Identifying if somebody is having this disorder is a job psychiatrists are good at. However, before resorting for professional help, one can look for initial symptoms.
If you suspect your friend or loved one is having this disorder, take note of his moods. People with BPD tend to feel high at one moment, and quickly feels low at another. Also, look for the signs of impulsivity. Usually, a person with BPD is impulsive about money, sex or substance abuse.
Since self-image is a great issue in BPD, think of how the person sees himself. If there are signs of unjustified self-image distortion then maybe that person has the disorder. This is manifested if he feels unworthiness and restlessness evident by frequent change of jobs, partners, goals and value system.
Test the person’s reaction on simple undertakings. In example, if you go on a trip without him, does he burst out of anger and get depressed automatically? In this way you are gauging his “attachment issues.” Apart from that, you are testing the person’s anger management. People with BPD often get intensely angry in situations that don’t even require them to be. The worse, they may even get emotionally, verbally and physically abusive.
Above anything else, it must be put in mind that like any other disorder, what BPD sufferers need is understanding.