T45 is disability sport classification in disability athletics for people with double above or below the elbow amputations, or a similar disability. The class includes people who are ISOD classes A5 and A7. The nature of the disability of people in this class can make them prone to overuse injuries. The classification process to be included in this class has four parts: a medical exam, observation during training, observation during competition and then being classified into this class.

This classification is for disability athletics. This classification is one of several classifications for athletes with ambulant related disabilities. Similar classifications are T40, T42, T43, T44, T45 and T46. Jane Buckley, writing for the Sporting Wheelies, describes the athletes in this classification as: "Double above elbow or double below elbow amputations or similar disability." The International Paralympic Committee defined this in 2011 as: "Athletes with BILATERAL upper limb impairment where BOTH limbs meet the relevant unilateral criteria described for upper limb deficiency (Section 4.1.4.b.i), impaired upper limb ROM (Section 4.1.5.c.i) or impaired upper limb muscle power (Section 4.1.6.c.i) may compete in this class for all running and jumping events." The International Paralympic Committee defined this classification on their website in July 2016 as, "Upper limb/s affected by limb deficiency, impaired muscle power or impaired range of movement".

This class includes people from the ISOD A5 and A7 classes.

For A5 and A7 competitors in this class, the nature of a person's amputations in this class can effect their physiology and sports performance. Because they are missing a limb, amputees are more prone to overuse injuries in their remaining limbs. Common problems for intact upper limbs for people in this class include rotator cuffs tearing, shoulder impingement, epicondylitis and peripheral nerve entrapment.

A study of was done comparing the performance of athletics competitors at the 1984 Summer Paralympics. It found there was no significant difference in performance in times between women in A6, A7 and A8 in the discus, women in A6, A7 and A8 in the shot put, women in the A6, A7 and A8 in the long jump, women in A6, A7 and A8 in the 100 meter race, women in A5, A6, A7 and A8 in the 100 meter race, men in the A3, A4, A5, A6, A7, A8 and A9 in the discus, men in A6, A7 and A8 in the discus, men in A1, A2, A3, A4, A5, A6, A7, A8 and A9 in the javelin, men in A6, A7 and A8 in the javelin, men in A6, A7 and A8 in the high jump, men in A5, A6 and A7 in the long jump, men in A6, A7 and A8 in the long jump, men in A6, A7 and A8 in the 100 meter race, men in A5, A6 and A7 in the 100 meter race, men in A6 and A7 in the 400 meter race, men in A5, A6 and A7 in the 400 meter race, men in A7 and A8 in the 400 meter race, men in A6 and A7 in the 1,500 meter race, and men in A7 and A8 in the 1,500 meter race.

People in this class are not required to use a starting block. They have an option to start from a standing position, a crouch or a 3-point stance. In relay events involving T40s classes, no baton is used. Instead, a handoff takes place via touch in the exchange zone.

People with arm amputations in this class can have elevated padded blocks to place their stumps on for the start of the race. These blocks need to be in a neutral color or a color similar to that of the track, and they must be placed entirely behind the starting line. Their location needs to be such that they do not interfere with the start of any other athlete.

In field events for this class, athletes are not required to wear a prosthetic. In jumping events, athletes have 60 seconds during which they must complete their jump. During this time, they can adjust their prosthetic. If during a jump, the athlete's prosthesis falls off, the jump length start should start from where the takeoff board and the distance is where the prosthesis fell off. If prosthesis falls off outside the landing zone nearer the board than where athlete landed, the jump counts as a foul.