Alanine Aminotransferase (ALT)
Private ALT testing in London for £30, measuring one liver enzyme marker with laboratory results expected in around 1–2 days.
Turnaround time
1-2 business days
Biomarkers count
1
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Overview of the Alanine Aminotransferase (ALT) Test
The Alanine Aminotransferase blood test measures ALT, an enzyme found predominantly within liver cells.
The test assesses 1 liver enzyme marker: Alanine Aminotransferase.
ALT is involved in amino-acid metabolism.
Under normal circumstances, relatively small amounts circulate in the bloodstream.
When liver cells become inflamed or damaged, ALT can leak from the cells into the blood and the measured concentration can rise.
For this reason, ALT is one of the most widely used markers of hepatocellular injury.
Raised ALT can occur with several liver conditions.
These include metabolic dysfunction-associated steatotic liver disease, viral hepatitis, alcohol-related liver injury, medication effects and other forms of hepatic inflammation.
However, ALT is not completely specific to one diagnosis.
The degree of elevation does not always directly reflect the severity of liver disease.
A person can also have significant chronic liver disease with an ALT result that is normal or only mildly raised.
ALT should therefore usually be interpreted alongside other liver markers.
These can include Aspartate Transaminase, Gamma-Glutamyltransferase, Alkaline Phosphatase, Bilirubin and Albumin.
The pattern across several markers can provide more useful information than ALT alone.
Medication, supplements, alcohol intake, recent illness and strenuous exercise can also influence liver enzymes and should be considered during interpretation.
What Does the Alanine Aminotransferase (ALT) Test Check?
The test measures Alanine Aminotransferase, a liver-associated enzyme that can increase when liver cells are inflamed or injured. This test measures 1 biomarker.
Alanine Aminotransferase
Measures ALT, an enzyme found predominantly in liver cells that can rise in the blood when hepatocytes are inflamed or damaged.
Who May Benefit From the Alanine Aminotransferase (ALT) Test?
ALT testing can be useful during routine liver assessment, medication monitoring or investigation of a previously abnormal liver result.
People with previously abnormal liver function tests - Repeat ALT can help establish whether an elevation persists.
People with fatty liver risk factors - Obesity, insulin resistance and metabolic syndrome can be associated with liver fat accumulation and raised ALT.
People taking medicines that can affect the liver - Selected medications require liver-enzyme monitoring.
People with significant alcohol intake - ALT can contribute to a broader liver assessment, although GGT and AST may also provide important information.
People undergoing viral hepatitis investigation - ALT can rise when viral infection causes liver inflammation.
People with metabolic syndrome or diabetes - Metabolic liver disease is common in these groups.
People monitoring a known liver condition - Serial ALT measurements can contribute to clinical follow-up.
People seeking a focused liver enzyme check - ALT can be measured individually or within a broader Liver Function profile.
How to Prepare
Do not stop prescribed medication solely to change ALT unless this has been specifically advised by the clinician managing treatment.
Persistent or significant ALT elevation may require a broader liver assessment.
Symptoms and Reasons to Consider the Alanine Aminotransferase (ALT) Test
Mild liver enzyme abnormalities frequently cause no symptoms and are discovered during routine blood testing.
A previous raised ALT result - Repeat testing can help determine whether the abnormality persists.
Persistent unexplained fatigue - Liver disease can contribute to fatigue, although this symptom is highly non-specific.
Right upper abdominal discomfort - Liver or gallbladder conditions can cause discomfort, but many other causes are possible.
Jaundice or yellowing of the eyes - This requires broader liver assessment and should not be investigated with ALT alone.
Dark urine or pale stools - These symptoms can occur with biliary or liver disease and warrant clinical evaluation.
Metabolic risk factors - Obesity, insulin resistance and diabetes can increase the likelihood of fatty liver disease.
Recent medication changes - Some medicines and supplements can affect liver enzymes.
Known hepatitis or liver disease - ALT can contribute to ongoing monitoring.
ALT does not diagnose a specific liver condition on its own.
Significant jaundice, severe abdominal pain, confusion, vomiting blood or rapidly worsening illness requires prompt medical assessment.
A normal ALT does not completely exclude chronic liver disease.
How to Book Your Alanine Aminotransferase (ALT) Test
The Alanine Aminotransferase test can be booked privately for focused assessment of this important liver enzyme.
Choose the Alanine Aminotransferase (ALT)
Select the individual ALT blood test online.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy where suitable.
Attend your appointment
A trained healthcare professional collects the required venous blood sample.
Laboratory analysis
Your serum undergoes laboratory measurement of Alanine Aminotransferase.
Receive your results securely
Your authorised result is delivered securely and can be interpreted alongside wider liver-function markers where appropriate.
When Will I Receive My Results?
The current London Blood Tests turnaround for Alanine Aminotransferase is approximately 1–2 days after laboratory receipt.
ALT is a routine biochemistry measurement and is generally processed quickly.
The sample still undergoes laboratory analysis, quality-control procedures and result authorisation.
Turnaround begins when the specimen reaches the laboratory rather than necessarily from the exact time of collection.
Understanding Your Results
The result shows the concentration of Alanine Aminotransferase in the blood.
A raised ALT result can indicate liver-cell injury or inflammation.
Common possible explanations include fatty liver disease, viral hepatitis, alcohol-related liver injury, medication effects and other liver conditions.
The pattern matters.
ALT interpreted with AST, GGT, ALP and Bilirubin can help distinguish different types of liver-test abnormality.
A mildly raised ALT does not automatically indicate serious liver disease.
Equally, the degree of elevation does not always correspond directly to the amount of long-term liver damage.
A normal ALT result is reassuring with regard to active hepatocellular enzyme release but does not exclude every form of chronic liver disease.
The result should therefore be interpreted alongside medical history, alcohol intake, medicines, metabolic risk factors and other laboratory findings.
Why Book With London Blood Tests?
London Blood Tests provides private ALT testing for focused assessment of liver-cell enzyme activity.
Measures a key liver enzyme - ALT is one of the principal laboratory markers used to assess hepatocellular injury.
Useful for monitoring previous abnormalities - Repeat testing can help determine whether an elevated ALT persists or resolves.
Relevant to metabolic liver health - Fatty liver disease can be associated with abnormal ALT.
Can support medication monitoring - Selected medicines require liver-enzyme assessment.
Can complement broader liver testing - AST, GGT, ALP, Bilirubin and Albumin can provide additional information.
Rapid laboratory turnaround - Results are currently expected approximately 1–2 days after laboratory receipt.
Professional blood collection - Clinic and suitable home or hotel phlebotomy appointments are available.
Clear pricing - The Alanine Aminotransferase test costs £30.
Private Alanine Aminotransferase (ALT) Blood Test in London
London Blood Tests provides private Alanine Aminotransferase testing for people who require a focused assessment of this liver enzyme.
The test costs £30 and measures 1 biomarker.
Results are expected approximately 1–2 days after laboratory receipt.
ALT is most useful when interpreted alongside other liver-function markers and the wider clinical context.