Everything you need to know about the ALP value in your blood report (Alkaline Phosphatase - ALP)

Have you ever had a blood test, picked up the report, looked at the letters and numbers on it, and thought, "What is this?" Among the many letters like ALT, AST, and GGT, you may have also seen a value called "ALP." Many people get a little worried when they see this. So, today we'll talk about what this Alkaline Phosphatase, or ALP for short, is, what it looks for in this test, and what we need to know when its values ​​change.

What exactly is ALP?

Simply put, Alkaline Phosphatase (ALP) is an enzyme found throughout our bodies. An enzyme is a special type of protein found inside our cells. Like a speeding machine in a factory, these enzymes help and speed up various chemical processes in our bodies. There are thousands of these enzymes in our bodies.

Although doctors have been researching ALP for years, they still don't know 100% for sure what its exact function is. However, it has been found to be involved in many important processes in the body.

When talking about ALP, it is often referred to as a "liver enzyme." The reason for this is that ALP is mostly found in our liver. But it is not limited to the liver. It is found in other places as well.

• Your bile ducts: Tubes that carry bile produced by the liver to the gallbladder, where it is stored.
• In your bones: That means in your bones.
• In the kidneys.
• Intestines.
• Placenta of pregnant mothers.

So, if the ALP level in your blood is abnormally high or low, it's a sign that there may be some damage or a change in some process in one of these organs.

What is an ALP blood test?

An ALP blood test measures the amount of ALP in your blood. As we mentioned earlier, although ALP is found throughout the body, the two main sources of ALP that accumulates in the blood are the liver and the bones. Therefore, if the ALP level in the blood is elevated, it can be a sign of liver disease or a bone disease. But remember, an ALP test alone cannot diagnose a disease.

There are two main types of ALP tests.

1. Routine ALP test: This is the most commonly performed test. Usually, if a doctor asks you to do a `Comprehensive Metabolic Panel (CMP)` or a `Liver Panel (LFT)`, which looks at the liver, it will definitely include the ALP value.

2. ALP isoenzyme test: This is a bit of a special test. The regular ALP test only tells you how much ALP is in your blood. However, this isoenzyme test can help you determine whether the excess ALP in your blood is coming from your liver, bones, or somewhere else. If your ALP levels are very high, your doctor may order this test to find out the exact cause. However, this is a bit of a complicated and expensive test, so not all labs do it.

Why do we need this ALP test?

There may be several reasons why your doctor might order an ALP test.

• Screening: Sometimes, even if there are no symptoms, ALP is checked as part of your routine annual check-up CMP or LFT report to get a clue about a problem in the liver or elsewhere before symptoms appear.
• Monitoring: If you already have liver or bone disease, this test is also used to monitor whether the condition is improving, staying the same, or getting worse with treatment.
• As an aid in diagnosis: If you have symptoms related to a liver or bone disease, an ALP test is an important part of the diagnostic process.

Symptoms that may prompt a doctor to consider an ALP test

If you have the symptoms below, your doctor may refer you for this test.

What happens before and during the blood test?

If your doctor tells you to do this ALP test as part of a CMP, you will need to fast for about 10-12 hours. But you can drink water. However, when you are asked to do a blood test, your doctor will give you specific instructions on what to do before it. It is very important to follow those instructions.

These are the things that usually happen when blood is drawn.

1. You will be seated in a chair, and a nurse or medical officer will find a convenient vein in your arm to draw blood from. This is usually on the inside of your elbow.

2. After finding the vein, clean the area thoroughly with something like rubbing alcohol.

3. Then, a small needle is inserted into the vein and a blood sample is taken. At this time, you may feel a slight sting, like being bitten by a small ant.

4. After collecting the required amount of blood for the test into a tube, remove the needle and press the area where the blood was taken with a piece of cotton.

5. Once the bleeding stops, a small plaster is applied to the area and the job is finished.

The entire process takes less than five minutes. There may be some slight soreness and bruising where the blood was drawn. But that will go away in a day or two.

How do you understand the contents of the report?

You can usually get the report in one or two days. The report contains information like this:

• Name of the test (e.g. Alkaline Phosphatase).
• Your result (the ALP value in your blood).
• Normal range.
• Whether your value is normal, high, or low.

A generally accepted range is 44 to 147 international units per liter (44 to 147 IU/L). However, in some places this is also considered 30 to 120 IU/L.

Also, normal ALP values ​​vary depending on age and gender.

• Children and young people: Children and adolescents have naturally high ALP levels because their bones are growing.
• Between the ages of 15-50: Men have slightly higher ALP levels than women.
• With aging: ALP levels rise slightly again as we age.
• During pregnancy: It is common for pregnant mothers to have elevated ALP levels because ALP is produced in the placenta.
• When a bone fracture heals: When a bone is broken, ALP levels may increase as bone cells become active as it heals.

What does an increase in ALP mean?

If your ALP level is elevated, it's normal to feel a little worried. However, the first thing to remember is that a mildly elevated ALP level is not always a sign of a serious illness. Your doctor may decide not to do any further testing and just monitor your ALP level again in a little while.

However, a very high ALP level is a strong indication of liver damage or bone disease. If your report says ALP is elevated, your doctor may order additional tests (e.g., isoenzyme tests, liver scans) to find the cause.

The main reasons why ALP can increase can be divided into two categories.

Causes related to the liver and bile ducts

• Cholestasis of pregnancy: A liver condition that can occur during the latter part of pregnancy.
• Cirrhosis of the liver: Permanent liver damage occurs when liver cells die and are replaced by scar tissue.
• Hepatitis: Inflammation of the liver. This can be caused by viruses, alcohol, or other causes.
• Bile duct obstruction: Blockage of the duct that carries bile from the liver due to gallstones, cancerous tumors, or other causes.
• Mononucleosis: Also known as the "kissing disease," this viral infection can sometimes cause swelling of the liver.

Bone (skeletal) related causes

• Paget's disease of the bone: A rare condition in which bones break down and regrow abnormally.
• Osteogenic sarcoma: A type of cancer that begins in the bones.
• Bone metastasis: Cancer from another location, such as the breast or lungs, spreads to the bones.
• Hyperparathyroidism: Increased calcium levels in the blood due to excessive secretion of hormones by the parathyroid gland.
• Hyperthyroidism: Excessive production of hormones by the thyroid gland.
• Osteomalacia: A condition in which bones become weak and break easily due to vitamin D deficiency. When this occurs in children, we call it Rickets.
• A healing fracture.

What are the possible causes of low ALP levels?

It is very rare for ALP levels to be abnormally low, but there are several possible reasons for this.

• Malnutrition: Not getting enough nutrients the body needs.
• Zinc deficiency.
• Magnesium deficiency.
• Hypothyroidism: Decreased function of the thyroid gland.
• Rare genetic diseases: Very rare conditions such as `Hypophosphatasia` and `Wilson disease`.

Should I be worried if my ALP level is high or low?

About one in 20 healthy people may have test results outside the normal range. Other factors can also affect ALP values.

• Certain medications: Some medications, such as birth control pills.
• Your diet.
• Pregnancy.
• Age: As we discussed earlier, the value of children of growing age is high.
• An error that occurs during the collection, transportation, or testing of the blood sample.

Therefore, your doctor will never make a decision based solely on the ALP value. He will consider all of the following:

• Your complete medical history.
• What medications are you currently taking?
• How high or low your ALP value is.
• Results of other tests that were checked along with ALP (e.g. ALT, GGT, Bilirubin).
• Do you have any symptoms?

Putting all of this together will determine whether you need further testing or treatment.

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