The 5-point scale for the assessment of interim FDG-PET scans
| 1 | No uptake |
| 2 | Uptake less than or equal to mediastinum |
| 3 | Uptake greater than mediastinum but less than or equal to liver |
| 4 | Moderately increased uptake compared with liver |
| 5 | Markedly increased uptake compared with liver and/or new lesions |
| X | New areas of uptake unlikely to be related to lymphoma |
| 1 | No uptake |
| 2 | Uptake less than or equal to mediastinum |
| 3 | Uptake greater than mediastinum but less than or equal to liver |
| 4 | Moderately increased uptake compared with liver |
| 5 | Markedly increased uptake compared with liver and/or new lesions |
| X | New areas of uptake unlikely to be related to lymphoma |