Key Takeaways
- Bipolar disorder is diagnosed from your history: whether you have had a manic or hypomanic episode, how long it lasted and what else could explain it.
- No blood test, brain scan or genetic test can diagnose bipolar disorder; lab work is used to rule out causes such as thyroid disease or substances.
- Input from people who know you, a timeline of past episodes and validated rating scales all strengthen the picture.
- Diagnosis is often delayed by years, mostly because people seek help during depression and the highs go unreported.
- A board-certified psychiatric-mental health nurse practitioner can evaluate, diagnose and treat bipolar disorder.
Bipolar disorder is diagnosed by a clinician who takes a careful history, not by a lab result. The central question is whether you have ever had a manic or hypomanic episode: a stretch of elevated or irritable mood with more energy that lasted days, not hours. Everything else in the evaluation either fills in that history (your own account, input from people who know you, a timeline, rating scales) or rules out other explanations (thyroid problems, substances, medications and conditions that look similar). Here is what each step involves, why it often takes time, and who can make the diagnosis.
What a clinician has to establish
Clinicians in the United States use the criteria in the DSM-5-TR. As summarized by the American Psychiatric Association and the Merck Manual, the key episode definitions are:
| Episode | Core features | Minimum length |
|---|---|---|
| Manic | Abnormally elevated, expansive or irritable mood plus increased activity or energy, with at least three other symptoms (four if the mood is only irritable) | One week, or any length if hospital care is needed |
| Hypomanic | The same kinds of symptoms, noticeable to others, without psychosis, marked impairment or hospitalization | Four days in a row |
| Major depressive | Low mood or loss of interest with other depressive symptoms | Two weeks |
Bipolar I requires at least one manic episode. Bipolar II requires at least one hypomanic episode and at least one major depressive episode, with no mania ever. Cyclothymia and "other specified" forms cover patterns that do not reach full episodes. The bipolar disorder guide explains each type. The evaluation is the work of matching your actual history to these definitions, and of making sure nothing else explains it better.
Step 1: Your mood history
Most of the visit is conversation. Expect questions that go back years, not just weeks:
- When your mood problems first began, and whether they come in distinct stretches or have been fairly constant.
- Whether there were ever periods when you needed much less sleep, had unusual energy, talked or thought faster, or took risks that were out of character.
- How long those periods lasted, how often they have happened and what they cost you.
- Depressive episodes: their length, severity and any thoughts of suicide.
- What treatments you have tried, and how you responded, including any antidepressant that left you agitated or sleepless.
- Family history of bipolar disorder, depression, suicide or substance use.
- Alcohol, cannabis and other drug use, current medications and medical conditions.
People usually seek care when they are low, so a clinician will ask about the highs directly. Our page on whether it is depression or bipolar disorder explains why that question matters before an antidepressant is started.
Step 2: Input from people who know you
The American Psychiatric Association describes the behavior changes of a manic episode as ones that are clear to friends and family. That is useful, because hypomania in particular can feel like simply being productive or confident from the inside. A partner, parent or close friend may remember the weekend you did not sleep, the spending, or the week you could not stop talking.
With your permission, a clinician may invite someone to join part of the visit or share observations in writing. You decide who is involved and what is shared. If no one is available, a detailed personal timeline helps fill the gap.
Step 3: A timeline, or life chart
A life chart maps your mood over the years: episodes, their length, life events around them, treatments and how each one went. It turns scattered memories into a pattern, and it often reveals that a depression was preceded by a high stretch, or that episodes cluster around sleep loss or particular seasons.
NIMH recommends keeping a life chart or mood journal, and going forward, a daily record of mood, sleep and energy shows changes in real time. Our free bipolar mood chart is a simple way to begin before your appointment. When the history is unclear, a clinician may suggest tracking for several weeks and reviewing the record together before settling on a diagnosis.
Step 4: Rating scales
Standardized questionnaires add structure. Some screen for past hypomania or mania, such as the Mood Disorder Questionnaire, the Hypomania Checklist and the Bipolar Spectrum Diagnostic Scale. Others measure how severe current depressive or manic symptoms are, which also helps track treatment later.
Guidelines are clear about their role. The 2023 VA/DoD guideline suggests using a validated instrument in specialty mental health care to support decisions about the diagnosis, and NICE advises against relying on questionnaires in primary care to identify bipolar disorder. A score is one input among several, never the answer. If you would like to reflect on your own history before a visit, our bipolar self-check is a plain-language starting point.
Step 5: Ruling out other causes
NIMH is explicit that no blood test or brain scan can diagnose bipolar disorder, and no genetic test can either. Tests are used to rule out other causes of mood symptoms. Common considerations include:
- Thyroid disease. An overactive thyroid can produce restlessness, poor sleep and elevated or irritable mood; thyroid tests such as TSH and T4 are commonly checked.
- Substances. Stimulants and other recreational or illicit drugs, and alcohol, can mimic or worsen mood symptoms.
- Medications. Corticosteroids and dopamine agonists are among the prescriptions known to trigger elevated states.
- Other psychiatric conditions. NICE lists schizophrenia spectrum disorders, personality disorders, substance and alcohol use disorders and ADHD among the differential diagnoses to consider.
Which labs make sense depends on your history and what has already been checked; they are ordered as needed. Our page on lab work in bipolar care covers both the rule-out tests and the monitoring some medications require. Pharmacogenomic testing does not diagnose bipolar disorder; see pharmacogenomic testing in bipolar disorder for what it can and cannot show.
Why the diagnosis often takes years
A meta-analysis of 27 studies found an average gap of 5.8 years between the onset of bipolar disorder and its management, and the VA/DoD guideline cites delays of up to 14.5 years. In one survey of 600 people with bipolar disorder, 69% said they had first been misdiagnosed, most often with depression; the sample came from support groups, so it may not represent everyone.
The reasons are understandable. Depressive episodes in bipolar disorder look much like ordinary depression, and the VA/DoD guideline notes they cannot be told apart by their features alone. Hypomania is often remembered as a good stretch. Substance use and other conditions blur the picture. A diagnosis can also change as more history emerges, which is why some people seek a bipolar second opinion after years of treatment that has not fit.
Who can diagnose bipolar disorder?
Psychiatrists and psychiatric-mental health nurse practitioners (PMHNPs) diagnose and treat bipolar disorder, including prescribing mood stabilizers. Primary care clinicians often recognize the possibility and refer. Psychologists and other licensed mental health professionals also assess mood disorders and often work alongside a prescriber.
At Willow & Stone, Dr. Stacey Forbes, DNP, APRN, PMHNP-BC, a board-certified psychiatric-mental health nurse practitioner, provides the evaluation. The first visit is a 90-minute integrative psychiatric evaluation ($300), in person in Arlington, Texas or by telehealth for people physically located in Texas, New Mexico, Florida, Alaska, Arizona, Colorado or Washington at the time of the visit. Insurance is accepted only for Texas patients, depending on the plan; outside Texas, visits are direct-pay with a superbill. Willow & Stone provides outpatient, scheduled care and is not an emergency service. You can read more about bipolar disorder treatment at Willow & Stone or book a consultation.
Common Questions
Is there a blood test for bipolar disorder?
No. NIMH states that no blood test or brain scan can diagnose bipolar disorder. Blood tests are used to rule out other causes of mood symptoms, such as thyroid disease or substances, and later to monitor certain medications. The diagnosis itself rests on your history and a clinical evaluation.
How long does it take to diagnose bipolar disorder?
Sometimes one thorough evaluation is enough, when there is a clear history of a manic or hypomanic episode. When the past is hazy or other conditions overlap, a clinician may track your mood for several weeks, gather input from family, or review records before deciding. Getting it right matters more than getting it fast.
Can a nurse practitioner diagnose bipolar disorder?
Yes. A psychiatric-mental health nurse practitioner (PMHNP) is trained and licensed to evaluate, diagnose and treat psychiatric conditions, including bipolar disorder, and to prescribe medications such as mood stabilizers. Board certification, such as PMHNP-BC, confirms specialty training in psychiatric care.
Can bipolar disorder be diagnosed by telehealth?
Yes, for many people. The evaluation is mostly a detailed conversation, which works well by video. Lab tests, when needed, are done at an outside lab. Telehealth is not appropriate during a crisis such as severe mania or psychosis, when emergency or in-person care comes first.
Can I be diagnosed while I am depressed?
Yes. Most people are evaluated during depression. The diagnosis depends on whether you have had a manic or hypomanic episode in the past, so the clinician will ask about earlier high periods. Bringing someone who remembers those times, or notes about them, helps a great deal.
What should I bring to a bipolar evaluation?
A list of current and past medications and how each worked, any previous diagnoses or records, a rough timeline of high and low periods, notes on sleep, and family history of mood disorders or suicide. If someone close to you can share observations, ask whether they can join or write them down.
Part of our bipolar disorder guide
Sources & Further Reading
- NIMH: Bipolar Disorder in Children and Teens (NIH Pub. 23-MH-8081)
- NIMH: Bipolar Disorder (NIH Pub. 25-MH-8088, revised 2025)
- American Psychiatric Association: What Are Bipolar Disorders? (reviewed April 2024)
- Merck Manual Professional: Bipolar Disorders (reviewed 2026)
- NICE CG185: Bipolar disorder, assessment and management (last updated 2 Sept 2025)
- VA/DoD Clinical Practice Guideline for the Management of Bipolar Disorder (2023)
- Dagani J et al. Meta-analysis of the interval between onset and management of bipolar disorder. Can J Psychiatry 2017
- Hirschfeld RMA et al. Perceptions and impact of bipolar disorder: 2000 NDMDA survey. J Clin Psychiatry 2003
This article is general education, not a diagnosis or advice for your situation. Do not start, stop, or change a medication without talking to the clinician who prescribes it; stopping a mood stabilizer suddenly can trigger relapse.
If you need help right now
Willow & Stone is an outpatient practice and is not an emergency service. If you or someone you care about is in immediate danger, call 911.
For urgent mental health support at any hour, call or text 988 to reach the Suicide & Crisis Lifeline, or text HOME to 741741 for the Crisis Text Line. Both are free, confidential, and available 24/7 nationwide.
Dr. Stacey Forbes, DNP, APRN, PMHNP-BC
Board-certified Psychiatric-Mental Health Nurse Practitioner and founder of Willow & Stone Integrative Mental Health. Nearly two decades of clinical experience; integrative, root-cause psychiatry in person in Arlington and by telehealth. Licensed in Texas, New Mexico, Florida, Alaska, Arizona, Colorado & Washington.
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