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Obsessive Compulsive Disorder (OCD) Test
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lab Tests

Obsessive Compulsive Disorder (OCD) Test

An obsessive-compulsive disorder (OCD) test helps determine if specific symptoms are caused by OCD or a physical condition, ensuring you receive the appropriate treatment to improve your quality of life.

Overview

OCD is a type of anxiety disorder. People with OCD may experience obsessions, compulsions, or both:

  • Obsessions are repeated unwanted thoughts, urges, or images that can cause distress or anxiety.
  • Compulsions are behaviors that you feel like you need to do over and over to try to reduce your anxiety or stop the obsessive thoughts.

Unlike regular habits, compulsive behaviors in OCD usually take up more than an hour a day. You may feel frustrated or embarrassed by these behaviors but feel unable to stop them. Stress may worsen these behaviors, which can interfere with daily responsibilities and reduce your quality of life. While the exact cause is unknown, researchers believe genetics, brain biology and chemistry, and environment play a role.

What is it used for?

This test is used to find out if certain symptoms are being caused by OCD.

Why do I need an OCD test?

This test may be done if you or your child is having obsessive thoughts or showing compulsive behaviors. Common obsessions include:

  • Fear of germs or contamination
  • Fear that harm will come to yourself or your loved ones
  • An overwhelming need for neatness and order
  • Constant worries that you've left something undone, like the stove on or the door unlocked
  • Fear of losing or misplacing something
  • Fear of losing control over your behavior
  • Forbidden thoughts or images involving sex or religion
  • Aggressive thoughts toward yourself or others

Common compulsions include:

  • Repeated hand washing, often until chapped or sore
  • Checking and rechecking that appliances and lights are turned off or that the door is locked
  • Ordering or arranging items in a particular way
  • Repeating certain actions, such as sitting down and getting up from a chair
  • Constantly cleaning
  • Repeatedly checking buttons and zippers on clothing
  • Counting in a certain pattern over and over

What happens during an OCD test?

Your health care provider may perform a physical exam and order blood tests to rule out other causes, such as medications, other mental illnesses, or physical disorders. If you see a mental health provider, they may ask detailed questions about your thoughts and behaviors or have you fill out a series of questionnaires.

Will I need to do anything to prepare?

You do not need any special preparations for an OCD test.

Are there any risks?

There is no risk to having a physical exam or filling out questionnaires. Blood tests carry very little risk, such as slight pain or bruising at the needle site, which typically resolves quickly.

What do the results mean?

Your provider will consider your symptoms, medical history, and other test results to reach a diagnosis. Symptoms are generally considered to be OCD when:

  • The thoughts or behaviors take up an hour or more of your day
  • You cannot control your excessive thoughts and behaviors
  • The behaviors provide some relief from anxiety, but you do not enjoy performing them
  • The thoughts and behaviors interfere with personal relationships, work, and other important parts of daily life
  • They are not caused by a substance use disorder

Treatment for OCD usually includes talk therapy (such as Cognitive-behavioral therapy or CBT), other mental health counseling, or medications such as certain types of antidepressants.

Is there anything else I need to know?

If diagnosed, you may be referred to a mental health provider, such as a psychiatrist, psychologist, advanced practice registered nurse (APRN), certified nurse practitioner (CNP), clinical nurse specialist (CNS), licensed clinical social worker, or licensed professional counselor.

Frequently Asked Questions

First‑line therapy combines cognitive‑behavioral therapy with exposure and response prevention (ERP) and a selective serotonin reuptake inhibitor (SSRI) such as fluoxetine or sertraline. Many patients report a reduction in anxiety and compulsive urges within 4–6 weeks of starting an SSRI, while ERP typically shows measurable benefit after 8–12 sessions. Early improvement often predicts longer‑term success.
high screening score signals that further evaluation is warranted, but it does not alone confirm OCD. A qualified mental‑health professional must conduct a comprehensive clinical interview, assess functional impairment, and rule out other conditions (e.g., ADHD, autism, tic disorders) before making a formal diagnosis.
Thyroid dysfunction, Wilson’s disease, certain infections, and side‑effects of stimulant or antipsychotic medications can produce intrusive thoughts or repetitive behaviors. The OCD assessment focuses on the content, purpose, and distress of the thoughts/behaviors, and clinicians often order basic labs (TSH, copper studies) or medication reviews to exclude medical mimics before confirming OCD.
Clinicians typically use structured interviews (e.g., the Yale‑Brown Obsessive Compulsive Scale) and self‑report questionnaires (e.g., OCI‑R, CY‑BOCS for children). The interview portion lasts 30–60 minutes, while questionnaires take 10–15 minutes to complete. Together they provide a severity score and help differentiate OCD from other anxiety disorders.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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