Since my initial visit to the ER with hemoptysis, I have not been back. However the frequency of its occurrence increased over 3 1/2 yrs until my pulmonologist was ready to treat me. When the ID Dr. did not recommend treatment due to my otherwise good condition, I waited & it stopped for about 6 months. Now it is very infrequent perhaps due to using 7% sodium chloride and/or due to the removal of a litter box—both of which occurred around the same time. It’s hard for me to estimate the amount of blood at first occurrence, but perhaps a tablespoon or 2. Take care.