Read more about MELD and use the online MELD calculator on the Organ Procurement and Transplantation Network (OPTN) website. The higher the score, the more frequently this is done: Note: To ensure accuracy, MELD scores are continuously remeasured. The MELD score is then paired with additional factors, such as the patient’s distance from the donor hospital and chance of survival, to determine their priority. Patients are rated on a scale of 6 (least severe) to 40 (most severe). Serum Sodium Level: A measurement of sodium in the blood.Impaired kidneys are often associated with severe liver disease. Creatinine: A measurement of kidney function.INR: A measurement of the liver's ability to make blood clotting factors.Bilirubin: A measurement of how effectively the liver excretes bile.For all other adult liver candidates, their priority score is calculated using the Model for End-Stage Liver Disease (MELD), which is a formula based on several lab tests: Patients with acute liver disease (less than 1 percent of all donor candidates) receive highest priority. The remaining are prioritized based on medical urgency. When a new liver becomes available, adult candidates (i.e., those over 12 years old) who are incompatible due to medical reasons (e.g., blood type or weight) are not included on the list. Instead, whenever a new donor organ becomes available, its characteristics (e.g., size and blood type) are matched against the medical information of each candidate in the database. The national waiting list is a database that contains medical information (e.g., blood type, body size, and medical urgency) for anyone in need of a new organ in the United States and Puerto Rico. It is maintained by the United Network for Organ Sharing (UNOS). This list collects medical information for every person waiting for a new liver, allowing doctors to prioritize those with the most severe need. Before undergoing a liver transplant, patients are put on a national waiting list.
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