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Published on: Apr 30, 2022
2 minute read
By: Second Medic Expert

What Is PET Scan ?

A PET scan (positron emission tomography) is a type of imaging test that uses a radioactive tracer to look for changes in the function of cells and tissues. A tracer is a substance that is introduced into the body to make it easier to see certain areas or organs. The radioactive tracer used in PET scans emits positrons, which are tiny particles that collide with electrons in the body. This creates gamma rays that can be detected by a scanner and used to create images of the inside of the body. PET scans are often used to diagnose cancer because tumor cells typically have higher levels of activity than normal cells. They can also be used to check for treatment response, measure tumor size, and identify new tumors.

PET Scan is a nuclear medicine imaging test that uses a small amount of radioactive material, called a tracer, to look for disease in the body. A PET Scan can show how well organs and tissues are working. It can help find cancer, heart problems, and other diseases. A Positron Emission Tomography (PET) scan is a medical imaging test that helps physicians diagnose and treat diseases. PET scans use a small amount of radioactive material, called a tracer, to help physicians see how organs and tissues are functioning. The radioactive tracer is injected into the patient's body and travels to the organ or tissue being studied. Physicians can then see where the tracer collects on an image of the organ or tissue.

A PET scan is helpful in diagnosing cancer, heart disease, brain disorders, and other diseases. It can also help determine how well treatment is working. PET Scan is an acronym for Positron Emission Tomography. It's a type of medical imaging that uses a small amount of radioactive material to help diagnose and treat medical conditions. A PET scanner creates 3D images of the inside of the body. PET (positron emission tomography) scans use a small amount of radioactive material called a tracer to help doctors see certain areas of the body. The tracer is injected into a vein, and images are taken as it moves through the body.

PET scans are often used to find cancer because tumors absorb more of the radioactive material than normal tissue does. PET scans can also be used to measure blood flow, check how well drugs work, and see how active the brain is. A PET scan is a type of imaging test that uses radioactive tracers to look at the function and structure of organs and tissues in your body. A small amount of radioactive material is injected into your bloodstream and then scanned by a special camera. The camera creates pictures that show where the material has collected. This can help doctors see how well an organ is working or find tumors or other problems.

PET scan is short for positron emission tomography. It's a type of medical imaging that uses a radioactive tracer to look at organ function or tissue metabolism. The tracer is a small amount of radioactive material that's injected into the patient's bloodstream. It collects in organs and tissues, and a scanner detects the radiation emitted as it decays. This information is used to create cross-sectional images of the body that show how the organs and tissues are working. PET scans are most often used to detect cancer because tumors consume more energy than normal tissue and therefore have a higher metabolic rate. But they can also be used to evaluate other problems, such as heart disease, brain function, and joint damage.

PET scanning is a type of nuclear medicine imaging. A small amount of radioactive glucose (FDG) is injected into a vein and images are taken as the glucose moves through the body. Cancer cells use more energy than normal cells and therefore absorb more of the radioactive glucose. This allows tumors to be visualized on the scan. PET stands for Positron Emission Tomography. A PET scan is a medical imaging test that uses a radioactive tracer to look at organs and tissues inside the body. The tracer is injected into a vein, and images are taken as it moves through the body.

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Reasons Behind Low Haemoglobin in Non-Anaemic People

When people think of low haemoglobin, they often assume it's always linked with anaemia. But that’s not always true. You can have a slightly low haemoglobin count even if your red blood cell count and iron levels are still in the normal range.

So, what does it mean when non-anaemic people have low haemoglobin? Should you worry? Let’s explore the reasons behind low haemoglobin in non-anaemic people and what you can do about it.

What Is Haemoglobin?

Haemoglobin is a protein found in red blood cells that carries oxygen from your lungs to the rest of your body. The average normal levels are:

Men: 13.5 – 17.5 g/dL
Women: 12.0 – 15.5 g/dL

Levels just below the normal range may not be classified as anaemia—but they can still indicate something going on.

Common Reasons for Low Haemoglobin in Non-Anaemic People

1. Mild Nutrient Deficiencies

Even if you’re eating regularly, you could still lack key nutrients needed to build haemoglobin—such as:

Vitamin B12
Folate (Vitamin B9)
Vitamin C (helps absorb iron)

Low levels of these don’t always lead to full-blown anaemia but can reduce haemoglobin production.

2. Chronic Inflammation or Infections

Your body may produce less haemoglobin during periods of chronic inflammation—such as:

Thyroid disorders
IBS or gut issues
Low-grade infections

These may not show symptoms right away but can slightly lower your haemoglobin over time.

3. Dilution from Overhydration

If you drink too much water before a blood test, your blood plasma volume may increase and dilute your haemoglobin, giving a lower reading.

This is temporary and often not harmful, but it can confuse test results.

4. Hormonal Imbalances

Conditions like hypothyroidism can subtly affect red blood cell and haemoglobin production.

In women, heavy menstrual bleeding can cause periodic dips in haemoglobin levels—especially if not supported with iron-rich nutrition.

5. Athletic Training (Pseudo-Anaemia)

In endurance athletes or those who do high levels of cardio, the body increases plasma (fluid) volume to improve circulation. This can lower the haemoglobin concentration without reducing red cell count—this is called athlete’s pseudo-anaemia.

What Tests to Consider

If you have low haemoglobin but no signs of anaemia, your doctor may recommend:

Serum Ferritin (iron storage)
Vitamin B12 and Folate tests
Thyroid profile
CRP or ESR (for inflammation)

You can get these tests easily with home sample collection from trusted platforms like SecondMedic.com, powered by Thyrocare.

Should You Be Concerned?

If your haemoglobin is:

Slightly below normal (e.g., 11.8–12.2 g/dL)
You have no symptoms (fatigue, paleness, breathlessness)

…then it may not be an emergency. However, monitoring and lifestyle changes are still important.

If it drops further or if symptoms appear, consult a doctor immediately.

What You Can Do Naturally

Improve Your Diet

Eat leafy greens, legumes, citrus fruits
Add iron-rich foods like beetroot, dates, and jaggery
Pair iron with vitamin C (e.g., lemon + spinach)

Reduce Inflammation

Avoid excessive sugar, fried foods, and processed meals
Include turmeric, ginger, and antioxidants in your diet

Stay Active but Balanced

Don’t overtrain
Rest and hydrate well, especially before blood tests

Conclusion

Low haemoglobin without anaemia is more common than you might think. The causes are often mild and reversible, but keeping an eye on your numbers and adjusting your diet or lifestyle can make a big difference.

If you’ve been wondering about the reasons behind low haemoglobin in non-anaemic people, now you know how to understand and manage it better—naturally and confidently.

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