Bipolar Disorder Test: Diagnosis, Screening and Criteria

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Bipolar disorder is a mental health condition that causes significant changes in mood, energy, activity, and behaviour. A person may have episodes of mania or hypomania and periods of depression. The pattern and severity of these episodes can vary from person to person.

Diagnosing bipolar disorder can sometimes be difficult because some symptoms overlap with conditions such as depression, anxiety, ADHD, and substance-related disorders. There is no single blood test or scan that can confirm bipolar disorder. Doctors usually make the diagnosis through a detailed psychiatric assessment, medical history, symptom review, and, when needed, tests to rule out other conditions.

What Is Bipolar Disorder?

Bipolar disorder is a mental health condition that causes episodes of unusually elevated or irritable mood and increased energy, as well as episodes of depression. These changes can affect sleep, relationships, work, education, and everyday activities.

There are different types of bipolar disorder. Bipolar I disorder involves at least one manic episode. Bipolar II disorder involves at least one hypomanic episode and one major depressive episode. A person with bipolar II does not have a history of a full manic episode.

What Are the Symptoms of Mania, Hypomania and Depression?

The symptoms can differ depending on the type of episode.

During mania or hypomania, a person may have:

Mania is more severe than hypomania and can cause major problems in daily life. It may require hospital care and can sometimes involve psychotic symptoms.

During a depressive episode, a person may experience:

What Are the Diagnostic Criteria for Bipolar Disorder?

The diagnostic criteria for bipolar disorder are described in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR), published by the American Psychiatric Association.

The diagnosis depends on the type of bipolar disorder and the person's symptoms and history.

A mental health professional uses these criteria along with the person's history rather than relying on a single test.

How Does a Clinical Assessment Help Diagnose Bipolar Disorder?

A detailed clinical assessment is an important part of diagnosing bipolar disorder. A psychiatrist or other qualified mental health professional may ask about:

With the person's permission, information from family members or close friends can sometimes help because a person may not recognise changes in their behaviour during a manic or hypomanic episode.

What Does a Mental Health Assessment for Bipolar Disorder Involve?

A mental health assessment may involve several steps. These can include a psychiatric interview, mental status examination, symptom questionnaires, and follow-up assessments over time.

The clinician may also assess whether symptoms could be caused by another mental health condition, medication, alcohol or drug use, or a medical problem.

What Assessment Scales Are Used for Bipolar Disorder?

Several questionnaires and rating scales can help clinicians assess bipolar symptoms. They are supporting tools and cannot confirm bipolar disorder on their own.

Commonly used tools include:

The MDQ and BSDS are mainly used to screen for symptoms associated with bipolar spectrum disorders. The YMRS is generally used by clinicians to measure the severity of manic symptoms.

What Diagnostic Tools Are Used for Bipolar Disorder?

There is no single test that can diagnose bipolar disorder. Doctors use different assessment methods to understand the person's symptoms and rule out other possible causes.

What Are Structured Clinical Interviews?

A structured clinical interview, such as the Structured Clinical Interview for DSM-5 Disorders (SCID-5), uses a standard set of questions based on established diagnostic criteria.

These interviews can help clinicians assess symptoms in a consistent way. However, the final diagnosis still depends on the clinician's overall assessment and the person's history.

Are There Screening Tests for Bipolar Disorder?

Screening questionnaires can help identify people who may need a more detailed assessment for bipolar disorder. Examples include the MDQ and Hypomania Checklist-32 (HCL-32).

A positive screening result does not mean that a person has bipolar disorder. It indicates that further evaluation may be appropriate.

Can a Blood Test Diagnose Bipolar Disorder?

No. There is currently no blood test that can confirm bipolar disorder.

However, doctors may recommend blood tests or other medical investigations when needed to rule out conditions that can cause similar symptoms. For example, thyroid problems, certain medication effects, substance use, or other medical conditions may affect mood, sleep, energy, or behaviour.

Blood tests may also be needed before or during certain bipolar disorder treatments to monitor health and medication safety.

Why Is an Accurate Bipolar Disorder Diagnosis Important?

An accurate diagnosis helps doctors choose an appropriate treatment plan. Bipolar disorder is treated differently from conditions such as major depressive disorder, so identifying the pattern of manic, hypomanic, and depressive episodes is important.

A correct diagnosis can also help a person understand their symptoms and recognise early changes in mood, sleep, energy, or behaviour.

What Makes Bipolar Disorder Difficult to Diagnose?

Bipolar disorder can be difficult to diagnose for several reasons.

For these reasons, doctors may need to assess symptoms over time rather than make a diagnosis from one appointment or questionnaire.

What Can Happen if Bipolar Disorder Is Misdiagnosed?

A wrong diagnosis can delay appropriate treatment and may lead to treatment that does not address the underlying condition. For example, treating bipolar depression requires consideration of the person's history of mania or hypomania when selecting medicines.

Some antidepressants can trigger mania or hypomania in certain people with bipolar disorder, particularly when used without an appropriate mood-stabilising treatment. However, treatment decisions are individual, and antidepressants may sometimes be used under close medical supervision.

A person should not stop or change psychiatric medication without speaking with their doctor.

What Happens After Bipolar Disorder Is Diagnosed?

After diagnosis, the doctor and patient can develop a treatment plan based on the person's symptoms, medical history, type of bipolar disorder, and treatment needs.

Treatment may include medication, psychotherapy, lifestyle measures, or a combination of these approaches. Regular follow-up is important because symptoms and treatment needs can change over time.

How Is Bipolar Disorder Treated and Managed?

Treatment may include:

Medicines should be taken exactly as prescribed. Do not change the dose or stop treatment without medical advice.

What Support Is Available for People With Bipolar Disorder?

Support from family, trusted friends, mental health professionals, and support groups can make it easier to manage bipolar disorder.

Learning about warning signs, keeping regular appointments, following the treatment plan, and tracking changes in mood and sleep may also help a person recognise changes early.

If a person has thoughts of suicide, self-harm, or feels unable to stay safe, urgent professional help should be sought.

Conclusion

Bipolar disorder is diagnosed through a careful assessment rather than a single medical test. Doctors consider the person's mood episodes, symptoms, medical history, behaviour, and how these changes affect daily life. Screening questionnaires can support the assessment, while blood tests may help rule out other causes.

Early and accurate diagnosis can help people receive appropriate treatment and learn how to manage changes in mood and behaviour. With suitable treatment and ongoing support, many people with bipolar disorder can manage their symptoms and lead fulfilling lives.