SGOT

The SGOT test measures the level of the aspartate aminotransferase enzyme and indicates cellular damage in various tissues, primarily the liver and heart. Elevated values are an important biochemical marker in the evaluation of clinical conditions such as hepatocellular injury or cardiac pathologies.

SGOT level analysis is used to determine the severity of liver inflammation and tissue destruction. It is particularly useful for monitoring disease activity in conditions such as viral hepatitis, toxic exposures and cirrhosis, and contributes to a careful assessment of treatment response.

Serial SGOT measurements play a supportive role in assessing the likelihood of cardiac damage. Enzyme elevation may be associated with myocardial stress or injury and, when interpreted together with other cardiac markers, allows accurate diagnostic guidance.

SGOT trend evaluation is important for understanding the organ effects of systemic diseases. Regular follow-up helps monitor liver stress due to metabolic disorders or drug-related toxicities and supports the planning of long-term clinical management strategies.

What Is SGOT?

SGOT (Serum Glutamic Oxaloacetic Transaminase) is an enzyme found in the liver, heart and muscle tissue. It is also known as AST (Aspartate Aminotransferase). SGOT levels are used particularly in the evaluation of liver damage, heart attack or muscle diseases. High levels in the blood may indicate damage in one of these tissues. It is important that it is interpreted together with other liver enzymes.

Why is SGOT not just a “liver test”?

Although this test is often referred to as a “liver function test”, the AST (SGOT) enzyme is not found only in the liver. It has a fairly widespread distribution in the body, and this is very important for us before starting IVF treatment.

The main tissues and organs where the AST enzyme is present in high concentrations are:

• Liver (the highest amount is here)
• Heart muscle
• Skeletal muscles (muscles in your arms and legs)
• Kidneys
• Brain
• Red blood cells (erythrocytes)

For us this list means the following: when your AST level in the blood is found to be high, this may certainly be due to your liver, but it may also originate from your heart, muscles or kidneys. An elevated AST level alone is not sufficient to immediately say “there is a problem in your liver”. It is merely a “signal” and we have to investigate the cause.

For example, if you performed very strenuous exercise or engaged in intense physical activity that strained your muscles the day before the test, AST leaking from micro-tears in the skeletal muscles may temporarily increase your blood level. This is not a pathological condition, but a physiological response.

Similarly, the use of certain medications can also affect AST levels. Some frequently used drugs are among them:

• Cholesterol-lowering drugs (statins)
• Certain antibiotics
• Painkillers such as paracetamol (especially in high doses)
• Antifungal medications

Therefore, when interpreting your test results, we always ask about the activities you have done and the medications you have used in the days before the test. If we suspect such a temporary cause, we usually ask you to rest for a while, change the medication (under medical supervision), and repeat the test.

What is the difference between SGOT (AST) and ALT?

To understand the source of elevated AST (SGOT), the most important partner we look at is the ALT (Alanine Aminotransferase) enzyme. The old name of ALT is SGPT.

You can think of these two enzymes as a detective team. AST is like a “roaming” detective that looks in many places and conducts a broader investigation. ALT, on the other hand, is the “local” detective specialized mainly in the liver. Unlike AST, ALT is concentrated much more specifically in liver cells.

Therefore, an elevation in ALT almost always directly indicates damage to liver cells.

For us, the most valuable information is not the elevation of these two enzymes alone, but their ratio to each other (AST/ALT ratio or De Ritis ratio). This ratio provides very important clues about the source of the problem.

Here are some basic interpretations we make based on this ratio:

• If ALT > AST (Ratio < 1): This is the pattern we see most frequently. When ALT is higher than AST, this usually indicates direct damage to liver cells. Its causes include viral hepatitis (Hepatitis B, C), drug-induced injury or one of the most common conditions we see today: non-alcoholic fatty liver disease (NAFLD).
• If AST > ALT (Ratio > 2:1): When AST is significantly higher than ALT (usually more than twice as high), we first suspect alcohol-related liver damage. Alcohol especially causes the release of the mitochondrial form of AST and thus increases this ratio.
• If AST > ALT (Ratio > 1 but < 2): This may indicate that the damage in the liver has become chronic and is progressing towards cirrhosis.

Only AST is high while ALT is normal: This is the situation that largely clears the liver. The source of the signal is very likely extrahepatic. In this case, the first things we consider are a muscle- or heart-related problem. Before starting treatment, we may need to request additional tests such as CK (creatine kinase), a muscle enzyme, or cardiac markers (troponin) to clarify this situation.

Before beginning a physiologically demanding treatment such as IVF and then embarking on a nine-month pregnancy marathon, we must be sure of your overall health, and in particular of the condition of vital organs such as the heart and liver.

Why does IVF treatment affect liver enzymes?

One of the main steps in IVF treatment is the controlled stimulation of the ovaries (Controlled Ovarian Stimulation – COS). For this purpose, we give you hormonal medications (injections) called gonadotropins. The goal of these medications is to develop multiple eggs (follicles) instead of a single egg, which would normally develop in a natural menstrual cycle.

These multiple developing follicles naturally produce very high levels of estradiol (estrogen) in the body. These levels are many times higher than those seen in a natural cycle. The main organ responsible for processing, metabolizing and safely clearing this extremely high estrogen load is the liver.

Simply put, during IVF treatment we subject your liver to a temporary but intense “stress test”. Your liver has to work much harder than normal to process this high hormone load. In most healthy individuals this causes no problems and the liver can easily cope with this temporary burden. However, if there is an underlying hidden predisposition or liver sensitivity, we may observe mild elevations in liver enzymes (AST and ALT) during this stress test.

What Is OHSS (Ovarian Hyperstimulation Syndrome) and How Is It Related to SGOT?

The most serious complication of IVF treatment, although nowadays we can largely control it with the precautions we take (correct protocol and appropriate trigger injection), is OHSS.

This syndrome occurs when the ovaries respond excessively to stimulation and is usually triggered after the “trigger shot” (hCG) given to mature the eggs. In OHSS, due to certain vasoactive substances (especially VEGF) secreted by the ovaries, the walls of the blood vessels become permeable, almost like a “sieve”.

Protein-rich fluid inside the vessels leaks out into the third spaces, particularly the abdominal cavity. Some of the symptoms of this condition are:

• Marked abdominal swelling, tightness and pain (ascites accumulation)
• Nausea and vomiting
• Rapid weight gain
• Shortness of breath (if fluid also accumulates in the lungs)
• Decreased urine output
• Thickening of the blood (hemoconcentration)

It is this last item, hemoconcentration, that directly affects the liver. When the blood becomes more concentrated and viscous, blood flow to the organs slows down and becomes more difficult. Inadequate blood flow to the liver (ischemia) causes damage to liver cells due to lack of oxygen. As a result of this injury, AST (SGOT) and ALT enzymes may rise rapidly and sometimes to very high levels.

The most important and reassuring information here is that enzyme elevation caused by OHSS is almost always temporary. As the syndrome regresses, the body re-establishes fluid balance and blood flow returns to normal (usually within 10 days to a few weeks), and liver enzymes quickly return to normal levels without leaving permanent damage.

Is Pre-Existing Fatty Liver Disease (NAFLD) a Contraindication to IVF Treatment?

Today, due to changing lifestyles, dietary habits and the increasing prevalence of metabolic syndrome (predisposition to diabetes, high blood pressure, excess weight), non-alcoholic fatty liver disease (NAFLD) is being observed more frequently in women of reproductive age.

We can often detect this condition in the ultrasound and blood tests we perform before starting treatment. So, if you have fatty liver disease, does that mean you cannot undergo IVF?

No, it is not a contraindication, but it is a very important “warning sign” for us. Large-scale studies have shown that women with stable, compensated liver disease (that is, whose overall liver function is preserved and who have not progressed to cirrhosis) have similar live birth rates after IVF treatment as healthy control groups. In other words, having fatty liver disease does not directly reduce your IVF success.

However, this condition is important for us when planning treatment. We know that individuals with fatty liver disease (NAFLD) are more prone both to developing OHSS and, more importantly, to certain complications during pregnancy. Therefore, if such a condition is detected in you, we prefer to use more cautious and modified treatment protocols (for example, lower-dose medications or a different trigger injection) to minimize the risk of OHSS.

Can SGOT Levels Predict Whether IVF Treatment Will Be Successful?

This is a critical question we often hear from our patients and one that has long been investigated in the scientific community: “Can you tell whether I will become pregnant by looking at a value in my blood or in my eggs?”

When it comes to the AST (SGOT) enzyme, the answer to this question is very clear and definite: NO.

Scientific studies have repeatedly shown that neither AST levels in the blood nor AST levels in follicular fluid (the fluid surrounding the egg) obtained during egg retrieval have any value in predicting IVF success.

In the past, it was thought that measuring enzymes in the follicular fluid, the microenvironment in which the egg develops, might give an idea about the quality of that egg. The reasoning was that a damaged or weaker egg would leak more enzymes into the surrounding fluid.

However, comprehensive and reputable scientific studies that tested this theory have shown it to be incorrect. No statistical relationship has been found between AST (SGOT) concentration in follicular fluid and any of the following:

• Number of mature (MII) oocytes obtained
• Fertilization rate
• Total number of embryos developed
• Number of top-quality (Grade 1) embryos
• Positive pregnancy test (beta-hCG)

This “negative” result actually has a very “positive” value in clinical practice. It means we should not direct you towards unnecessary, unproven, costly and unscientific “additional tests”. To predict success, we rely on proven factors such as your age, ovarian reserve (AMH), antral follicle count and the morphological (appearance-based) quality of your embryos.

If SGOT Does Not Predict IVF Success, Why Do We Test It?

This is where the true and critical importance of the AST (SGOT) test in IVF becomes clear. This test is a powerful tool that helps us predict not whether pregnancy will start, but how safely it will progress if it does start.

We view SGOT not as a “marker of success” but as a “marker of maternal health and safety”.

Large-scale studies have shown that women whose liver enzymes (especially AST) are elevated in the first trimester of pregnancy have a significantly higher risk of developing serious complications in the later stages of pregnancy.

The most important of these complications is preeclampsia (pregnancy-induced hypertension with organ involvement).

The findings of one study are particularly striking: women whose serum AST (SGOT) level was above 40 IU/L at the beginning of pregnancy were found to have a 1.6- to 1.8-fold higher risk of developing preeclampsia compared to women with normal levels. The most interesting finding was that even if these women’s enzyme levels returned to normal in the later months of pregnancy, their risk of preeclampsia remained high.

What does this tell us? Such an early enzyme elevation in pregnancy is not merely a transient phenomenon, but an early indicator of an underlying mechanism (possibly low-grade inflammation, insulin resistance or fatty liver disease) that predisposes to preeclampsia. This may be related to problems in the way the placenta, the baby’s lifeline, implants into the uterine wall (defective placentation).

Preeclampsia is not the only warning SGOT gives us. The AST/ALT ratio has also been shown to be valuable in predicting the risk of gestational diabetes. Here, the relationship is the exact opposite: a low AST/ALT ratio (that is, ALT is clearly higher than AST) indicates a higher risk of developing gestational diabetes.

Why? Because, as we mentioned earlier, a low AST/ALT ratio is generally a strong indicator of fatty liver (NAFLD). At the root of fatty liver disease lies insulin resistance in most cases. A liver that already has insulin resistance cannot cope with the additional insulin resistance burden created by pregnancy hormones in the second and third trimesters, and blood sugar levels rise.

What Happens If SGOT and Other Enzymes Rise During Treatment?

Sometimes we begin treatment with normal values, but AST and ALT levels start to rise while you are using the medications to stimulate egg growth (during the stimulation phase).

This is one of the most important warning signs that your body is over-reacting to the stimulation and that you are at high risk of developing OHSS.

In such a situation, your safety becomes our first and only priority. The most important safety step we can take is to change the plan for a “fresh embryo transfer”.

We proceed as follows:

• Use a different medication called a ‘GnRH agonist’ instead of hCG as the trigger shot, which almost eliminates the risk of OHSS.
• Collect your eggs as planned.
• Freeze all fertilized and normally developing embryos (Freeze-All).
• Cancel the fresh transfer for that month.

This “freeze-all” strategy is not a failure; on the contrary, it is a safety shield offered by modern medicine. In this way, we give your body time to recover from all the effects of stimulation and any possible OHSS. One or two months later, when your liver enzymes have returned to normal and your body is fully rested, we transfer your frozen embryo into a much safer and healthier uterus. This approach does not reduce your chance of pregnancy; on the contrary, by ensuring your safety it opens the way to success.

Does a Low SGOT Level Have Any Meaning?

Although we usually focus on elevated levels, we sometimes see AST levels that are below the normal range, i.e. very low. This is often overlooked, but it can provide a small clue for us.

For its activity, the AST enzyme requires a cofactor, a helper molecule: vitamin B6 (pyridoxine).

Very low AST levels, even when they do not cause any obvious symptoms, may be an indirect sign of a subclinical (hidden) vitamin B6 deficiency in the body. Vitamin B6 is involved in more than 100 enzymatic reactions that are critical not only for AST but also for egg maturation and embryo development. When we detect such a situation, advising you to review your nutritional status and, if necessary, to take vitamin B6 supplements is a simple, inexpensive and low-risk intervention to optimize the metabolic background of treatment.

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