Alanine Aminotransferase (ALT)

ALT is a liver enzyme that helps check how healthy your liver cells are.

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Test Summary

Sample Type 
Blood
Required Blood
1 mL
Analysis Type
Serum
Collection method
In person at the lab; at-home where available

Why test

Alanine Aminotransferase (ALT)

?

Clinicians order ALT to check liver health, often as part of a liver panel. It helps evaluate symptoms like fatigue, dark urine, or jaundice, and to monitor medicines that can affect the liver. Results can guide next steps such as repeating the test, reviewing medications, or adding other liver tests. You can test this marker with Aniva across Germany and Finland.

What is

Alanine Aminotransferase (ALT)

?

Clinicians order ALT to check liver health, often as part of a liver panel. It helps evaluate symptoms like fatigue, dark urine, or jaundice, and to monitor medicines that can affect the liver. Results can guide next steps such as repeating the test, reviewing medications, or adding other liver tests. You can test this marker with Aniva across Germany and Finland.

What insights will i get from

Alanine Aminotransferase (ALT)

?

High: May point to recent liver irritation or injury from fatty liver, alcohol, medicines, infections, or bile flow problems. Hard workouts and muscle injury can also nudge ALT up. A helpful step is to avoid alcohol and strenuous exercise, review medicines, and consider a repeat test.
Low: Usually not concerning and often normal. Rarely, it may relate to low vitamin B6 or low muscle mass. Discuss with your clinician if you have symptoms.

Sample type & collection

  • Sample: Blood
  • Fasting: No
  • Best timing: Any time of day
  • Collection: In person at the lab; at-home where available
  • Typical volume: 1 mL
  • Analysis: Serum
  • Prep tips: Avoid alcohol and strenuous exercise 24 hours before; list medicines and supplements
  • Turnaround: 1–2 business days

Alanine Aminotransferase (ALT)

is best interpreted with:

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Alanine Aminotransferase (ALT)

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Alanine Aminotransferase (ALT)
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Limits & interferences with

Alanine Aminotransferase (ALT)

:

Common factors that can skew results include recent alcohol use, strenuous exercise, or muscle injury. Some medicines (acetaminophen, statins, antibiotics, anti‑seizure drugs) and herbal products like kava or green tea extract may raise ALT. Acute illness, pregnancy changes, dehydration, and sample issues (hemolysis or delayed processing) can also affect values.

Special situations (when to confirm or adjust): testing soon after starting a new medicine, after hard workouts, during pregnancy, or after an illness—consider retesting once recovered.

Questions about

Alanine Aminotransferase (ALT)

:

What does a high ALT mean? It suggests your liver cells are irritated or stressed. Causes include medicines, alcohol, infections, or fatty liver.

Do I need to fast for an ALT test? No. Fasting is not required for ALT.

What can affect my ALT result? Recent alcohol, hard workouts, muscle injury, illness, or certain medicines and herbal supplements can change values.

How often should I check ALT? It depends on your situation. Many people recheck within weeks to months after changes or if elevated.

How long do results take? Most labs report ALT within 1–2 business days.

What should I discuss with my clinician? Share all medicines and supplements, alcohol use, and recent exercise or illness to guide next steps.

Sources:

  • MedlinePlus — Alanine Aminotransferase (ALT) Test. (2024). https://medlineplus.gov/lab-tests/alanine-aminotransferase-alt-test/
  • American College of Gastroenterology — Evaluation of Abnormal Liver Chemistries. (2017). https://gi.org/guideline/evaluation-of-abnormal-liver-chemistries/
  • AASLD — How to approach elevated liver enzymes. (2023). https://www.aasld.org/liver-fellow-network/core-series/back-basics/how-approach-elevated-liver-enzymes
  • ARUP Consult — Evaluation of Liver Injury. (2024). https://arupconsult.com/content/evaluation-liver-injury
  • NIDDK — Tests to Diagnose and Monitor Liver Disease. (2023). https://www.niddk.nih.gov/health-information/liver-disease/diagnosis
Medical disclaimer: This content is for informational purposes only and is not medical advice. Always discuss results with a qualified healthcare professional.

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