Alpha Fetoprotein (AFP) Fluid Test
About Alpha Fetoprotein (AFP) Fluid Test
| Field | Value |
|---|---|
| Also Known As | Amniotic Fluid Alpha-Fetoprotein, Alpha-Fetoprotein Amniotic Fluid Analysis, Maternal serum AFP, msAFP screen, AFP maternal |
| Sample Type | Amniotic fluid (collected via amniocentesis) |
| Fasting Required | No |
| Report Time | 1 to 2 weeks |
| Recommended For | Pregnant women, typically between 15 and 20 weeks of gestation, particularly those at a higher risk of foetal abnormalities |
| Price | Starting at ₹800 |
What Is an Alpha-Fetoprotein (AFP) Fluid Test?
The Amniotic Fluid AFP Test measures the level of alpha-fetoprotein (AFP), a protein produced by the developing baby's liver and yolk sac, in the amniotic fluid surrounding the fetus. Doctors use this test to screen for certain foetal abnormalities during pregnancy. The sample is collected from the amniotic fluid through a procedure called amniocentesis. This test is also known as AFP in amniotic fluid analysis or amniotic fluid alpha-fetoprotein analysis.
What Does an Alpha-Fetoprotein (AFP) Fluid Test Measure?
The test measures a single key marker in the amniotic fluid. Here is what it analyses and why it matters.
| Parameter | What It Measures | Why It Matters |
|---|---|---|
| AFP in Amniotic Fluid | The concentration of alpha-fetoprotein in the fluid surrounding the baby | Abnormal levels may indicate foetal structural defects or chromosomal conditions |
AFP enters the amniotic fluid mainly through foetal urine. In a healthy pregnancy, AFP follows a predictable pattern. When the foetus has an open structural defect, AFP can leak directly into the amniotic fluid, causing concentrations to rise beyond the expected range.
Why Is an Alpha-Fetoprotein (AFP) Fluid Test Done?
This test is a key part of second-trimester prenatal screening for pregnancies with elevated risk. Below are the main reasons a doctor may recommend it.
Common Symptoms That May Require This Test
Several clinical findings may lead a doctor to request amniotic fluid alpha-fetoprotein testing. These include:
- Abnormal results on maternal blood AFP screening
- Elevated AFP detected in a routine maternal serum screen
- A family history of neural tube defects
- Abnormal findings on a prenatal ultrasound
- A previous pregnancy or a child affected by a birth defect
- Advanced maternal age at the time of pregnancy
Conditions This Test Can Help Detect
The AFP in amniotic fluid test can help identify several foetal conditions. These include:
- Open neural tube defects, such as spina bifida (where the bones of the spine do not close fully around the spinal cord) and anencephaly (where most of the baby's brain and skull do not develop)
- Abdominal wall defects, such as omphalocele (abdominal organs protruding through the navel) and gastroschisis (organs protruding through a hole in the abdominal wall)
- Congenital kidney disease
- Oesophageal atresia (incomplete formation of the food pipe)
- Foetal distress, including threatened miscarriage, prematurity, or foetal demise
- Increased risk of chromosomal conditions such as Down syndrome or Edwards syndrome (trisomy 18) when AFP levels are unusually low
Alpha Fetoprotein (AFP) Fluid Test During Pregnancy
The amniotic fluid AFP test is routinely offered as part of prenatal screening, typically between 15 and 20 weeks of pregnancy. It is a core component of second-trimester screening for pregnancies considered at higher risk. The test screens for foetal structural abnormalities and chromosomal conditions during this specific window of pregnancy.
How to Prepare and What to Expect
Because this test involves an invasive sample collection procedure, a little preparation goes a long way. Here is what you need to know before your appointment.
Do You Need to Fast?
No fasting is required for this test. You may eat and drink normally before the procedure.
Practical Tips Before Your Test
A few steps can help the procedure go smoothly. Keep the following in mind:
- In early pregnancy, having a full bladder helps position the uterus better. In a later pregnancy, the bladder should be empty to reduce the risk of accidental puncture.
- Speak with your doctor or a genetic counsellor before the procedure to understand what the results may mean for you.
- Inform your doctor of any medications you are taking, particularly blood thinners.
- Ensure you have had a recent ultrasound to confirm your gestational age, foetal position, and placental location before the test.
Step-by-Step Procedure
The sample for this test is collected via amniocentesis, performed by a trained specialist. Here is what happens during the procedure:
- You lie on your back, and your abdomen is cleaned with an antiseptic solution.
- If needed, a local anaesthetic is applied to numb the area.
- Using continuous ultrasound guidance, a thin hollow needle is carefully passed through the wall of the abdomen and into the amniotic cavity.
- A small amount of amniotic fluid (around 15 to 20 mL) is gently drawn out through the needle.
- The needle is removed, and the area is checked. You may be asked to rest briefly before leaving.
- The collected fluid sample is sent to the laboratory for AFP analysis, and results are typically available within 1 to 2 weeks.
Factors That Can Affect Accuracy
Certain factors may influence the reliability of your results. These include:
- Contamination of the amniotic fluid sample with foetal blood, which can cause abnormally high AFP readings
- Inaccurate dating of the pregnancy, as AFP levels change with gestational age
- Multiple pregnancies (such as twins) and gestational diabetes, which can affect AFP concentrations
- Prior treatment with mouse monoclonal antibody preparations, which may produce falsely elevated results
Understanding Your Alpha-Fetoprotein (AFP) Fluid Test Results
Results from this test are expressed as multiples of the median (MoM), a measure that compares your AFP level to the expected level for your stage of pregnancy. Always review your results with your doctor, as context matters.
| Parameter | Normal Range | Possible Concern if High | Possible Concern if Low |
|---|---|---|---|
| AFP in Amniotic Fluid | 2.0 MoM or below | Neural tube defects, abdominal wall defects, congenital kidney disease, foetal distress | Increased risk of chromosomal conditions such as Down syndrome or Edwards syndrome |
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 circumstances can alter AFP readings independently of any foetal abnormality.
- Multiple pregnancies, gestational diabetes, and cigarette smoking can all affect AFP levels.
- Ethnic background may also play a role, with slightly higher levels observed in some groups and lower levels in others.
- Contamination of the amniotic fluid with foetal blood artificially raises AFP values.
- Previous exposure to mouse monoclonal antibody treatments may also produce falsely elevated readings. Your doctor will take all of these factors into account when reviewing your results.
How to Maintain Healthy Levels
While AFP levels cannot be directly controlled, these general steps support a healthy pregnancy:
- Confirm your gestational age accurately via ultrasound before the test, as correct dating is essential for interpreting AFP results.
- Attend all recommended prenatal care appointments throughout your pregnancy.
- Take folic acid supplements before and during early pregnancy, as advised by your doctor, to help reduce the risk of neural tube defects.
Lupin Diagnostics Alpha-Fetoprotein AFP Fluid Test Price
The Alpha-Fetoprotein AFP Fluid Test starts at approximately ₹800. The test requires a visit to a Lupin Diagnostics centre.
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹800 |
| Hyderabad | ₹800 |
| Chennai | ₹800 |
| Bangalore | ₹800 |
| Kolkata | ₹800 |
| Pune | ₹800 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred centre location.
- Visit the centre at your scheduled time for sample collection.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Frequently Asked Questions
The amniotic fluid alpha-fetoprotein test measures the amount of AFP protein in the fluid surrounding your baby during pregnancy. It is a screening tool used to assess the risk of certain foetal structural defects and chromosomal conditions. It does not provide a definitive diagnosis on its own; abnormal results require further testing.
The test is generally performed between 15 and 20 weeks of pregnancy, with the optimal window being 14 to 18 weeks of gestation. Testing outside this window may affect the reliability of the results, so timing is important.
The sample is collected through amniocentesis. A specialist uses a thin, hollow needle guided by ultrasound to draw a small amount of amniotic fluid from the womb. The procedure is performed in a clinical setting and takes only a few minutes.
Amniocentesis is generally considered safe, but it does carry some small risks. When performed after 15 weeks of pregnancy, the estimated risk of miscarriage is up to 1 in 200. There is also a small risk of vaginal bleeding (around 2% to 3%) and, rarely, premature rupture of membranes. Your doctor will discuss these risks with you before the procedure.
Elevated AFP in amniotic fluid may suggest the presence of an open neural tube defect such as spina bifida or anencephaly, an abdominal wall defect, congenital kidney disease, or a situation involving foetal distress. Incorrect gestational dating can also produce a high reading. Further confirmatory testing is always required before any conclusions are drawn.
An abnormal result is not a diagnosis. Your doctor will typically arrange confirmatory testing, which may include acetylcholinesterase (AChE) analysis of the amniotic fluid and a detailed ultrasound scan. These tests together help build a clearer picture of your baby's health.
No, home sample collection is not possible for this test. Because the sample must be collected through amniocentesis, the procedure must be carried out by a trained obstetrician in a clinical or hospital setting under ultrasound guidance.
Alpha Fetoprotein (AFP) Fluid Test
