After scuba diving with a controlled ascent, what is the recommended waiting time before flying to cabin pressure altitudes of 8,000 feet or less?

The recommendation of waiting 24 hours after scuba diving before flying to altitudes of 8,000 feet or less is based on the need to minimize the risk of decompression sickness, also known as "the bends." During scuba diving, divers are exposed to increased atmospheric pressure, which allows more nitrogen to dissolve in their tissues. If a diver ascends too quickly or does not allow sufficient time for their body to eliminate the excess nitrogen, flying shortly afterward could lead to the formation of nitrogen bubbles in the bloodstream when subjected to lower pressures at altitude.

The 24-hour waiting period provides a buffer for the body to expel the dissolved nitrogen, significantly reducing the risk of decompression sickness. This guideline is widely accepted among aviation and diving communities to ensure the safety of individuals who engage in both activities. While some might consider other waiting times, 24 hours is the standard recommended to ensure adequate safety, allowing for a thorough clearance of nitrogen from the body.