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AFP (Alpha Fetoprotein): Amniotic Fluid Test

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AFP (Alpha Fetoprotein): Amniotic Fluid Test

Short Name: AFP Amniotic Fluid

Also known as: Alpha-Fetoprotein Amniotic Fluid Test, Amniotic Fluid AFP Test, AFP Level in Amniotic Fluid, Prenatal AFP Screening

AFP (Alpha Fetoprotein): Amniotic Fluid Test test available at DNA Labs India for ₹936. Uses Chemiluminescent Immunoassay (CLIA) on Amniotic Fluid samples. Results in Results are typically available within 24–48 hours of sample receipt at the laboratory.. Free home collection in 300+ cities across India.

GynecologistFemalePregnant Women (15–20 Weeks Gestation)🏠 Home Collection

✍️ Written By

🩺 Medically Reviewed By

Dr Ramarao Paidisetty

Dr Ramarao Paidisetty

Consultant Biochemist · Reg: 21504

Last reviewed: September 7, 2026

Overview

The AFP Amniotic Fluid Test is performed to screen for open neural tube defects (such as spina bifida and anencephaly), ventral wall defects (omphalocele, gastroschisis), and other fetal structural abnormalities in the second trimester of pregnancy. It is part of a comprehensive prenatal screening strategy and helps clinicians identify pregnancies that may benefit from further diagnostic evaluation, including detailed ultrasound, amniotic fluid acetylcholinesterase testing, and genetic counselling. Early identification of elevated AFP allows timely clinical decision-making regarding further testing, management planning, or referral to a fetal medicine specialist.

Test Code
71
CPT Code
82106
ICD Code
O28.5
Price
₹936
Sample Type
Amniotic Fluid
Result Time
Results are typically available within 24–48 hours of sample receipt at the laboratory.
Fasting Required
No
Method
Chemiluminescent Immunoassay (CLIA)
Step 1

Sample Collection

No special preparation is required for the patient. The procedure (amniocentesis) is performed by a qualified obstetrician under ultrasound guidance. Informed consent is obtained. Blood group and Rh status should be confirmed prior to the procedure. Patients are advised to discuss risks and benefits with their healthcare provider before undergoing amniocentesis.

Method: Amniocentesis performed by a qualified obstetrician

Step 2

Laboratory Analysis

Amniocentesis involves inserting a thin needle through the maternal abdominal wall into the amniotic sac under continuous ultrasound guidance. Approximately 3 mL of amniotic fluid is aspirated into a sterile syringe. The sample is transferred immediately to a sterile screw-capped container, ensuring no contamination with maternal blood.

Step 3

Report Delivery

After collection, the patient may be advised to rest briefly and monitored for any signs of complications such as cramping, bleeding, or fluid leakage. The sample is labelled, stored, and transported as per laboratory specifications. Mild discomfort at the needle site is normal and typically resolves within a few hours.

Timeline: Results are typically available within 24–48 hours of sample receipt at the laboratory.

Patient Instructions

1
Before the Test:No special preparation such as fasting is required. The test is performed via amniocentesis, an invasive procedure. Ensure your obstetrician has confirmed gestational age (ideally 15–20 weeks), reviewed your medical history, and obtained informed consent. Blood group and Rh status should be documented. Discuss potential risks of amniocentesis, including a small risk of miscarriage, with your healthcare provider before the procedure.
2
During the Test:The procedure is performed by an obstetrician under continuous ultrasound guidance. A thin needle is inserted through the abdomen into the amniotic sac, and approximately 3 mL of amniotic fluid is withdrawn. The procedure typically takes 10–15 minutes. You may feel mild discomfort or pressure at the needle insertion site. The sample is transferred to a sterile container and sent to the laboratory for AFP analysis.
3
After the Test:After amniocentesis, you may rest for a short period at the clinic. Mild cramping or spotting is normal for 24–48 hours. Avoid strenuous physical activity for the remainder of the day. Contact your healthcare provider immediately if you experience heavy bleeding, fluid leakage from the vagina, fever, or severe abdominal pain. Results are typically available within 24–48 hours through the online portal, email, or WhatsApp.

About This Test

Who Should Get This Test

The AFP Amniotic Fluid Test is performed to screen for open neural tube defects (such as spina bifida and anencephaly), ventral wall defects (omphalocele, gastroschisis), and other fetal structural abnormalities in the second trimester of pregnancy. It is part of a comprehensive prenatal screening strategy and helps clinicians identify pregnancies that may benefit from further diagnostic evaluation, including detailed ultrasound, amniotic fluid acetylcholinesterase testing, and genetic counselling. Early identification of elevated AFP allows timely clinical decision-making regarding further testing, management planning, or referral to a fetal medicine specialist.

How to Prepare

  • Sample must be collected by a qualified obstetrician via amniocentesis under ultrasound guidance
  • Approximately 3 mL of amniotic fluid is required
  • Use a sterile screw-capped container for sample transfer
  • Avoid contamination with maternal blood during collection
  • Ship the sample refrigerated (2–8°C) or frozen (−20°C) as appropriate
  • Clearly label the container with patient details, gestational age, date, and time of collection
  • Include the requisition form with clinical indication and gestational age information

Doctor's Notes

Reviewed by — MBBS, MD (Biochemistry) · Reg. No. 21504

"Amniotic fluid AFP is a valuable second-trimester screening marker. Elevated levels warrant further evaluation with targeted ultrasonography and additional biochemical or genetic testing. A single AFP result should always be interpreted alongside gestational age, ultrasound findings, and maternal history. No prenatal screening test should replace comprehensive clinical evaluation and genetic counselling."

Last medically reviewed: September 7, 2026

Test Parameters & Specifications

Sample TypeAmniotic Fluid
Sample Volume3 mL
ContainerSterile screw-capped container
Collection MethodAmniocentesis performed by a qualified obstetrician

Sample Stability

Room Temperature (15–25°C)
Refrigerated (2–8°C)
Frozen (−20°C)
Sample Rejection Criteria:
  • Sample contaminated with maternal blood
  • Sample volume less than the required minimum (less than 1 mL)
  • Unlabelled or mislabelled sample containers
  • Sample received without a properly filled requisition form or missing gestational age information
  • Sample stored at room temperature for more than 8 hours
  • Sample received in a leaking or non-sterile container

Understanding Your Results

Amniotic fluid AFP levels are interpreted in the context of gestational age, typically expressed as Multiples of the Median (MoM). An AFP result ≥2.0 MoM above the gestational-age-specific median is generally considered elevated and warrants further investigation. A normal amniotic fluid AFP result significantly reduces the likelihood of an open neural tube defect but does not exclude all fetal abnormalities. All results must be reviewed by a qualified healthcare provider alongside ultrasound findings and clinical history.
📊

Normal AFP level. Low likelihood of open neural tube defect. Continue routine prenatal care and screening as recommended by the obstetrician.

Status: Normal

Range: < 2.0 MoM

📊

Mildly elevated. May require repeat testing or correlation with detailed ultrasound. Contamination with fetal blood during amniocentesis should be ruled out.

Status: Borderline

Range: 2.0 – 2.5 MoM

📊

Significantly elevated. Strongly suggestive of open neural tube defect (spina bifida, anencephaly), ventral wall defect, or other fetal anomaly. Further evaluation with targeted ultrasound, acetylcholinesterase testing, and genetic counselling is recommended.

Status: Elevated / Abnormal

Range: > 2.5 MoM

⚠️ When to Consult a Doctor:

Consult your obstetrician or fetal medicine specialist if your amniotic fluid AFP result is elevated (≥2.0 MoM). Also seek medical advice if you have a family history of neural tube defects, are taking antiepileptic medications, or if any abnormalities are detected on prenatal ultrasound. Early consultation allows for timely diagnostic testing, appropriate counselling, and informed decision-making regarding the management of your pregnancy.

Limitations

  • ⚠This is a screening test, not a confirmatory diagnostic test; elevated AFP does not confirm a specific defect
  • ⚠AFP levels must always be interpreted with gestational-age-specific reference ranges
  • ⚠Closed (skin-covered) neural tube defects may not elevate amniotic fluid AFP
  • ⚠Cannot detect all chromosomal abnormalities; additional genetic testing may be needed
  • ⚠Results are not standalone indicators and must be correlated with ultrasound and clinical history
  • ⚠False positives may occur due to sample contamination or incorrect gestational age

Risks & Considerations

  • ●Amniocentesis carries a small risk of miscarriage (approximately 1 in 200 to 1 in 500 procedures)
  • ●Mild cramping or vaginal spotting following the procedure
  • ●Rare risk of amniotic fluid leakage
  • ●Very rare risk of infection (chorioamnionitis)
  • ●Needle-related injury to the fetus is extremely rare when performed under ultrasound guidance
  • ●Rh sensitization in Rh-negative mothers if Rh immunoglobulin is not administered

Interfering Factors

  • ●Contamination of amniotic fluid sample with maternal blood can falsely elevate AFP levels
  • ●Incorrect gestational age estimation may lead to misinterpretation of AFP values
  • ●Multiple pregnancy (twins or higher-order gestations) can result in elevated AFP levels
  • ●Fetal blood contamination from the amniocentesis procedure itself (traumatic tap)
  • ●Fetal demise or recent fetal bleeding may alter AFP concentrations in the fluid
  • ●Hemolyzed or improperly stored samples may compromise test accuracy

Compare With Similar Tests

TestAFP (Alpha Fetoprotein): Amniotic Fluid TestMaternal Serum AFP (MSAFP)Quadruple Marker ScreenAmniotic Fluid Acetylcholinesterase (AChE)Detailed Fetal Ultrasound (Level II / TIFFA)
ComparisonAFP (Alpha Fetoprotein): Amniotic Fluid TestMSAFP is a blood-based screening test performed on the mother, while this test measures AFP directly in the amniotic fluid. Amniotic fluid AFP is more specific for neural tube defects and is typically ordered when MSAFP is abnormal.The Quad Screen measures AFP, hCG, unconjugated estriol, and inhibin A in maternal blood to assess risk for Down syndrome, trisomy 18, and NTDs. Amniotic fluid AFP focuses specifically on open NTDs and structural anomalies.AChE testing is often performed alongside amniotic fluid AFP when AFP is elevated. AChE is a more specific marker for open neural tube defects and helps differentiate true positives from false positives.A targeted ultrasound provides anatomical visualization of the fetus and can identify or exclude structural anomalies that may explain elevated AFP. It is an essential complementary investigation to any abnormal biochemical screening result.

Frequently Asked Questions

What is the AFP Amniotic Fluid Test?
The AFP Amniotic Fluid Test measures the level of Alpha-Fetoprotein (AFP), a protein produced by the fetus, in the amniotic fluid. It is a second-trimester prenatal screening test used to detect open neural tube defects (such as spina bifida and anencephaly) and other fetal structural abnormalities.
When is the AFP Amniotic Fluid Test performed during pregnancy?
This test is typically performed between 15 and 20 weeks of gestation, with the optimal window being 16 to 18 weeks. The timing is important because AFP levels in amniotic fluid change with gestational age, and results are interpreted using gestational-age-specific reference ranges.
Why would my doctor recommend an amniotic fluid AFP test?
Your doctor may recommend this test if your maternal serum AFP (MSAFP) levels are elevated on initial blood screening, if you have a family history of neural tube defects, if you are taking certain medications (such as antiepileptic drugs), or if abnormalities are detected on a prenatal ultrasound.
Is the AFP Amniotic Fluid Test the same as amniocentesis?
Amniocentesis is the procedure used to collect the amniotic fluid sample. The AFP test is a specific laboratory analysis performed on that sample. Amniocentesis can be used for many types of tests, including chromosomal analysis and AFP measurement.
What does an elevated amniotic fluid AFP level mean?
An elevated AFP level (?2.0 MoM) in the amniotic fluid may indicate an open neural tube defect (such as spina bifida or anencephaly), a ventral wall defect (such as omphalocele or gastroschisis), or other fetal structural abnormalities. However, elevated AFP does not confirm a diagnosis and requires further evaluation with ultrasound and additional tests.
Can elevated amniotic fluid AFP be caused by factors other than fetal defects?
Yes. Elevated AFP can also result from incorrect gestational age estimation, multiple pregnancy (twins), contamination of the sample with maternal or fetal blood during the amniocentesis procedure, or certain placental conditions. A repeat test or detailed ultrasound may help clarify the cause.
Does a normal amniotic fluid AFP result mean my baby is completely healthy?
A normal AFP result significantly reduces the likelihood of open neural tube defects but does not guarantee the absence of all fetal abnormalities. Some conditions, such as closed (skin-covered) neural tube defects, may not elevate AFP. Comprehensive prenatal care, including ultrasound and clinical evaluation, is essential.
What is the cost of the AFP Amniotic Fluid Test at DNA Labs India?
The AFP Amniotic Fluid Test at DNA Labs India costs ?936. This price includes home sample collection, test processing, and online report delivery. The test is available across India in major cities.
Is the AFP Amniotic Fluid Test safe for me and my baby?
The test requires amniocentesis, which is an invasive procedure carrying a small risk of miscarriage (approximately 1 in 200 to 1 in 500). Your obstetrician will discuss the risks and benefits before the procedure. When performed by an experienced specialist under ultrasound guidance, amniocentesis is considered a safe and well-established procedure.
How long does it take to get the results of the AFP Amniotic Fluid Test?
Results are typically available within 24 to 48 hours of sample receipt at the laboratory. You can access your report through the DNA Labs India online portal, email, or WhatsApp.
Does the AFP Amniotic Fluid Test require fasting?
No, fasting is not required for this test. No special dietary preparation is needed before the amniocentesis procedure or sample collection.
Is home sample collection available for the AFP Amniotic Fluid Test?
While DNA Labs India offers free home sample collection for many tests, the AFP Amniotic Fluid Test requires amniocentesis, which must be performed by a qualified obstetrician in a clinical setting under ultrasound guidance. The collected sample can then be sent to DNA Labs India for analysis. Please contact us for logistics and coordination.
Worried about the process? Our certified phlebotomists collect thousands of samples every month across India. The process takes under 5 minutes and is virtually painless. Questions? Message us on WhatsApp — we're here 7 days a week.

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