Table 4. Definitions of Comorbidities Included in the Hematopoietic Cell Transplantation–Specific Comorbidity Index (HCT-CI)a

HCT-CI Score
Arrhythmia: Atrial fibrillation or flutter, sick sinus syndrome, or ventricular arrhythmias Moderate pulmonary: DLCO and/or FEV1 66%–80% or dyspnea on slight activity Heart valve disease: Excluding mitral valve prolapse
Cardiac: Coronary artery disease,b congestive heart failure, myocardial infarction, or ejection fraction ≤50%Moderate/severe renal: Serum creatinine >2 mg/dL, on dialysis, or prior renal transplantationModerate/severe hepatic: Liver cirrhosis, bilirubin >1.5 × ULN, or AST/ALT >2.5 × ULN
Cerebrovascular disease: Transient ischemic attack or cerebrovascular accidentPeptic ulcer: Requiring treatment Prior solid tumor: Treated at any time in the patient’s history, excluding nonmelanoma skin cancer
Diabetes: Requiring treatment with insulin or oral hypoglycemic agents but not diet alone Rheumatologic: Systemic lupus erythematosus, rheumatoid arthritis, polymyositis, mixed connective tissue disease, or polymyalgia rheumatica Severe pulmonary: DLCO and/or FEV1 <65% or dyspnea at rest or requiring oxygen
Hepatic, mild: Chronic hepatitis, bilirubin > ULN or AST/ALT > ULN to 2.5 × ULN
Infection: Requiring continuation of antimicrobial treatment after day 0
Inflammatory bowel disease: Crohn disease or ulcerative colitis
Obesity: Body mass index >35 kg/m2
Psychiatric disturbance: Depression or anxiety requiring psychiatric consult or treatment

AST/ALT = aspartate aminotransferase/alanine aminotransferase; DLCO = diffusion capacity of carbon monoxide; FEV1 = forced expiratory volume in one second; ULN = upper limit of normal.

aAdapted from Sorror et al.[1]

bOne-or-more–vessel coronary artery stenosis requiring medical treatment, stent, or bypass graft.

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