小腿压痛+小腿增粗 4 cm+可凹性水肿，无其他诊断 → 3（高/DVT 可能） 压痛(+1)+小腿周径≥3cm(+1)+可凹性水肿(+1)=3。三分层：高(~17-53%)。二分层：DVT 可能→加压超声。{"result":"Wells DVT total 3. Three-tier: High (≥ 3). Two-tier: DVT likely (≥ 2).","metadata":{"input":{"cancer":false,"paralysis":false,"bedridden":false,"tenderness":true,"wholeLeg":false,"calfSwelling":true,"pittingEdema":true,"collateralVeins":false,"previousDvt":false,"alternative":false},"result":{"total":3,"components":{"cancer":0,"paralysis":0,"bedridden":0,"tenderness":1,"wholeLeg":0,"calfSwelling":1,"pittingEdema":1,"collateralVeins":0,"previousDvt":0,"alternative":0},"threeTier":{"category":"High (≥ 3)","interpretation":"Three-tier: high probability (~17–53%)."},"twoTier":{"category":"DVT likely (≥ 2)","interpretation":"Two-tier: DVT likely — obtain proximal compression ultrasound and/or D-dimer."},"method":"Wells DVT (Wells 1997 Lancet; Goodacre 2005 BMJ)","model":"Not medical advice."}}}
蜂窝织炎与 DVT 同样可能 → 其他诊断 −2 使得分 0（低/不太可能） 压痛(+1)+可凹性水肿(+1)+其他诊断同样可能(−2)=0。三分层：低(~5%)。二分层：DVT 不太可能——阴性 D-二聚体可排除。{"result":"Wells DVT total 0. Three-tier: Low (≤ 0). Two-tier: DVT unlikely (≤ 1).","metadata":{"input":{"cancer":false,"paralysis":false,"bedridden":false,"tenderness":true,"wholeLeg":false,"calfSwelling":false,"pittingEdema":true,"collateralVeins":false,"previousDvt":false,"alternative":true},"result":{"total":0,"components":{"cancer":0,"paralysis":0,"bedridden":0,"tenderness":1,"wholeLeg":0,"calfSwelling":0,"pittingEdema":1,"collateralVeins":0,"previousDvt":0,"alternative":-2},"threeTier":{"category":"Low (≤ 0)","interpretation":"Three-tier: low probability (~5%)."},"twoTier":{"category":"DVT unlikely (≤ 1)","interpretation":"Two-tier: DVT unlikely — a negative D-dimer can rule out DVT without ultrasound."},"method":"Wells DVT (Wells 1997 Lancet; Goodacre 2005 BMJ)","model":"Not medical advice."}}}