Free online screening questionnaires for Obsessive Compulsive Disorder can be found at psychcentral.com and ocdaction.org.uk. No online test can diagnose OCD, but it can help individuals decide if they should seek help.
If individuals or their dependants feel they might be at risk for obsessive compulsive disorder it's best to contact a family doctor or mental health professional. OCD can manifest as repeated physical behaviors, called rituals, or mentally as repeated thoughts or images. Both the thoughts and rituals are uncontrollable. Common themes include cleanliness, fears of ill health, germs or intruders, thoughts of injuring others or conflicts of religious beliefs.