What is the treatment ascent rate for both TT5 and TT6?

The treatment ascent rate for both TT5 (Treatment Table 5) and TT6 (Treatment Table 6) is set at 20 ft/min. This rate is critical in the context of decompression procedures following a dive, particularly in managing oxygen exposure and minimizing the risk of decompression sickness (DCS).

By adhering to a defined ascent rate, divers can safely off-gas nitrogen that has been absorbed into their tissues during the dive. Ascent rates are carefully prescribed in treatment tables to ensure that divers achieve a safe return to the surface while reducing the chance of inert gas bubbles forming in the bloodstream. The 20 ft/min ascent rate balances the need for a gradual ascent that allows for proper off-gassing while also providing an effective pace for moving through the various levels of pressure during treatment. This standardization facilitates compliance and safety, particularly in emergency scenarios, ensuring that all personnel receiving treatment follow the same proven protocols.

In contrast, higher ascent rates would increase the risk of experiencing DCS, while lower rates could unnecessarily prolong the treatment process, thus making 20 ft/min the established standard for TT5 and TT6.