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Autoimmune

Smooth Muscle Antibodies (SMA): what a positive SMA screen means

Smooth Muscle Antibodies (SMA) are autoantibodies commonly associated with autoimmune hepatitis. Testing SMA provides comprehensive insight into liver-related immune activity and can support early detection of autoimmune liver conditions.

Doctor's Assessment Included

SMA are antibodies that the body's own immune system makes against smooth muscle, the muscle tissue in the gut and other organs. Normally the result is negative; Diagnostiek voor U counts a titre below 20 as negative.

  • According to the NVKC, a positive result for smooth muscle antibodies is not yet proof of autoimmune hepatitis, a liver inflammation caused by the body's own immune system; together with a confirmed liver inflammation it is a strong sign.
  • In adults, the 2015 European liver guideline (EASL) counts a smooth muscle antibody titre of 1:40 or higher, measured by immunofluorescence, as significant.
  • A negative smooth muscle antibody result does not rule out autoimmune hepatitis: in some patients the antibodies turn positive only months later in the course of the disease.

Smooth Muscle Antibodies (SMA): what this test measures

This test detects the presence and level of smooth muscle antibodies in your blood. SMA targets proteins in smooth muscle tissue and is a key diagnostic marker for autoimmune hepatitis type 1.

Smooth Muscle Antibodies (SMA): why this value matters

Detecting SMA can help identify autoimmune hepatitis, which requires timely treatment to prevent liver damage. SMA may also be associated with primary biliary cholangitis and other liver conditions. Early identification supports better long-term liver health outcomes.

Smooth Muscle Antibodies (SMA): how the blood test works

Referral
No GP referral needed. After the order we arrange the referral through ZorgDomein, within one business day; orders after 17:00 or at the weekend start on the next business day. ZorgDomein emails a barcode, and that barcode is what the draw site needs.
The draw
A blood draw from a vein in the arm, at a partner laboratory's draw site. No home kit, no finger prick.
Which test
on its own €81,-
Where
650+ draw sites run by independent laboratories across the Netherlands. Draw sites

Smooth Muscle Antibodies (SMA): when is testing worthwhile?

Testing may be recommended when liver enzyme levels are elevated without a clear cause, when symptoms of liver disease are present, or as part of an autoimmune liver disease workup. Consult a healthcare professional for interpretation of results.

Smooth Muscle Antibodies (SMA): symptoms of a high or low value

Low Levels

Absence of smooth muscle antibodies is not typically associated with specific symptoms and is generally considered within the reference range

High Levels

Fatigue, abdominal discomfort in the upper right area, jaundice (yellowing of skin and eyes), dark urine, unexplained joint pain, loss of appetite, nausea

Smooth Muscle Antibodies (SMA): causes of a low or high value

What raises the value

  • Autoimmune hepatitis

    Antibodies against smooth muscle are found in about 80 percent of people with autoimmune hepatitis, a liver inflammation caused by the body's own immune system.

  • Other liver diseases

    Antibodies against smooth muscle can also occur in other forms of liver disease.

  • Other autoimmune diseases

    Antibodies against smooth muscle are also found in other autoimmune diseases, which is why they are not specific to autoimmune hepatitis.

  • Healthy people, usually temporarily

    Antibodies against smooth muscle can be present in fewer than 3 percent of healthy people, usually temporarily.

Smooth Muscle Antibodies (SMA): lifestyle and this value

Supporting liver health through a balanced diet, limited alcohol consumption, and maintaining a healthy weight can be beneficial. Avoiding unnecessary medications that may stress the liver is also recommended. Regular medical check-ups can help monitor liver function over time.

Smooth Muscle Antibodies (SMA): frequently asked questions

What is autoimmune hepatitis?

Autoimmune hepatitis is a chronic condition in which the immune system attacks liver cells, causing inflammation. If left untreated, it can lead to serious liver damage. SMA testing is one of the key tools used in its diagnosis.

Can SMA be positive without liver disease?

In rare cases, low levels of SMA can be detected in individuals without liver disease, or in those with other autoimmune conditions. A healthcare professional will consider the full clinical picture when interpreting results.

Is autoimmune hepatitis treatable?

Autoimmune hepatitis can often be managed effectively with medication that suppresses the overactive immune response. Early diagnosis and treatment are important for preventing liver damage. Your healthcare provider will determine the best approach for your situation.

Smooth Muscle Antibodies (SMA): sources

  1. NVKC, Alles over testen: Anti-gladde spier, allesovertesten.nl, geraadpleegd 2026-10-06 (retrieved 2026) allesovertesten.nl

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Smooth Muscle Antibodies (SMA)

€81,-