Most people I've met here really don't need a test to tell them whether they're depressed or not, and I don't know how well this works for Bipolar, but thought it might be of interest to a few. This test claims to predict the onset of depression based on answers to questions. It's not the typical Internet test; it's my understanding they built the test using a sampling of 5000 people and refined the questions with another sample of almost 2000 people.
http://www.ucl.ac.uk/predict-depression/Description from the site:
Welcome to the predictD website. The questions on this website have been developed as a tool for predicting risk of depression in the future. Risk estimates of this type have been developed in medicine to predict risk of major medical disorders such as heart attacks and strokes. This is the first tool of its type to predict onset of depression.
If you complete the questions that follow we will be able to estimate your risk of developing major depression in the coming 12 months. The questions have arisen from a large study that was conducted in Europe and South America. Details of the study have been published in the December 2008 edition of Archives of General Psychiatry.
The questions are designed for people who are NOT depressed at present. If you would like to take part you will first be asked to complete a number of questions about your current mood and then, depending on your responses, you will proceed to the predictD risk assessment, which will estimate your risk of developing depression in the coming year.
So, yeah, maybe not all that useful for people here that are already depressed, but maybe interesting nonetheless.
