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Liver disease: how new intelligent testing could save thousands of lives

LFTs are commonly abnormal due to a variety of reasons, such as drinking too much, fatty liver caused by obesity, infections, rare liver diseases and some cancers – but they can be a sign of curable potentially fatal liver disease. But it is complex to sort out what to do about them – many people with abnormal LFTs are not investigated because of the complex pattern of investigation. In those who are, current care is geared to find an explanation via a lengthy process of investigation and ruling things out, with costs to patients and the NHS in terms of money and time – many people drop out along the way.

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  Liver blood tests (formerly known as liver function tests – LFTs)

Until recently, liver blood tests were referred to as liver function tests, or LFTs. However, as most patients with abnormal liver blood tests actually have normal function of the liver, this term was felt to be unhelpful and often led to unnecessary concern. Therefore the term liver function tests, or LFTs, has been replaced by liver blood tests. This is a very important change, and the medical profession is working hard to ensure the new term is widely accepted and used. Calling these tests liver blood tests is a more accurate way of describing what the test actually does and uses less frightening language.

  Liver Function Tests Decoded

What all is involved in the Liver “Function” Tests? If the chief complaint of your patient is abdominal pain, altered mental status, overdose, generalized weakness chances are you at least considered ordering a hepatic panel. In fact, studies show that the hepatic panel is the third most common laboratory test ordered in the emergency department only behind the CBC and renal panel. If emergency medicine physicians are so quick to order this test, it is important to also know how to interpret all the little red arrows that often accompany your results. For this we will review each component and even (wait for it) … a little biochemistry!

 What is the Real Function of the Liver ‘Function’ Tests?

Liver Function Tests (LFTs) are one of the most commonly-requested screening blood tests. Whether for the investigation of suspected liver disease, monitoring of disease activity, or simply as ‘routine’ blood analysis, these tests can provide a host of information on a range of disease processes. The title ‘liver function tests’ is, however, somewhat of a misnomer; only the bilirubin and albumin given in this panel offer information regarding the functional capacity of the liver.

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Liver Function Tests

Overall analysis of Liver Function Tests (LFT)

A Mini Guide to the Liver Function Tests to Help You for Sure

LFTs are performed to assess how your liver is functioning and help to diagnose liver disease such as hepatitis or conditions like cirrhosis. Sometimes, they can also help monitor side effects of certain drugs. When an LFT detects enzyme or protein levels above or below the normal range, it can indicate a liver problem.

Beyond the Liver Function Tests: A Radiologist's Guide to the Liver Blood Tests

Liver blood tests (often also known as liver chemistries, liver tests, or the common misnomer liver function tests) are routinely used in diagnosis and management of hepatobiliary disease. Abnormal liver blood test results are often the first indicator of hepatobiliary disease and a common indication for abdominal imaging with US, CT, or MRI. Most of the disease entities can be categorized into hepatocellular or cholestatic patterns, with characteristic traits on liver blood tests. Each pattern has a specific differential, which can help narrow the differential diagnosis when combined with the clinical history and imaging findings.

Guidelines on the management of abnormal liver blood tests

These updated guidelines on the management of abnormal liver blood tests have been commissioned by the Clinical Services and Standards Committee (CSSC) of the British Society of Gastroenterology (BSG) under the auspices of the liver section of the BSG. The original guidelines, which this document supersedes, were written in 2000 and have undergone extensive revision by members of the Guidelines Development Group (GDG).

LFT: All You Need to Know About Liver Function Test

LFT helps in measuring how well the liver is performing its normal functions of producing protein and clearing bilirubin (blood waste product), measuring enzymes that liver cells release in response to damage or disease. What is important to note is that all abnormal liver function test results don’t always indicate a liver disease.

Special Considerations in Interpreting Liver Function Tests

A number of pitfalls can be encountered in the interpretation of common blood liver function tests. These tests can be normal in patients with chronic hepatitis or cirrhosis. The normal range for aminotransferase levels is slightly higher in males, nonwhites and obese persons. Severe alcoholic hepatitis is sometimes confused with cholecystitis or cholangitis. Conversely, patients who present soon after passing common bile duct stones can be misdiagnosed with acute hepatitis because aminotransferase levels often rise immediately, but alkaline phosphatase and γ-glutamyltransferase levels do not become elevated for several days.

What are some of the most common liver function tests?

A series of special blood tests can often determine whether or not the liver is functioning properly. These tests can also distinguish between acute and chronic liver disorders and between hepatitis and cholestasis.

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StatPearls

These tests can help determine an area of the liver where damage may be taking place and, depending on the pattern of elevation, can help organize a differential diagnosis. Elevations in ALT and AST disproportion to elevations in alkaline phosphatase and bilirubin denote hepatocellular disease. An elevation in alkaline phosphatase and bilirubin in disproportion to ALT and AST would characterize a cholestatic pattern.