While there is no one blood test to detect schizophrenia, regular blood testing can provide important information about a person’s schizophrenia treatment and overall well-being.
Schizophrenia can affect many aspects of a person’s well-being, including their ability to regulate emotions and perceptions of the outside world. It is a complex psychiatric condition that can lead to hallucinations, paranoia, and other physical and mental health concerns.
People with schizophrenia may undergo a variety of tests during diagnosis and treatment, including blood tests. Understanding how all these tests fit into a schizophrenia care plan can be overwhelming if a medical professional does not explain them thoroughly. This may leave some people feeling frustrated and isolated.
This article focuses on understanding the role of blood tests in schizophrenia care, including what types of tests a person can expect to receive. It also examines emerging research on the use of blood tests to help support other aspects of schizophrenia care, including diagnosis and treatment.
Diagnosing schizophrenia can be complicated. At present, there is no blood test that can diagnose schizophrenia. A mental health professional, such as a psychiatrist, will typically diagnose the condition after carefully reviewing a person’s symptoms and medical history to determine whether schizophrenia is likely.
“We often do blood tests when people present with psychosis to check their overall health and rule out some disorders that can cause psychotic symptoms,” said Jennifer Zick, MD, PhD, a psychiatry resident at the University of Minnesota.
“Psychosis refers to symptoms like delusions, paranoia, and hallucinations,” she explained. “Psychosis can be present with several other psychiatric disorders, including depression and bipolar disorder, and it can be caused by substances, some medications, and other medical conditions.”
Using blood tests, psychiatrists can rule out other potential causes of psychosis and other mental health symptoms. This helps ensure that the symptoms a person is experiencing are due to schizophrenia and not to another cause.
A medical professional may also perform other types of testing during diagnosis, including cognitive testing and brain imaging. As with blood tests, none of these tests can definitively prove that a person has schizophrenia. However, the collective results from the tests can help psychiatrists create a clearer picture of what is happening in a person’s brain.
People receiving medication for schizophrenia commonly undergo regular blood testing during treatment.
“We often do blood tests to monitor the effects of medications that are used to treat schizophrenia,” said Dr. Zick. She explained that some types of medications can cause problematic side effects related to metabolic and immune health. These side effects include:
- weight gain
- insulin resistance
- hyperglycemia (high blood sugar)
- changes in lipid levels, such as high cholesterol
- changes in immune cell counts
For most people who are receiving antipsychotic medications, experts recommend blood testing for fasting glucose and lipid levels every 6–12 weeks. A doctor may also order a complete blood count to assess overall health.
These tests can help detect early changes to a person’s health and offer healthcare professionals an opportunity to intervene earlier if issues arise. Heart disease is among the
“We also may check the amount of a medication in someone’s blood in order to adjust the dose since everyone metabolizes medications differently, and sometimes the same dose can lead to different levels in different patients,” added Dr. Zick.
“It is called therapeutic drug monitoring, and it can help to determine if there is enough medication on board to be effective,” explained Leslie Citrome, MD, MPH, a clinical professor of psychiatry and behavioral sciences at New York Medical College. “Or, if levels are excessively high, the dose can be reduced.”
The precise cause of schizophrenia remains unclear. But in general, experts think the condition results from a combination of genetic and environmental factors and that genetics plays an important role in its development.
A person’s risk of developing schizophrenia is more than
Environmental factors that may play a role in the development of schizophrenia include:
- being born and raised in an urban area
- using cannabis
- having some types of infections
- experiencing complications during pregnancy
Experts use results from blood tests to better understand what causes schizophrenia. For instance, through these kinds of studies, researchers have found that inflammation is
By identifying specific molecules and cells linked to schizophrenia, scientists hope to one day better understand what causes the condition and, in turn, find potential ways to treat these underlying causes.
“The development of new biomarkers will be most useful if it gives us information on the types of treatments that may be helpful in the future,” Dr. Zick noted.
While such a test is not yet ready, some researchers are working to identify certain blood markers that can diagnose schizophrenia. Studies have examined a variety of potential biomarkers for schizophrenia,
- inflammatory molecules
- hormones
- energy metabolites
circulating cell-free DNA
It is unlikely that a test based on these factors will ever be able to diagnose schizophrenia on its own, but the hope is that a biomarker-based blood test could help psychiatrists diagnose schizophrenia faster and with greater confidence.
Other researchers are studying the use of blood-based markers to monitor response to schizophrenia medications, which could someday help support treatment decision making for people with schizophrenia.
Other types of testing may also support schizophrenia diagnosis and treatment in the future. Dr. Zick suggested that tests that measure activity within the brain, such as functional MRI and electroencephalography, could help researchers better understand how different parts of the brain communicate with each other.
“There have been many studies that indicate differences in the function of the brains of people with schizophrenia as compared to those without the disorder, and this may someday be useful for diagnosis,” she explained.
Below are some commonly asked questions about blood tests for schizophrenia.
Can blood tests diagnose schizophrenia?
Currently, there is no blood test that can diagnose schizophrenia. A mental health professional typically
However, researchers are working to identify certain blood markers that can help diagnose schizophrenia.
What lab tests are done for schizophrenia?
Healthcare professionals do not use one specific lab test for schizophrenia. However, they may use the following laboratory and radiographic tests to confirm a diagnosis:
- urea and electrolytes
- serum calcium
- blood glucose
- thyroid function tests
- 24-hour cortisol collection
- 24-hour catecholamine/5-HIAA collection
- urinary toxicology screen
- CT and MRI scans
- HIV/syphilis serology
These tests help healthcare professionals exclude other potential causes of psychiatric symptoms or neurologic impairment.
Can a blood test show mental illness?
At present, doctors cannot do a blood test to determine whether a person has a mental health condition.
However,
Blood testing is an important part of schizophrenia care. In combination with medical evaluation, it can help support decisions related to diagnosis and treatment.
“Diagnosis of schizophrenia, while it can be challenging when there are other potential causes of psychosis-like substance use, is not the hardest part of a psychiatrist’s job,” said Dr. Zick. “It’s much more challenging to effectively treat people’s symptoms while limiting side effects of the medications we use.”
Regular monitoring with blood tests can help psychiatrists protect the mental health of people with schizophrenia without compromising their overall well-being. In the future, some researchers hope to build on the ability of blood tests to support schizophrenia care, including by developing new treatments for this condition.