AI Summary Neurocognitive testing uses paper, computer, or brain-wave tests to find covert hepatic encephalopathy (HE), a brain complication of liver disease that a routine exam can miss. It is noninvasive and can be repeated. Doctors often combine tests such as PHES, EncephalApp Stroop, and EEG, then read results alongside symptoms, ammonia levels, and the West Haven Criteria. Abnormal results may lead to treatment and closer monitoring.
Source: www.liverdirectory.com
Medically Reviewed.
Neurocognitive testing is a set of paper-and-pencil, computer-based, or brain-wave tests doctors use to detect subtle changes in attention, reaction time, and thinking caused by hepatic encephalopathy (HE) — a complication of liver disease that affects the brain.
These tests matter most for covert HE, a stage where cognitive deficits show up on testing before they're obvious in conversation or a physical exam. A standard exam alone cannot catch it.
This page explains why your doctor might order neurocognitive testing, the main tests used, how results are interpreted, and how testing fits alongside ammonia levels, the West Haven Criteria, and other parts of an HE workup.
Liver Health AI Assistant
Ask Aimy
Aimy answers from LiverDirectory’s reviewed health information — helping patients make sense of liver-health terms, prepare for specialist visits, and explore what to look up next.
Covert HE Detection Basics
Hepatic encephalopathy (HE) is a decline in brain function that happens when a damaged liver can no longer clear certain toxins from the blood. Neurocognitive testing is how doctors measure that decline directly, using tasks that check attention, psychomotor speed, and executive function rather than relying on a conversation alone.
These tests matter most for covert hepatic encephalopathy (CHE) — a combination of minimal HE (MHE) and the mildest clinical grade — because CHE involves subtle deficits that don't show up on a standard physical exam. Psychometric tools such as the Psychometric Hepatic Encephalopathy Score (PHES) and neurophysiological methods such as EEG are the tools used to find it.
Catching covert HE early matters: it predicts the later development of overt HE, more hospitalizations, and reduced survival, which is why testing — not just watching for obvious confusion — is part of the evaluation for people with cirrhosis.
Reasons for HE Testing
Your doctor may order neurocognitive testing in several situations.
You have cirrhosis or another advanced liver disease, and your care team wants to check for covert HE before it becomes obvious — since roughly 10% to 14% of people already have overt HE at the time cirrhosis is diagnosed.
A family member mentions you seem "foggy," forgetful, or slower to respond, but you don't feel obviously confused. These are the kinds of changes covert HE testing is designed to catch.
Your doctor wants a baseline read on your cognitive function, for example before a transjugular intrahepatic portosystemic shunt (TIPS) procedure, which can raise HE risk.
You've been diagnosed with HE and started treatment such as lactulose or rifaximin, and your doctor wants to track whether your cognitive function is improving over time.
Psychometric and EEG Tests
Doctors combine psychometric and neurophysiological tests because no single tool captures every kind of cognitive change from hepatic encephalopathy.
For research and multicenter studies, using at least two validated methods together is recommended — for example, PHES plus a computerized test (like EncephalApp Stroop) or a neurophysiological test (like CFF or EEG) — rather than relying on any single tool.
Interpreting HE Test Scores
HE exists on a continuum. Minimal HE (MHE) means testing detects brain dysfunction with no clinical signs at all. Covert HE (CHE) is the combined term for MHE plus West Haven Grade I — subtle changes a family member might notice but that don't include disorientation or asterixis (a flapping hand tremor). Overt HE (OHE) begins once disorientation or asterixis appears.
There isn't one universal cutoff for every test. Instead, results are typically compared to scores expected for your age and education level, since normal psychomotor speed varies between people. Your care team interprets your test results together with your symptoms, exam findings, and other labs.
An abnormal neurocognitive test in someone with known liver disease supports a diagnosis of covert HE and often prompts treatment, closer monitoring, or a conversation about safety issues like driving. A normal result is reassuring but doesn't rule out HE if your symptoms or exam suggest otherwise — testing is one part of the picture, not the whole picture.
HE Testing in Context
Neurocognitive testing and ammonia testing measure different things and work best together. A blood ammonia level reflects toxin buildup, but on its own it does not confirm or grade HE — some people with clearly overt HE have normal ammonia, and some people with high ammonia have no cognitive symptoms. Neurocognitive testing measures the functional effect on the brain directly.
Clinicians use the West Haven Criteria to grade overt HE from Grade I (mild confusion, altered sleep) through Grade IV (coma) once someone is clearly symptomatic. Neurocognitive testing fills the gap before West Haven grading applies — it's how covert HE is found in the first place.
Because HE symptoms often have a trigger, your care team will also look for and treat precipitating factors — such as infection, dehydration, constipation, GI bleeding, or a new sedative medication — alongside any cognitive testing.
A balanced, liver-friendly diet supports your liver, helps manage weight and blood sugar, and lowers the risk of other health problems during long-term follow-up.
Explore Liver DietThe Amsety Bar is a liver-friendly snack or meal replacement that can make it easier to eat well on busy days.
Shop Amsety Bars
Common Questions
It's a set of tests that measure attention, reaction time, and other thinking skills to detect hepatic encephalopathy (HE). The tests can be paper-and-pencil tasks, computer or smartphone tasks, or brain-wave recordings such as EEG. They matter most for covert HE, the form that doesn't show up on a routine exam or in conversation. These tests are necessary because covert HE involves subtle changes in attention, psychomotor speed, and executive function. Your care team reads the results together with your symptoms, exam, and other labs.
No. Ammonia is a blood test that reflects toxin buildup, while neurocognitive testing measures how your brain is actually working. A single ammonia level does not confirm or grade HE: some people with clearly overt HE have normal ammonia, and some people with high ammonia have no cognitive symptoms. Because the two tests answer different questions, they are typically used together as part of a broader HE workup.
No, the tests carry little risk. They are noninvasive: timed paper tasks, computer tasks, or a painless EEG recording that reads the brain's electrical activity. There's no needle or procedure involved. Because of that, your care team can repeat them over time to see whether your thinking is stable, improving after treatment, or changing.
Covert HE means testing finds cognitive changes that a normal conversation or exam would miss. It includes minimal HE, which has no clinical signs at all, and West Haven Grade I, which causes subtle changes. Overt HE begins once disorientation or asterixis (a flapping hand tremor) appears. At that point, doctors usually diagnose it from your mental status and movement on exam, rather than from testing alone. Other signs of overt HE can include confusion, slurred speech, and lethargy.
Yes, it can still matter. Covert HE often causes no symptoms you or others would notice, but it predicts a higher risk of developing overt HE, more hospitalizations, and reduced survival. That is why finding it early is a goal of care for people with cirrhosis. HE is also treatable and often reversible, especially when it is recognized early. If your test is abnormal, your care team may suggest treatment, closer monitoring, and a conversation about safety issues like driving.
Medical disclaimer: LiverDirectory provides educational information and a directory of providers. It does not provide medical advice, diagnosis, or treatment. Always consult a licensed physician regarding any medical condition.
