Health
Blood tests for Alzheimer's may be coming to your doctor's office: What to know
- New blood tests show promise for faster and more accurate diagnosis of Alzheimer’s disease, medical researchers say.
- Many current Alzheimer’s diagnoses are based on symptoms and cognitive exams, but blood tests could offer a simpler alternative.
- Blood tests measuring p-tau217, a biomarker associated with Alzheimer’s, are expected to become more prominent as FDA guidelines are established.
New blood tests could help doctors diagnose Alzheimer’s disease faster and more accurately, researchers reported Sunday – but some appear to work far better than others.
It’s tricky to tell if memory problems are caused by Alzheimer’s. That requires confirming one of the disease’s hallmark signs — buildup of a sticky protein called beta-amyloid — with a hard-to-get brain scan or uncomfortable spinal tap. Many patients instead are diagnosed based on symptoms and cognitive exams.
Labs have begun offering a variety of tests that can detect certain signs of Alzheimer’s in blood. Scientists are excited by their potential but the tests aren’t widely used yet because there’s little data to guide doctors about which kind to order and when. The U.S. Food and Drug Administration hasn’t formally approved any of them and there’s little insurance coverage.
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“What tests can we trust?” asked Dr. Suzanne Schindler, a neurologist at Washington University in St. Louis who’s part of a research project examining that. While some are very accurate, “other tests are not much better than a flip of a coin.”
A doctor points to PET scan results that were part of a study on Alzheimer’s disease at Georgetown University Hospital, on May 19, 2015, in Washington. New blood tests could help doctors diagnose Alzheimer’s disease faster and more accurately, researchers reported on Sunday. (AP Photo/Evan Vucci, File)
Demand for earlier Alzheimer’s diagnosis is increasing
More than 6 million people in the United States and millions more around the world have Alzheimer’s, the most common form of dementia. Its telltale “biomarkers” are brain-clogging amyloid plaques and abnormal tau protein that leads to neuron-killing tangles.
New drugs, Leqembi and Kisunla, can modestly slow worsening symptoms by removing gunky amyloid from the brain. But they only work in the earliest stages of Alzheimer’s and proving patients qualify in time can be difficult. Measuring amyloid in spinal fluid is invasive. A special PET scan to spot plaques is costly and getting an appointment can take months.
Even specialists can struggle to tell if Alzheimer’s or something else is to blame for a patient’s symptoms.
“I have patients not infrequently who I am convinced have Alzheimer’s disease and I do testing and it’s negative,” Schindler said.
New study suggests blood tests for Alzheimer’s can be simpler and faster
Blood tests so far have been used mostly in carefully controlled research settings. But a new study of about 1,200 patients in Sweden shows they also can work in the real-world bustle of doctors’ offices — especially primary care doctors who see far more people with memory problems than specialists but have fewer tools to evaluate them.
In the study, patients who visited either a primary care doctor or a specialist for memory complaints got an initial diagnosis using traditional exams, gave blood for testing and were sent for a confirmatory spinal tap or brain scan.
Blood testing was far more accurate, Lund University researchers reported Sunday at the Alzheimer’s Association International Conference in Philadelphia. The primary care doctors’ initial diagnosis was 61% accurate and the specialists’ 73% — but the blood test was 91% accurate, according to the findings, which also were published in the Journal of the American Medical Association.
Which blood tests for Alzheimer’s work best?
There’s almost “a wild West” in the variety being offered, said Dr. John Hsiao of the National Institute on Aging. They measure different biomarkers, in different ways.
Doctors and researchers should only use blood tests proven to have a greater than 90% accuracy rate, said Alzheimer’s Association chief science officer Maria Carrillo.
Today’s tests most likely to meet that benchmark measure what’s called p-tau217, Carrillo and Hsiao agreed. Schindler helped lead an unusual direct comparison of several kinds of blood tests, funded by the Foundation for the National Institutes of Health, that came to the same conclusion.
That type of test measures a form of tau that correlates with how much plaque buildup someone has, Schindler explained. A high level signals a strong likelihood the person has Alzheimer’s while a low level indicates that’s probably not the cause of memory loss.
Several companies are developing p-tau217 tests including ALZpath Inc., Roche, Eli Lilly and C2N Diagnostics, which supplied the version used in the Swedish study.
Who should use blood tests for Alzheimer’s?
Only doctors can order them from labs. The Alzheimer’s Association is working on guidelines and several companies plan to seek FDA approval, which would clarify proper use.
For now, Carrillo said doctors should use blood testing only in people with memory problems, after checking the accuracy of the type they order.
Especially for primary care physicians, “it really has great potential to help them in sorting out who to give a reassuring message and who to send on to memory specialists,” said Dr. Sebastian Palmqvist of Lund University, who led the Swedish study with Lund’s Dr. Oskar Hansson.
The tests aren’t yet for people who don’t have symptoms but worry about Alzheimer’s in the family — unless it’s part of enrollment in research studies, Schindler stressed.
That’s partly because amyloid buildup can begin two decades before the first sign of memory problems, and so far there are no preventive steps other than basic advice to eat healthy, exercise and get enough sleep. But there are studies underway testing possible therapies for people at high risk of Alzheimer’s, and some include blood testing.
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Compounds found in cannabis could provide a new roadmap for treating the world’s most common chronic liver disorder, according to a study released by the Hebrew University of Jerusalem.
The research, published in the British Journal of Pharmacology, found that cannabidiol (CBD) and cannabigerol (CBG) significantly reduced liver fat and improved metabolic health in experimental models.
CBD is the more widely studied non-intoxicating cannabinoid, while CBG is a less common “precursor” cannabinoid from which CBD is formed.
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Unlike THC, the primary psychoactive component in cannabis, these compounds do not produce a “high,” making them viable candidates for long-term medical treatment, the study suggests.
Metabolic dysfunction-associated steatotic liver disease (MASLD) currently affects approximately one-third of the global adult population, according to health data.
Metabolic dysfunction-associated steatotic liver disease (MASLD) currently affects approximately one-third of the global adult population. (iStock)
The condition, which is closely linked to obesity and insulin resistance, has few approved pharmaceutical treatments, the researchers said, leaving patients to rely largely on lifestyle changes that can be difficult to maintain.
“Our findings identify a new mechanism by which CBD and CBG enhance hepatic energy and lysosomal function,” said lead study author Joseph Tam, director of the Multidisciplinary Center for Cannabinoid Research at Hebrew University, in a press release.
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The study highlights a process called “metabolic remodeling,” in which the cannabis compounds created a “backup battery” for the liver by increasing levels of phosphocreatine, a high-energy molecule stored in muscle cells.
This energy reserve helps the organ function under the stress of a high-fat diet, which was an unexpected discovery, the team noted.
Researchers focused on CBD and CBG, two non-psychoactive compounds that offer therapeutic benefits without the “high” associated with THC. (iStock)
The researchers also found that CBD and CBG restored the activity of “cellular cleaning crews” known as cathepsins, enzymes that work within the cell’s recycling centers to break down harmful fats and waste.
With this process, the liver was better able to clear out dangerous lipids, including triglycerides and ceramides, which are known to trigger inflammation, the study showed.
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While both compounds were effective, CBG showed more robust results in certain areas, such as reducing total body fat mass, lowering “bad” LDL cholesterol and improving insulin sensitivity.
Researchers say this study opens a new path for using plant-based compounds to treat metabolic diseases by focusing on how cells manage energy and waste.
The discovery of a phosphocreatine “backup battery” in the liver marks a significant shift in how scientists understand the organ’s ability to survive high-fat diets. (iStock)
Limitations and caveats
Despite the promising results, the research team cautioned that the study was conducted in a controlled experimental environment. Further clinical trials are necessary to determine the proper application for human patients.
Other recent studies have pointed to potential issues with using cannabis as a medical tool.
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A major analysis published in JAMA examined more than 2,500 scientific papers from the last 15 years, including other reviews, clinical trials and guidelines focused on medical marijuana.
The 2025 review highlighted significant gaps between public perception and scientific evidence regarding cannabis’ effectiveness for most medical conditions.
Other recent studies have pointed to issues with the efficacy of cannabis as a medical tool. (iStock)
The researchers concluded that there are very few conditions for which cannabinoid therapies have clear, well-established benefits backed by high-quality clinical data.
“Whenever a substance is widely used, there is likely to be a very wide set of outcomes,” Alex Dimitriu, MD, who is double board-certified in psychiatry and sleep medicine and founder of Menlo Park Psychiatry & Sleep Medicine, previously told Fox News Digital. “This study points to the reality that this widely used substance is not a panacea.”
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The strongest evidence supports FDA-approved cannabinoid medications for treating specific conditions, including HIV/AIDS-related appetite loss, chemotherapy-induced nausea and vomiting, and certain severe pediatric seizure disorders, according to the review.
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Anyone interested in using marijuana for medical purposes should speak to a healthcare provider to discuss potential risks and benefits.
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While cannabis has recently come under fire for potential negative health risks, a recent study suggests that its use could increase brain volume and cognitive fitness.
Researchers at the University of Colorado Anschutz Medical Campus analyzed cannabis usage, brain scans and cognitive test results for more than 26,000 adults between the ages of 40 and 77, using data from the UK biobank.
The study found that cannabis users — particularly those who reported moderate lifetime usage — showed larger volumes in several brain regions.
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“Compared to individuals with no history of cannabis use, those who reported using cannabis showed larger volumes in several brain regions characterized by a high density of cannabinoid (CB1) receptors — regions involved in processes such as memory, information processing and emotion regulation,” lead study author Anika Guha, Ph.D., a researcher at the University of Colorado Anschutz Medical Campus, told Fox News Digital.
A recent study suggests that cannabis use could increase brain volume and cognitive fitness. (iStock)
The cannabis users also scored better on cognitive tests that measured learning, processing speed and executive function.
This outcome differs from many previous studies, which have focused on short-term cognitive impairment during or shortly after cannabis use, the researcher pointed out.
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“These findings suggest that the relationship between cannabis and the brain may differ across the lifespan, and that moderate use in mid-to-later adulthood may be associated with positive brain health outcomes,” Guha said.
Not all areas of the brain showed positive effects among cannabis users. The posterior cingulate, which is involved in self-reflection and memory, had lower volume with higher marijuana use.
“The takeaway is not that people should start using more cannabis based on these findings alone.”
As cannabis has been rising in popularity among all ages, this type of study is important for understanding its long-term effects and the pros and cons of use, according to Matt Glowiak, Ph.D., chief addiction specialist with Recovered, an organization that provides information and resources for mental health and addiction treatment.
The drug’s effects likely depend on factors such as age, dose, frequency, product composition and individual vulnerability. (AP Photo/Martin Meissner, File)
“Given the connection between cannabis use and larger brain volume, it is believed that it may help [older] individuals retain cognitive function that might otherwise naturally decline,” Chicago-based Glowiak, who was not involved in the study, told Fox News Digital.
“This is a huge benefit, but one we need to explore a bit further, ahead of encouraging those who would otherwise not consider integrating cannabis into their healthcare regimen.”
Limitations and caveats
As the study was observational in nature, it could not prove that cannabis use improves brain health — instead, it only showed an association, according to Dr. Marc Siegel, Fox News senior medical analyst, who was not involved in the study.
“The preponderance of previous evidence does not line up with improved cognitive function from chronic cannabis use,” Siegel told Fox News Digital. “This study is an outlier, and though it cannot be ignored, it is not justification for use.”
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The study also relied on the UK Biobank, which offers a “large and rich dataset,” Guha said — but it is limited to the questions that were originally posed to the participants.
“In particular, we have only a broad measure of how many times someone has used cannabis over their lifetime,” she said. “We do not have access to details about how they used cannabis, such as whether they smoked or used edibles, the type or potency of cannabis, or when in their life they used most heavily.”
Cannabis users scored better in learning, processing speed and executive function. (iStock)
“Those details likely matter a great deal for understanding how cannabis affects the aging brain.”
Given these limitations, Guha suggests that the findings should be seen as an early indicator that cannabis use may be related to brain aging, “and as a starting point for more targeted research that can tease apart these relationships.”
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“The takeaway is not that people should start using more cannabis based on these findings alone,” she emphasized. “While cannabis may have potential benefits in some contexts, a substantial body of research also documents important risks, underscoring that cannabis is neither completely beneficial nor completely harmful.”
The drug’s effects likely depend on factors such as age, dose, frequency, product composition and individual vulnerability, according to Guha.
“Given the widespread use and legalization of cannabis, it would be great to know that it is net-positive for brain health — however, this feels too good to be true, and too early to claim,” one expert said. (AP)
“As with any substance, individuals should consult with a healthcare provider before initiating use, particularly if they have a history of mental health concerns, as THC (the primary psychoactive component of cannabis) can exacerbate symptoms such as psychosis in vulnerable individuals,” she added.
Dr. Alex Dimitriu, who is double board-certified in psychiatry and sleep medicine and the founder of Menlo Park Psychiatry & Sleep Medicine, reiterated that this study is an “outlier,” as most previous research has shown “detrimental effects” from cannabis use.
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“Given the widespread use and legalization of cannabis, it would be great to know that it is net-positive for brain health — however, this feels too good to be true, and too early to claim,” he said. “I would advise proceeding with caution and moderation.”
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Dimitriu agreed that more large-scale studies and review papers are needed to get a “clearer picture.”
“What this cannabis study shows is that there may be conflicting information, which warrants more investigation.”
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Parents are being warned of a new trend among kids, involving alcohol and an open flame.
The “fire-breathing” challenge has led to reports of severe burns, according to local news outlets.
Kids and teens are reportedly holding alcohol in their mouths and blowing it onto a match or another open flame to mimic “breathing fire.”
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According to Philadelphia’s 6ABC News (WPVI), a teen in Pitcairn, Pennsylvania, was intubated and treated for burns to the face, neck and chest after attempting the trend.
A “fire-breathing” challenge is leaving kids with severe burns, according to local reports. (iStock)
“Luckily, in this particular case, it did not burn the building down,” Al Hussey, Wilmerding Borough fire marshal, told WPVI.
“But somebody really got hurt, and, you know, is going to have life-altering injuries.”
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Pitcairn Fire Chief Tommy Dick told CBS News Pittsburgh (KDKA) the 14-year-old girl was playing with isopropyl alcohol at an apartment complex.
“It’s not a very smart thing for anybody to do, let alone children,” Dick said. “It’s supposed to be for cleaning off wounds and cuts and stuff, not ingesting and trying to blow fire.
A local fire chief told CBS News Pittsburgh that the incident could have been fatal for the teen. (iStock)
“This could have easily gone inside their digestive tract, and she could have died.”
Anyone who has ingested isopropyl alcohol requires immediate medical attention, according to Healthline, because it can cause stomach pain, dizziness, confusion and slowed breathing. In severe cases, it can lead to a coma.
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Fire experts are urging parents to closely monitor which household products are within their children’s reach.
Ingesting isopropyl alcohol requires immediate medical attention, according to experts. (iStock)
“If they’re doing their hair with chemicals, if they’re taking isopropyl alcohol in the room or any type of fingernail polish remover,” Hussey said. “Obviously, monitor your lighters and your matches and educate your children.”
Multiple cases of children’s injuries have occurred in recent weeks after being allegedly “inspired” by online stunts, WPVI reported. One trend involved microwaving a toy that burst and left severe burns on a 9-year-old’s face.
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