PCT – Everything You Need to Know

PCT is an important and versatile parameter that plays an important role in the diagnosis and therapy of various diseases. Therefore, it is important that you know the basics of this parameter.

We will give you a comprehensive overview of PCT in this article. We will talk about the definition, biochemistry, occurrence and formation, elevation in inflammation, lack of or marginal elevation, what PCT says and why PCT is determined.

We will also explain when PCT is elevated and how it helps guide therapy. We will fully focus on your needs to help you gain a better understanding of PCT.

What is PCT / Procalcitonin?

Procalcitonin (PCT) is a biomarker that circulates in the serum and is used as an indicator of bacterial infection. It is best compared to other markers used in viral infection to identify and treat sepsis early. Therefore, it is considered one of the most important diagnostic and therapeutic tools in critical care medicine. PCT can also be useful as an important tool for detecting and monitoring infections, and in many cases can be used with high probability as a better tool than culture methods.

Why is PCT measured?

It is important to understand when your doctor determines PCT to ensure that you receive the best possible treatment for your condition. PCT, or procalcitonin, is a hormone produced by the body when there is inflammation or infection. It can be determined by a blood test and is an important indicator in the diagnosis and treatment of various diseases. It is important to know that PCT can not only indicate infections, but can also be elevated in certain cancers, autoimmune diseases and inflammation. PCT is a very accurate and reliable marker for the diagnosis and treatment of various diseases.

When is the PCT elevated?

If you have inflammation or infection, your doctor can determine the PCT level to personalize treatment and prevent serious complications. An increase in PCT level indicates severe, systemic inflammation or infection. An increase in PCT level may indicate the following conditions:

  • Immune system diseases:
    Systemic lupus erythematosus
    Rheumatoid arthritis
  • Infections:
    Viral infections
    Bacterial infections
    Fungal infections
  • Cancer:

In addition, an elevation in PCT levels may indicate an injury, surgery, or other type of trauma. To determine if an elevated PCT level indicates any of the above diseases or conditions, your doctor will need to perform further tests. This will allow him or her to adjust treatment and avoid serious complications. With the help of the results obtained, your doctor can make therapy management more effective and speed up healing.


Biochemistry is a very important field of knowledge that allows us to understand the importance of proteins and other molecules, and allows us to develop a better understanding of the diseases that occur. As far as biochemistry is concerned, there are some important issues to be aware of:

  • Patients: Biochemistry can help diagnose viral infections and infection from bacteria by determining the concentration of proteins and other molecules in the body.
  • Bacterial endotoxins: Bacterial endotoxins can also play an important role in diagnosing bacterial infections and can be determined by analyzing blood or urine.
  • Elevated levels: Elevated levels of proteins and other molecules can help diagnose a bacterial or viral infection and recommend treatment.

Procalcitonin is a hormone produced mainly in the liver and procalcitonin can be measured in the blood. It is closely related to C-reactive protein (CRP), which makes it very useful for diagnosing abdominal infections or inflammation, and is detectable in the blood.

Procalcitonin also allows physicians to measure viral concentrations to quickly find efficient treatment options. In addition, there are many other applications where procalcitonin is used as a marker. In this way, diseases can be better diagnosed and their severity assessed.

In combination with other tests, these measurements help physicians to establish an individually tailored therapy course for their patients. Procalcitonin can therefore be used to detect and treat disease symptoms at an early stage. This possible use of the hormone shows the potential that lies in the correct interpretation of certain values: Optimized treatment successes for both acute and chronic disease patterns can now be achieved with the help of precise laboratory test values – this is where procalcitonin plays an important role.

Occurrence and Formation

Personally presented, procalcitonin produces a driving force. It is found in both bacterial and viral infections and is primarily produced in pneumonias and acquired respiratory infections:

  • Bacterial infections
  • Viral infections
  • Pneumonias
  • Acquired pneumonia
  • Descending infection.

Procalcitonin has the potential to aid in the diagnosis of difficult-to-diagnose diseases – particularly those with acute symptoms of inflammation. With its ability to rapidly assess the severity of inflammation, it represents an important step in the fight against life-threatening diseases.

This insight opens the door for us to conduct more research and gain knowledge about the pathophysiology of procalcitonin.

Elevation in Inflammation

When you have inflammation, your PCT levels may increase, giving you a better understanding of how your body responds to infection and inflammation. An elevated procalcitonin level can be a sign of an infection or inflammation that needs to be treated. Some of the main reasons for an elevated PCT level are:

  1. Suspected clinical diagnosis: an elevated procalcitonin level may indicate an infection or inflammation that requires treatment.
  2. Intensive Care Unit: An elevated procalcitonin level may be indicative of a serious infection or inflammation that requires intensive treatment.
  3. Procalcitonin-COVID disease: an elevated procalcitonin level may indicate severe COVID-19 disease.
  4. C-reactive protein: An elevated procalcitonin level may indicate severe inflammation requiring treatment.

Elevation of procalcitonin levels can be determined by evaluating symptoms and laboratory test results. Based on the above information, an elevated PCT level may indicate a severe infection or inflammation that requires treatment. Therefore, it is important that you see a doctor and discuss the information gathered in order to receive appropriate treatment.

Absence or Slight Elevation

A mild or slight elevation in procalcitonin levels may indicate an early infection or inflammation that requires medical attention. Evaluation of a procalcitonin immunoassay is an important component in the diagnosis of infection. One study has shown that a low procalcitonin level in ambulatory patients indicates stable disease, while an elevated PCT level indicates current or recent infection.


When determining PCT levels in sepsis, it is also important to consider other markers of infection, as these are often indicative of sepsis. These include CRP (C-reactive protein), procalcitonin, and other inflammation-related markers. Clinical signs and history should also be considered when diagnosing sepsis. In this way, the best diagnostic results can be obtained.

Early diagnosis of sepsis is important because treatment must be started early to reduce the risk of serious complications. Therefore, it is important to use all available information for diagnosis and interpret it in the context of other results to achieve a reliable outcome. With the correct diagnosis, treatment can be initiated early to avoid serious complications. Therefore, it is important that all available diagnostic information is considered, including PCT values. This can improve the early diagnosis of sepsis and allow treatment to be initiated immediately. But what does PCT tell us anyway?


You are now familiar with the basics of PCT. The PCT test is an important diagnostic method for detecting inflammation and monitoring treatment outcomes. It is important to understand that an elevated PCT level does not always indicate inflammation. A low PCT level can be equally important and may be a sign of a high-risk infection. Awareness of the importance of PCT can enable early diagnosis and treatment to minimize the risk of complications. By thoroughly understanding the PCT test, its significance, occurrence and use, you can better understand and monitor treatment and outcomes.

If you are looking for PCT testing and other inflammation markers then you have come to the right place! Discover our product range – Click here to go to our product categories.

Frequently Asked Questions

What is Procalcitonin?

Procalcitonin is a protein that is produced in the body during bacterial infections and serves as a marker.

How is Procalcitonin Measured?

Procalcitonin is measured by a blood test.

What are Normal Procalcitonin Levels?

Normal procalcitonin levels are usually below 0.5 ng/mL (nanograms per milliliter) in the blood.

What do High Procalcitonin Levels Mean?

High procalcitonin levels may be an indication of a bacterial infection in the body, as procalcitonin is only elevated in bacterial infections.

How can Procalcitonin Help Diagnose Bacterial Infections?

Procalcitonin can help diagnose bacterial infections because it serves as a marker for such an infection.

How can Procalcitonin Help Monitor Bacterial Infections?

Procalcitonin can also be used in monitoring the course of disease in bacterial infections, as its concentration in the blood correlates with the severity of the infection.

What are the Advantages of Using Procalcitonin in Medical Practice?

The use of procalcitonin as a diagnostic marker can help improve the diagnosis of bacterial infections and reduce the use of antibiotics.

What are the Limitations of Using Procalcitonin as a Diagnostic Marker?

The use of procalcitonin as a diagnostic marker also has limitations, as it may be elevated in other conditions such as autoimmune diseases and tumors.

How is Procalcitonin Used in Clinical Practice?

Procalcitonin is used in clinical practice to diagnose and monitor bacterial infections and can also help in deciding whether to use antibiotics.

How can the Measurement of Procalcitonin be Improved in Medical Practice?

Measurement of procalcitonin in medical practice can be improved by standardized measurement procedures and improved interpretation of results.

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