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Cytomegalovirus (CMV) Avidity, IgG Test: Booking, Price, and Results

About Cytomegalovirus (CMV) Avidity, IgG Test: Booking, Price, and Results

Field	Value
Also Known As	CMV Avidity Index Test, CMV Antibody Avidity Test, Cytomegalovirus IgG Avidity Test
Sample Type	Serum (venous blood)
Fasting Required	Not required
Report Time	3 days
Recommended For	All ages and genders; pregnant women with positive CMV IgM/IgG results, transplant recipients, and immunocompromised individuals
Price	Starting at ₹1,200

What is a Cytomegalovirus (CMV) Avidity, IgG Test?

The cytomegalovirus (CMV) avidity, IgG test measures how strongly your body's IgG antibodies bind to the cytomegalovirus. This binding strength helps determine whether a CMV infection is recent or occurred in the past. It is most often ordered for pregnant women who have already tested positive for CMV antibodies, as well as for transplant recipients and those with weakened immune systems. The test is performed on a blood sample and is also known as the CMV avidity index test, CMV antibody avidity test, or cytomegalovirus IgG avidity test.

What Does a Cytomegalovirus (CMV) Avidity, IgG Test Measure?

This test measures a single parameter. Here is what it measures:

Parameter	What It Tells You
CMV IgG Avidity Index	Measures the binding strength between IgG antibodies and CMV antigens. Shortly after a first-time infection, antibodies bind weakly (low avidity). Over 2 to 4 months, this binding strength increases (high avidity). The index result helps determine whether infection is recent or past.

Why is a Cytomegalovirus (CMV) Avidity, IgG Test Done?

The cytomegalovirus (CMV) avidity, IgG test helps doctors distinguish between a new (primary) CMV infection and one that happened months or years ago. This distinction is important because the timing of infection changes how it is managed.

Common Symptoms That May Require This Test

The following symptoms, particularly when combined with a positive CMV antibody result, may prompt a doctor to order this test:

Persistent fatigue without a clear cause
Fever lasting several days
Muscle aches and generalised body pain
Sore throat and swollen lymph nodes
Suspected CMV exposure during pregnancy

Conditions This Test Can Help Detect

This test helps in several clinical situations:

Distinguishing a recent (primary) CMV infection from a past or resolved one
Confirming primary CMV infection when both IgM and IgG results are positive
Assessing the risk of CMV transmission from mother to baby during pregnancy
Supporting clinical management decisions for transplant recipients

Cytomegalovirus (CMV) Avidity, IgG Test During Pregnancy

The cytomegalovirus (CMV) avidity, IgG test is a key part of antenatal screening when a pregnant woman tests positive for both CMV IgM and IgG antibodies. Primary CMV infection during early pregnancy carries the highest risk of severe consequences for the baby, including hearing loss and developmental problems. High-avidity results obtained during the first trimester (around 12 to 16 weeks) can help exclude a recent infection after conception, offering important reassurance.

How to Prepare and What to Expect

Preparation for the CMV test procedure is straightforward. Here is what you should know before going for your sample collection.

Do You Need to Fast?

No, fasting is not required for the cytomegalovirus (CMV) avidity, IgG test. You can eat and drink normally before your appointment. If you are having other tests done at the same time, check with your doctor whether those tests require fasting.

Practical Tips Before Your Test

Keep these points in mind before your appointment:

Bring a detailed clinical history including your symptoms, previous test results, and any relevant medical background, as this is required for the test.
Inform your doctor if you are taking antiviral medications or supplements, as these may affect your results.
Tell your doctor about any recent immunoglobulin therapy, as this can interfere with the accuracy of the result.
Ensure you have already undergone CMV IgG and IgM testing, as this avidity test is only applicable when the CMV IgG result is positive
Wear clothing with sleeves that are easy to roll up for a comfortable blood draw.

Step-by-Step Procedure

The sample collection process is straightforward and takes only a few minutes:

A trained phlebotomist cleans a small area on your arm with an antiseptic wipe.
A needle is gently inserted into a vein, and a small blood sample of approximately 3 ml is drawn into the appropriate tube.
The needle is removed, and gentle pressure is applied to the site to stop any minor bleeding.
The sample tube is labelled with your details immediately after collection.
The serum is separated from the blood cells promptly and stored under refrigeration.
The sample is dispatched to the NABL-accredited laboratory, where it is analysed using an enzyme immunoassay (EIA) method.

Factors That Can Affect Accuracy

Certain factors may influence your test result. Be aware of the following:

Delay in collecting or processing the sample after blood draw
Immunosuppression, which can slow down IgG avidity maturation and may produce a falsely low result
Recent serious illness or infection
Poor sample quality due to haemolysis (breakdown of red blood cells)
Testing too early or too late relative to symptom onset

Understanding Your Cytomegalovirus (CMV) Avidity, IgG Test Results

Your results show an avidity index expressed as a percentage. This percentage helps your doctor determine when the CMV infection most likely occurred. The table below provides general reference ranges used in interpretation:

Result	Avidity Index	Interpretation
Low Avidity	0.50 or below (below 50%)	Suggests infection within the previous 3 to 6 months; possible recent primary infection
Intermediate / Equivocal	0.51 to 0.59 (50% to 59%)	Borderline result; requires clinical context, particularly the trimester of pregnancy
High Avidity	0.60 or above (60% and above)	Indicates infection more than 3 to 4 months prior to testing; suggests past or resolved infection

Note: Cut-off values may vary between laboratories and test manufacturers.

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.

Results During Special Conditions

Certain situations can change how results are interpreted:

Patients with weakened immune systems (such as those on immunosuppressive therapy) may show delayed IgG avidity maturation, which can make a past infection appear more recent than it is.
Recent immunoglobulin therapy can interfere with the test and affect the measured avidity level.
An intermediate result in the first trimester is generally interpreted similarly to a high-avidity result, while the same intermediate result in the second or third trimester is interpreted more like a low-avidity result.

How to Maintain Healthy Levels

While CMV cannot always be avoided, the following hygiene practices can reduce the risk of exposure.

Wash your hands thoroughly and regularly, especially after handling a young child's nappies, saliva, or nasal secretions.
Avoid sharing food, drinks, or utensils with someone who has an active CMV infection.
Pregnant women should take extra care around young children in nursery or childcare settings, where CMV spreads easily.

Lupin Diagnostics Cytomegalovirus (CMV) Avidity, IgG Test Price and Home Collection

The CMV test cost at Lupin Diagnostics starts at ₹1,200, and home sample collection is available across cities in India. The table below shows indicative prices:

City	Approximate Price (₹)
BHOPAL	1200
CHENNAI	1200
HYDERABAD	1200
KOLKATA	1200
NAVI MUMBAI	1200
PUNE	1200

Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.

How to Book

Follow these steps for CMV test online booking:

Select the cytomegalovirus (CMV) avidity, IgG 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 3 days.

Home Collection

CMV test home collection is available across major cities in India through Lupin Diagnostics. All samples are processed in NABL-accredited laboratories, ensuring accurate and reliable results. Your digital report is shared securely via email or WhatsApp once ready.

Frequently Asked Questions

The cytomegalovirus (CMV) avidity, IgG test measures how strongly your antibodies bind to the virus, which helps determine whether an infection is recent or occurred in the past. It is especially useful during pregnancy and for transplant recipients to guide clinical decisions.

This test is most useful in the first trimester, typically between 12 and 16 weeks of pregnancy. A high-avidity result at this stage can help exclude an infection that occurred after conception, which is reassuring for both the mother and the baby.

A low-avidity result suggests a primary CMV infection within the previous 3 to 6 months. This may indicate a higher risk of transmitting the virus to the baby and warrants further clinical evaluation by your doctor.

At Lupin Diagnostics, the report for the cytomegalovirus (CMV) avidity, IgG test is delivered within 3 days of sample collection. You will receive your report digitally via email or WhatsApp.

A high-avidity index strongly suggests that infection occurred more than 3 to 4 months before testing, which is reassuring. However, results should always be read alongside IgM findings and clinical history. Your doctor is best placed to give a complete interpretation.

No, fasting is not required for this test. You can eat and drink as usual before your appointment. If other tests are being done at the same time, check with your doctor whether any require fasting.