The main ways to test for diastasis recti include color ultrasound, CT, self-examination, and MRI. 1. Ultrasound: Ultrasound measures the distance between the inner edges of the rectus abdominis muscle and the shape of the rectus abdominis muscle to evaluate whether there is a separation of the rectus abdominis muscle. 2. CT examination: It is possible to determine whether the rectus abdominis muscle is separated by observing the rectus abdominis muscle on both sides of the abdomen away from the middle position through abdominal CT. 3. Self-examination: For example, if the shape of the stomach recovers after lying down, and the abdomen protrudes forward after standing up, the separation of the rectus abdominis muscle is highly suspected. 4. Nuclear magnetic resonance examination (NMR): It is also used to observe the position of the muscles on both sides of the abdomen to determine whether the rectus abdominis muscle is separated or not, but the cost of NMR is relatively high compared to other examinations. If you suspect that the rectus abdominis muscle is separated after delivery, it is best to go to the hospital for examination to make sure, and if so, you can have the rectus abdominis muscle repaired and treated as soon as possible.