplant priority |
|---|---|---|
| 6-9 | ~1.9% | Low - outpatient management |
| 10-14 | ~6.0% | Moderate - consider transplant listing |
| 15-19 | ~6.0% | Active listing - survival benefit threshold |
| 20-24 | ~19.6% | High priority - frequent monitoring |
| 25-29 | ~19.6% | High priority - decompensated disease |
| 30-39 | ~52.6% | Critical - high UNOS waitlist priority |
| 40 (max) | ~71.3% | Highest urgency - score capped at 40 |
Observed 90-day mortality data from OPTN/UNOS registry studies. MELD 3.0 scores may differ slightly from original MELD at the same lab values. All versions share these band-level risk estimates.
Frequently asked questions
What is a dangerous MELD score?
Any score above 25-30 is associated with very high short-term mortality without transplant. Scores of 30-39 carry roughly 52% 90-day waitlist mortality, and scores at or above 40 (the maximum OPTN allocation cap) are associated with approximately 71% 90-day mortality. At these levels, urgent transplant evaluation is typically indicated.
Why does MELD 3.0 add points for female sex?
Studies showed that female patients at the same lab values tended to have worse waitlist outcomes and were less likely to receive transplants compared to male patients. Kim et al. (2021) found that adding 1.33 points for female sex, along with serum albumin (which tends to be lower in women with cirrhosis), better predicted 90-day mortality and reduced the observed access disparity.
Why is creatinine set to 4.0 mg/dL for patients on dialysis?
Dialysis removes creatinine from the blood, so a dialysis patient may have a deceptively low serum creatinine level despite severe kidney failure. Setting creatinine to 4.0 mg/dL ensures the score properly reflects the severity of renal dysfunction, which is a major driver of mortality in liver disease.
Can the MELD score go higher than 40?
The raw calculated score can mathematically exceed 40, but OPTN/UNOS caps the value used for organ allocation at 40. This prevents extremely ill patients from accumulating disproportionate allocation priority beyond the defined maximum urgency tier. Scores above 40 are recorded internally but reported and allocated at 40.
Does a higher MELD score guarantee I will receive a transplant sooner?
A higher MELD score gives you higher priority in the OPTN waitlist algorithm, but other factors also matter: blood type compatibility, donor organ characteristics, geographic proximity to the donor, and transplant center-specific thresholds. Some patients receive exception points for conditions not well captured by the MELD formula (such as hepatocellular carcinoma), which can further influence waitlist position.
Is MELD used for pediatric patients?
No. Children under 12 are evaluated using the PELD score (Pediatric End-Stage Liver Disease), which uses different variables including albumin, bilirubin, INR, growth failure, and age under 1 year. MELD is validated only in patients aged 12 and older.
How often is the MELD score recalculated?
OPTN requires labs to be updated on a schedule that depends on the current score: patients with a score of 25 or higher require labs every 7 days; scores 19-24 require labs every 30 days; scores 11-18 require labs every 90 days; and scores 10 or lower require labs every year. More frequent monitoring is common in clinical practice when the patient is clinically deteriorating.
Sources
- Kim WR et al. MELD 3.0: The Model for End-Stage Liver Disease Updated for the 21st Century. Hepatology, 2021.
- OPTN/UNOS Policy 9: Allocation of Livers and Liver-Intestines (current policy document).
- Kamath PS et al. A model to predict survival in patients with end-stage liver disease. Hepatology, 2001.