Alanine Aminotransferase (ALT)(SGPT)

​During pregnancy, monitoring ALT is particularly important, as high levels may signal conditions like preeclampsia or HELLP syndrome, which can impact both maternal and fetal health. In this article, we’ll explore the significance of ALT testing in pregnancy, ideal ranges

ALT Testing

Alanine aminotransferase (ALT), also known as serum glutamic pyruvic transaminase (SGPT), is an analyte found on the comprehensive metabolic panel (CMP).

While ALT is predominantly found in the liver, smaller amounts of the enzyme are also present in other tissues such as the heart, skeletal muscles, kidneys, and placenta. Its presence in the liver makes it a crucial marker for liver function and damage.

​The synthesis and activity of ALT are tightly regulated in response to the body’s metabolic needs. Various factors, including hormonal signals, substrate availability (amino acids), and the overall energy state of the cell can influence ALT production and activity. Hormones like insulin and glucagon play a role in regulating ALT in the liver.

ALT in Pregnancy

The effects of pregnancy on serum ALT and AST activity levels are somewhat controversial. A slight increase in ALT and/or AST activity has been found in a few studies during the third trimester. Most studies, however, show that serum ALT and AST activity levels do not change during pregnancy or remain within the normal limits established in nonpregnant women.

High ALT in Pregnancy

High-normal ALT in the first trimester is associated with an increased risk of gestational hypertension and preeclampsia.

​ALT >25 IU/L in the third trimester is associated with liver disease in pregnancy, including ICP and preeclampsia.

Most Common Causes of High ALT in Pregnancy

• Acute Infection
• Liver Damage/Inflammation
• Oxidative Stress/Tissue Damage
• Insulin Resistance
• Autoimmune Disease
• Iron Overload/Hemochromatosis
• Certain Medications (Acetaminophen, Antidepressants)
• Wilson's Disease/Excess Copper
• Environmental Chemical Exposure
• Mycotoxin Exposure
• Vitamin D Deficiency

Low ALT in Pregnancy

ALT <10 IU/L is a biomarker of B6 deficiency. There is more research on using low ALT as a biomarker of B6 deficiency than AST.

Most Common Causes of Low ALT in Pregnancy

• Vitamin B6 (Pyridoxine) Deficiency
• Low Protein Diet
• Low Muscle Mass
• Hypothyroidism
• Gluconeogenesis Dysfunction
• Genetics

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Medical Disclaimer:
This content is for educational purposes only and is intended for licensed medical professionals. It is based on current research, subject to change, and not intended to diagnose, treat, or prevent any medical condition. This information does not replace consultation with a qualified healthcare provider. Seek professional medical evaluation and treatment from a licensed provider. Use of this information is at your own risk.

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