Angiotensin-Converting Enzyme (ACE) Test
About Angiotensin-Converting Enzyme (ACE) Test
| Field | Value |
|---|---|
| Also Known As | Serum Angiotensin-Converting Enzyme (SACE), ACE Level Test, Serum ACE Test |
| Sample Type | Venous blood (serum) |
| Fasting Required | Not mandatory; some providers recommend up to 12 hours of fasting |
| Report Time | 24 to 48 hours (may vary by laboratory) |
| Recommended For | Adults and children; all genders |
| Price | Starting at ₹400 |
What Is an Angiotensin-Converting Enzyme (ACE) Test?
The angiotensin-converting enzyme (ACE) test measures the level of ACE, an enzyme that plays a key role in regulating blood pressure. It is most often ordered when a doctor suspects sarcoidosis, a condition that causes small clumps of inflammatory cells to form in various organs. Also known as the serum ACE test or ACE level test, it uses a blood sample drawn from a vein. The test is suitable for both adults and children.
What Does an Angiotensin-Converting Enzyme (ACE) Test Measure?
The ACE blood test measures the activity of angiotensin-converting enzyme in your blood. This enzyme helps convert angiotensin I into angiotensin II, a substance that causes blood vessels to narrow and blood pressure to rise. Abnormal ACE activity can point to a range of conditions, particularly those involving inflammation of organ tissue.
The test measures a single key marker:
| Parameter | What It Reflects |
|---|---|
| ACE Activity | The level of ACE enzyme in the blood, expressed in units per litre (U/L) |
Why Is an Angiotensin-Converting Enzyme (ACE) Test Done?
Doctors order the ACE test when certain symptoms or clinical findings suggest an underlying condition involving the lungs, liver, or other organs.
Common Symptoms That May Require This Test
A doctor may recommend the serum ACE test if you experience any of the following:
- Persistent dry cough
- Shortness of breath
- Unexplained fatigue
- Unexplained weight loss
- Sore or stiff joints
- Skin rashes or nodules
- Problems related to eyesight
Conditions This Test Can Help Detect
The ACE level test can help identify several conditions. These include:
- Sarcoidosis (the primary use of this test)
- Gaucher disease, a rare inherited condition involving fat build-up in organs
- Leprosy
- Untreated hyperthyroidism (overactive thyroid)
- Psoriasis
- Amyloidosis (abnormal protein build-up in tissues)
- Histoplasmosis (a fungal infection)
Angiotensin-Converting Enzyme (ACE) Test for Chronic Disease Monitoring
The ACE test is regularly used to track sarcoidosis over time. Because ACE activity tends to rise and fall alongside disease activity, repeated testing helps doctors assess the severity of the condition and whether treatment is working. If levels were elevated at diagnosis, the test can indicate whether corticosteroid therapy is effective.
How to Prepare and What to Expect
Preparation for the ACE blood test is straightforward, but a few steps will help ensure accurate results.
Do You Need to Fast?
Fasting is not strictly required for this test. However, some providers recommend avoiding food and drink for up to 12 hours before the sample is taken. Follow your doctor's specific instructions, as they may vary.
Practical Tips Before Your Test
Keep the following points in mind before your appointment:
- Tell your doctor about all medications you are taking, especially blood pressure medicines and steroids, as these can affect results
- Do not stop any medication without speaking to your doctor first
- Wear clothing with loose or short sleeves for easier access to your arm
- Stay well-hydrated to help make veins easier to locate
Step-by-Step Procedure
Here is what to expect during your blood sample collection:
- A healthcare professional wraps an elastic band around your upper arm to make the veins more visible.
- The skin over the vein is cleaned with an antiseptic.
- A needle is gently inserted into a vein, usually on the inside of the elbow or the back of the hand, and blood is drawn into a sealed vial.
- The elastic band is removed, and the needle is withdrawn.
- A small piece of cotton or gauze is pressed over the puncture site to stop any bleeding.
- A bandage is applied, the sample is labelled, and it is sent to the laboratory for analysis.
Factors That Can Affect Accuracy
Several factors can influence your ACE test result:
- Use of ACE-inhibitor blood pressure medicines (such as captopril or enalapril) can reduce levels significantly
- Steroid medicines may lower ACE activity
- Smoking can reduce ACE activity by approximately 30%
- Exposure to tuberculosis, beryllium, or airborne chemicals
- Breakdown of red blood cells (haemolysis) or high blood fat in the sample may falsely lower readings
Understanding Your Angiotensin-Converting Enzyme (ACE) Test Results
Your results should always be reviewed with a doctor who can consider them alongside your symptoms and medical history. The table below shows general reference ranges by age group.
| Age Group | Normal Range | Unit |
|---|---|---|
| 0 to 6 years | 18 to 90 | U/L |
| 7 to 14 years | 24 to 121 | U/L |
| 15 to 17 years | 18 to 101 | U/L |
| 18 years and older | 16 to 85 | U/L |
Note: ACE activity in healthy children can be 20 to 50% higher than in healthy adults. This is a normal physiological variation.
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
High ACE levels may be associated with sarcoidosis, Gaucher disease, histoplasmosis, hyperthyroidism, lymphoma, tuberculosis, leprosy, rheumatoid arthritis, or pulmonary fibrosis, among other conditions.
Low ACE levels may be linked to chronic obstructive pulmonary disease (COPD), emphysema, lung cancer, cystic fibrosis, hypothyroidism, or the use of ACE-inhibitor medications.
Results During Special Conditions
Certain situations can directly alter your ACE reading:
- Patients taking ACE-inhibitor medications will show extremely low or even unmeasurable ACE activity. Always inform your doctor if you take these medicines.
- Corticosteroids may slightly reduce ACE values.
- Low thyroid hormone levels or conditions such as anorexia nervosa may also lower serum ACE activity.
- Haemolysis (red blood cell breakdown) or high blood fat in the sample can falsely lower ACE readings.
How to Maintain Healthy Levels
These general tips support overall health and are not a substitute for medical treatment:
- Avoid smoking, as it can noticeably reduce ACE activity
- Follow your doctor's advice regarding medications that may affect your results
- Attend regular follow-up appointments if you are being monitored for sarcoidosis or a related condition
Lupin Diagnostics Angiotensin-Converting Enzyme (ACE) Test Price and Home Collection
The ACE test price in India varies by city, with options starting at ₹400. Home sample collection is available, making it convenient to get tested without having to visit a centre. The table below shows approximate prices across major Indian cities.
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹600 |
| Bangalore | ₹600 |
| Chennai | ₹600 |
| Hyderabad | ₹600 |
| Pune | ₹600 |
| Kolkata | ₹600 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Follow these steps to book your ACE test through Lupin Diagnostics:
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
Lupin Diagnostics offers home collection for the ACE blood test across multiple cities in India. All samples are processed in NABL-accredited laboratories by experienced professionals. Digital reports are delivered directly to you, so there is no need to visit the lab to collect results.
Frequently Asked Questions
The ACE test is primarily used to help diagnose and monitor sarcoidosis, a condition in which inflammatory nodules form in organs such as the lungs. It may also support the diagnosis of other granulomatous conditions. Your doctor will use the result alongside other tests and clinical findings.
No. It is possible to have a normal ACE level test result and still have sarcoidosis. The test is not definitive on its own and must be interpreted with imaging, biopsy findings, and clinical assessment. Your doctor will consider all these factors together.
Fasting is generally not required. Some providers may suggest avoiding food and drink for up to 12 hours before the test. Follow the specific instructions given by your doctor or the collection centre.
Yes. Blood pressure medicines known as ACE inhibitors, such as captopril or enalapril, can reduce ACE activity to very low or undetectable levels. Steroids can also lower results. Always tell your doctor about every medicine you are taking before the test.
Healthy children and infants naturally have higher ACE activity than adults. This is a normal variation and not a cause for concern. Reference ranges for the ACE blood test are adjusted by age group to account for this difference.
The frequency depends on your disease activity and your doctor's judgement. Regular ACE test monitoring helps assess whether the condition is improving, stable, or worsening, and whether treatment such as corticosteroids is having the desired effect.
Doctors often order additional tests at the same time. These may include a liver panel, a complete blood count (CBC), and calcium levels in both blood and urine. Chest X-rays and tissue biopsies may also be requested depending on your symptoms and clinical presentation.
Angiotensin-Converting Enzyme (ACE) Test
