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Lung allocation score : ウィキペディア英語版 | Lung allocation score The lung allocation score (LAS) is a numerical value used by the United Network for Organ Sharing (UNOS) to assign relative priority for distributing donated lungs for transplantation within the United States. The lung allocation score takes into account various measures of a patient's health in order to direct donated organs towards the patients who would best benefit from a lung transplant. The LAS system replaces the older method within the United States of allocating donated lungs strictly on a first-come, first-served basis, according to blood type compatibility and distance from the donor hospital. The older method is still used for patients under the age of 12. The LAS system is still being evaluated and revised.〔Kern, Dayle: "Advocates at Work: Unique Team Responds to Transplant Inequities for PH Patients", article on page 7 of the Winter 2007 ''Pathlight'' newsletter of the Pulmonary Hypertension Association.〕 The reason for this continuing analysis is the need to balance on one hand the desire to help those patients in direct need, versus the statistical likelihood of the patient to survive the procedure, as well as the post-operative risks of infection and transplant rejection.〔Grady, Denise: "Updated Rules Shorten Waits For New Lungs", article in the September 23, 2006 issue of ''The New York Times''.〕 ==Lung allocation scoring method== The lung allocation score is calculated from a series of formulas that take into account the statistical probability of a patient's survival in the next year without a transplant, and the projected length of survival post-transplant. A raw allocation score, summarizing all of the above values, is calculated, and finally this score is normalized to obtain the actual LAS, which has a range from 0 to 100. Higher lung allocation scores indicate the patient is more likely to benefit from a lung transplant.
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