Hemoptysis is said to be massive when it exceeds what amount in 24hours?
Massive hemoptysis is generally defined as expectoration of over 600 mL of blood within a 24hour period. It is a medical emergency associated with a moality rate of 30 to 50%. Ref: Harrison; 20th edition pg 233
400mL
500mL
600mL
800mL
Respiratory system