Context: CREATE TABLE table_1226250_1 (partial_thromboplastin_time VARCHAR, bleeding_time VARCHAR, prothrombin_time VARCHAR)
Question: How long does thromboplastin last when prothrombin is unaffected?
Answer: SELECT partial_thromboplastin_time FROM table_1226250_1 WHERE bleeding_time = "Unaffected" AND prothrombin_time = "Unaffected"