Liver disease often progresses silently until it has become a serious condition. Researchers at The University of Toledo may have found a way to identify one of its earliest warning signs before symptoms appear.
By the time symptoms such as fatigue, jaundice and abdominal discomfort develop, liver disease has often progressed beyond its earliest and most treatable stages. New research from UToledo could help change that.
According to University of Toledo researcher Dr. Matam Vijay-Kumar, a standard blood panel will check your cholesterol, your blood glucose, your triglycerides. It will not measure your bile acids. But he said that omission may be costing patients the window of time when intervention matters most.
"Bile acids are a very neglected analyte in the clinics," said Vijay-Kumar, a professor of physiology and pharmacology at UToledo's College of Medicine and Life Sciences. "What we are proposing is that bile acids should be measured in clinics."
Bile acids are compounds produced by the liver that aid in digesting fats. Under normal conditions, they circulate between the liver and intestine while remaining largely out of the bloodstream. When liver function is impaired or bile flow becomes blocked, they accumulate in the blood in a condition known as cholemia. The challenge is that elevated bile acids in the early stages of liver dysfunction are asymptomatic and silent, leaving liver conditions to progress without announcement until conventional markers finally catch up.
Because routine care doesn't test for bile acids, early cholemia goes undetected. By the time liver disease announces itself through standard bloodwork, the underlying problem has often been quietly progressing for a while.
Vijay-Kumar's research, recently published in the American Journal of Physiology — Gastrointestinal and Liver Physiology , proposes a way to close that gap after surprising test results.
Because bile acids interact with cell membranes, researchers expected red blood cells to become more fragile. Instead, they found the opposite.
Red blood cells from mice with elevated bile acids were significantly more resistant to rupturing than normal cells, not weaker. The finding held across multiple genetic mouse models and, importantly, in human patients as well. Blood samples from 23 cholestatic liver disease patients at the University of Toledo Medical Center showed the same pattern when compared to 23 healthy controls: the disease patients' red blood cells were measurably tougher.
Researchers found that elevated bile acid exposure causes the membrane to accumulate more cholesterol while losing phospholipids, altering the ratio between the two in a way that makes the membrane more rigid. That rigidity makes the cells resistant to osmotic stress in ways that can be detected with a simple test.
"It is a very striking result," Vijay-Kumar said. "We can identify people with high bile acids with 100 percent accuracy. When they do blood glucose, they can take another four microliters, put it into solution, wait ten or twenty minutes, and they will get the answer."
The screening method correctly distinguished patients with elevated bile acids from healthy controls. The implications extend well beyond general liver screening. Vijay-Kumar points to pregnant women as a population with particularly urgent need for this kind of early detection.
"Pregnant women should be monitored carefully," he said. "Once it crosses 40 micromolar, the bile acids can cause severe damage to the fetus — they may have to induce premature birth, or even risk stillbirth. This assay would be very important in the clinics."
The UToledo research team has filed a patent application: "Rapid Screening for Elevated Bile Acids Using Whole Blood," application number 18844313, for the diagnostic concept underlying the test.
Vijay-Kumar frames the broader clinical significance in direct terms. He says elevated bile acids are typically the first indicator to rise when the liver is under stress, arriving before the more obvious markers physicians currently rely on.
"The majority of liver diseases are associated with elevated bile acids," he said. "This first-line screening is very critical."
A positive result would not diagnose liver disease. Instead, it would signal that additional evaluation is needed while treatment options may still be most effective. At minimum, early detection could prompt dietary changes or closer monitoring. At best, it could catch cholestatic liver disease, hepatobiliary dysfunction, or early-stage hepatic injury while there is still meaningful time to act.
Experimental study
Animals
Elevated circulating bile acids driven erythrocyte osmotic resistance marks hepatobiliary disease
3-Aug-2026