CRPS is diagnosed by using the “Budapest Criteria“.
Note: Early after trauma it may not be possible to diagnose CRPS, because features in the limb which are typical early after trauma can look like CRPS (such as swelling, warmth, pain). If CRPS is not present, then these features will quickly resolve. The good news is that even if you’re not sure whether what you see is normal after trauma, or whether it is CRPS, the initial treatment remains the same.
How much can I rely on symptoms only?