Two questions or nine? If you have come across both the PHQ-2 and the PHQ-9, they can look like the same test at different lengths. They are related, but they do different jobs, and knowing which to use saves time.
Both come from the Patient Health Questionnaire family and screen for depression. The short version of PHQ-2 vs PHQ-9: the PHQ-2 is a quick first filter, and the PHQ-9 is the fuller screen you move to when the first one flags something. You can take the free PHQ-2 or the full PHQ-9 in a couple of minutes each.
What the PHQ-2 does
The PHQ-2 asks two things about the last two weeks: how often you have had little interest or pleasure in doing things, and how often you have felt down, depressed, or hopeless. Each is scored 0 to 3, for a total of 0 to 6.
A score of 3 or more is the usual cut-off for a positive screen. That does not mean you have depression. It means a closer look is worth it. The PHQ-2 is built for speed, for a waiting room or a fast self-check, not for measuring how severe things are.
What the PHQ-9 adds
The PHQ-9 keeps those two questions and adds seven more, covering sleep, appetite, energy, concentration, how you feel about yourself, and thoughts of self-harm. Each is scored 0 to 3, for a total of 0 to 27.
That extra detail is the point. The PHQ-9 does not just say "maybe" or "no." It sorts scores into bands, from minimal to severe, so you get a sense of degree. It also asks directly about self-harm, which the PHQ-2 skips. That is an important reason the longer version matters once the short one is positive.
Reading the PHQ-9 bands
Roughly, a PHQ-9 total of 0 to 4 is minimal, 5 to 9 mild, 10 to 14 moderate, 15 to 19 moderately severe, and 20 to 27 severe. Higher is not a verdict; it is a signal about how much support might help. Many clinicians treat a score of 10 or above as the point where follow-up is clearly worth it.
Which one should you take?
If you just want a fast gut-check, start with the PHQ-2. If it comes back positive, or if you already know you have been struggling and want more detail, go straight to the PHQ-9. There is no harm in taking the longer one first, since it contains the short one inside it.
If you are also worried about anxiety, the PHQ-4 combines a two-item depression check with a two-item anxiety check in four questions, a handy all-in-one first pass.
What a score is, and is not
Neither test diagnoses depression. They are screens. A high score tells you something is worth attention and gives you words and numbers to bring to a professional. A low score does not rule everything out, especially if you feel off in ways the questions do not capture.
The practical move: take the screen that fits your moment, write down the result, and retake it in a few weeks to see which way things are heading. If your score is high, or you have any thoughts of harming yourself, talk to a doctor or contact a crisis line now.