Getting tested for depression typically starts with a short questionnaire at your doctor’s office, followed by a conversation about your symptoms and how long they’ve lasted. You don’t need a psychiatrist or a specialist referral to begin. Most primary care physicians can screen for and diagnose depression in a single visit.
What Happens During a Depression Screening
The most widely used screening tool is the PHQ-9, a nine-question form you fill out yourself. Each question asks how often you’ve experienced a specific symptom over the past two weeks, and you rate each one from “not at all” to “nearly every day.” Your answers produce a score between 0 and 27:
- 0 to 4: Minimal or no depression
- 5 to 9: Mild depression
- 10 to 14: Moderate depression
- 15 to 19: Moderately severe depression
- 20 to 27: Severe depression
A positive screening result is not the same as a diagnosis. It flags that something needs a closer look. Patients who score positively still need a clinical evaluation to confirm depression and rule out other explanations for their symptoms, whether that’s normal grief, stress, or a physical health problem.
Who Can Diagnose You
Your primary care doctor is often the best starting point. Family physicians, internists, and general practitioners are trained to evaluate depression and can diagnose it during a routine office visit. Many clinics now treat depression screening the same way they treat blood pressure checks: as a standard part of care.
If your case is complex, if a first treatment isn’t working, or if you have other mental health conditions alongside depression, your doctor may refer you to a psychiatrist. Psychologists and licensed clinical social workers can also evaluate depression, though prescribing medication requires a physician or psychiatric nurse practitioner. For most people, though, the path to a diagnosis runs straight through their regular doctor’s office.
The Clinical Interview
The screening questionnaire opens the door. The clinical interview is where the actual diagnosis happens. Your doctor will ask about the timeline of your symptoms: when they started, whether they’ve been continuous or come and go, and what might have triggered them. They’ll ask about your sleep, appetite, energy level, and ability to concentrate. They’ll want to know about your family history of depression or other mental health conditions, any medications you’re currently taking, and whether you’ve had thoughts of self-harm.
This conversation usually takes 15 to 30 minutes. It can feel uncomfortable to talk openly about how you’ve been feeling, but specifics matter here. The more concrete you can be about what’s changed in your daily life and when, the more accurate the evaluation will be. If you find it hard to articulate your symptoms on the spot, writing down notes beforehand can help.
The Nine Symptoms Doctors Look For
A formal diagnosis of major depressive disorder requires at least five of the following nine symptoms, present most of the day, nearly every day, for at least two consecutive weeks. At least one of the first two symptoms must be on the list:
- Depressed mood: Feeling sad, empty, or hopeless for most of the day
- Loss of interest: No longer caring about activities you used to enjoy
- Weight or appetite changes: Significant unintentional weight loss or gain (more than 5% of body weight in a month), or a noticeable shift in appetite
- Sleep problems: Sleeping too much or too little
- Visible restlessness or slowness: Moving or speaking noticeably slower, or being unable to sit still, to a degree that others can observe
- Fatigue: Persistent tiredness or low energy, even with rest
- Worthlessness or guilt: Feeling worthless or excessively guilty in ways that go beyond normal self-criticism
- Trouble thinking: Difficulty concentrating, remembering things, or making decisions
- Thoughts of death: Recurring thoughts about death or suicide, not just a fear of dying
The two-week minimum is important. Everyone has bad days or rough stretches. What separates clinical depression from temporary sadness is that the symptoms persist, dominate most of the day, and interfere with your ability to function normally.
Blood Tests to Rule Out Other Causes
Depression symptoms can overlap with several medical conditions, so your doctor will likely order blood work as part of the evaluation. An underactive thyroid, for instance, can cause fatigue, weight gain, difficulty concentrating, and low mood, all of which look identical to depression. A complete blood count can reveal anemia or infection. Vitamin deficiencies, particularly vitamin D and B12, are also known to affect mood and energy.
These tests don’t diagnose depression directly. There is no blood marker for it. Instead, they eliminate other explanations. If your thyroid is functioning normally and your bloodwork comes back clean, your doctor can be more confident that your symptoms are psychiatric rather than medical in origin.
Screening for Postpartum Depression
New and expecting mothers are typically screened with a different tool called the Edinburgh Postnatal Depression Scale (EPDS), a 10-question self-report form covering the past seven days. A score of 13 or higher is the standard threshold for identifying women at risk for major postpartum depression. At that cutoff, about 86% of women who score positive are later confirmed to have major or minor depression through a full diagnostic interview.
During pregnancy, the recommended threshold is slightly higher, at 15 or above, because some symptoms that overlap with normal pregnancy discomfort (like fatigue and sleep changes) can inflate scores. If you score above the cutoff at any point, your provider will schedule a follow-up visit sooner than the standard postpartum timeline to review your mood and plan next steps.
What to Expect After a Diagnosis
If your doctor confirms depression, the conversation shifts to treatment options. For mild to moderate depression, this often means therapy, medication, or both. Cognitive behavioral therapy and interpersonal therapy have the strongest track records. Your doctor may start treatment directly or refer you to a therapist or psychiatrist depending on severity.
Many people worry that seeking a diagnosis will lead to being immediately placed on medication. In practice, your doctor will discuss options with you and factor in your preferences, the severity of your symptoms, and your history. Treatment is a collaboration, not a mandate. What matters most is that the evaluation happens, because depression responds well to treatment when it’s identified, and tends to worsen when it isn’t.
How to Prepare for Your Appointment
You can take the PHQ-9 online before your visit to get a rough sense of where you fall, but the official evaluation needs to happen with a provider. When you call to schedule, you can simply say you’d like to be evaluated for depression. Most offices will book a slightly longer appointment to allow time for the conversation.
Before you go, it helps to think through a few things: how long you’ve been feeling this way, whether anything specific triggered the change, whether depression runs in your family, what medications or supplements you take, and how your symptoms are affecting your work, relationships, or daily routine. Having these details ready makes the visit more productive and helps your doctor distinguish between depression and other conditions that share similar symptoms.