BiologyCBSE Class 12 · Reproductive Health

MTP and Amniocentesis

Updated 15 October 2026 · Fact-checked

Medical termination of pregnancy (MTP) is the intentional ending of a pregnancy before full term. In India it is legal on set grounds: up to 12 weeks with one doctor's opinion and from 12 to 24 weeks with two. Amniocentesis tests amniotic fluid for fetal chromosomal disorders, but its use for sex determination is banned to prevent female foeticide.

Notice the 12-week switch from one doctor to two, and that amniocentesis is only for chromosome checks, never for sex determination.

Illustration drawn for QuestionBuddy.

Understand MTP and Amniocentesis

MTP: what and why. Medical termination of pregnancy (MTP), also called induced abortion, is ending a pregnancy intentionally or voluntarily before full term. Worldwide, about 45-50 million MTPs take place every year, about one-fifth of all pregnancies conceived in a year. MTP is used to end unwanted pregnancies (after casual unprotected intercourse, failure of a contraceptive, or rape) and is essential when continuing the pregnancy could be harmful or even fatal to the mother, the fetus or both. Whether to accept MTP raises emotional, ethical, religious and social issues in many countries.

The law in India. The Government of India legalised MTP in 1971, with strict conditions to prevent misuse, especially to check female foeticide. Under the amended MTP Act described in NCERT:

Within the first 12 weeks: a pregnancy may be terminated on the opinion of one registered medical practitioner.
Between 12 and 24 weeks: two registered medical practitioners must be of the opinion, in good faith, that a ground exists.
Grounds: (i) continuing the pregnancy would risk the life of the pregnant woman or cause grave injury to her physical or mental health; or (ii) there is a substantial risk that the child, if born, would have physical or mental abnormalities so serious that it would be seriously handicapped.

The aim of the amendment is to reduce illegal abortions and the maternal deaths and illness they cause.

Safety. MTPs are considered relatively safe in the first trimester (up to 12 weeks). Second-trimester abortions are much riskier. A worrying trend is that many MTPs are performed illegally by unqualified quacks, which is unsafe and can be fatal. Counselling about avoiding unprotected coitus, explaining the risks of illegal abortion, and better health-care facilities can reverse this.

Amniocentesis. The developing fetus floats in amniotic fluid, which contains cells shed by the fetus. In amniocentesis a small sample of this fluid is drawn and its fetal cells and dissolved substances are analysed, for example for the chromosomal pattern.

Use (advantage): early detection of genetic disorders; NCERT names Down's syndrome, haemophilia and sickle-cell anaemia, and chromosomal conditions such as Turner's syndrome (45, XO) also show in the karyotype. It also helps judge the survivability of the fetus, so parents and doctors can decide on care or, within the law, on MTP.
Misuse (disadvantage): the chromosome pattern also reveals the sex of the fetus (XX or XY). Misuse to find the sex, followed by MTP of female fetuses, is female foeticide, which is illegal.
Hence there is a statutory ban on amniocentesis for sex determination, part of India's strategies to improve reproductive health.

Flow chart (lawful path):
prenatal test (amniocentesis) → chromosomal disorder found? → doctor's opinion (one up to 12 weeks; two from 12 to 24 weeks) → MTP on a legal ground, done by a qualified practitioner, preferably in the first trimester.
Unlawful path: amniocentesis for sex → female fetus → MTP = female foeticide (banned).

Connecting to genetics. A fetus that developed from a zygote with 45 chromosomes and one X has Turner's syndrome (XO): a sterile female with rudimentary ovaries and lack of secondary sexual characters. A fetus with 47 chromosomes including an extra 21 has Down's syndrome. Both can be seen in an amniocentesis karyotype.

Draw and label: amniocentesis. Checklist: outline of a pregnant uterus with the fetus inside the amniotic sac, a needle passing through the abdominal wall into the fluid, and an arrow to a test tube for chromosome study. Labels: uterus wall, amniotic sac, amniotic fluid, fetus, needle, sample for karyotype.

MTP and Amniocentesis: key facts

MTP time limits (India): $\leq 12 weeks: 1 doctor; 12 - 24 weeks: 2 doctors$; Doctor = registered medical practitioner, acting in good faith on a legal ground.
Safest period: $first trimester = up to 12 weeks$; Second-trimester MTPs are much riskier.
Global scale: $45 - 50 million MTPs/year \approx \frac{1}{5} of pregnancies$; So roughly 225-250 million pregnancies are conceived each year.
What amniocentesis reads: $fetal cells in amniotic fluid \to karyotype \to disorders (and sex)$; Sex determination by this test is banned in India.
Karyotypes to recognise: $45, X O = Turner; 47, + 21 = Down; 47, X X Y = Klinefelter$; Normal: 46, XX or 46, XY.

How to answer MTP and Amniocentesis questions

Questions combine a medical case with the law or ethics. Answer the biology first, then the legal or social point.

1Define the term precisely (MTP: intentional termination before full term; amniocentesis: testing amniotic fluid cells for chromosomal pattern).
2For 'why MTP', list the two kinds of reasons: unwanted pregnancy (contraceptive failure, unprotected coitus, rape) and danger to mother or fetus.
3For legal cases, check the week of pregnancy: up to 12 weeks (one doctor), 12-24 weeks (two doctors), and state the ground that applies.
4For amniocentesis, give one advantage (detects disorders early) and one disadvantage (misuse for sex determination, female foeticide).
5For a karyotype case, name the syndrome from the chromosome count, then link it to the ground 'substantial risk of serious abnormality'.
6Close with the social point: why the statutory ban exists and why MTPs by quacks are dangerous.

MTP and Amniocentesis in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Lawful use of prenatal diagnosis and MTP

Suppose a couple, in the 14th week of pregnancy, has an amniocentesis because of a family history of Down's syndrome, and the karyotype shows 47 chromosomes with three copies of chromosome 21. A relative suggests that while they are at it, the lab should also tell them the baby's sex.

Which disorder is present? Under what conditions can MTP be lawfully done at this stage? Should the lab reveal the sex? Explain.

Try it first, then show the solutionSolution

Three copies of chromosome 21 (47 chromosomes) = Down's syndrome (trisomy 21).
At 14 weeks the pregnancy is between 12 and 24 weeks, so two registered medical practitioners must agree in good faith that a legal ground exists; here, a substantial risk that the child would be seriously handicapped.
The lab must not reveal the sex: using amniocentesis for sex determination is banned by law to prevent female foeticide.

Answer: Down's syndrome; MTP is lawful only with the opinion of two registered doctors on the ground of serious abnormality; the sex must not be disclosed.

Memory hook: Test for disorders, never for daughters.

Tricks to remember MTP and Amniocentesis

Short memory aids. Say each one aloud once, then use it on a question the same day.

12-24, 1-2
Up to 12 weeks, one doctor; up to 24 weeks, two doctors.
Use it when: MTP conditions.
First is safest
First trimester = first choice for MTP.
Use it when: Safety questions.
Amnio: help or harm
Helps find disorders; harms when used to find a daughter.
Use it when: Advantage and disadvantage of amniocentesis.

MTP and Amniocentesis: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Defining amniocentesis and the ban · 2 marks · Very short answerBoard level

Define amniocentesis. Why has the government imposed a statutory ban on it for sex determination despite its medical importance?

Try it first, then show the solutionSolution

Amniocentesis: a prenatal test in which a sample of amniotic fluid is taken and the fetal cells in it are examined for chromosomal pattern, to detect genetic disorders (1 mark).
Because the chromosome pattern also reveals the sex, it was misused to find female fetuses and abort them (female foeticide); the ban on its use for sex determination prevents this (1 mark).

Answer: Testing fetal cells from amniotic fluid; banned for sex determination to check female foeticide.

Example 2: Why MTP is needed · 2 marks · Very short answerBoard level

State two situations in which MTP is advised and explain why MTP is safer in the first trimester.

Try it first, then show the solutionSolution

Situations: unwanted pregnancy due to contraceptive failure, unprotected coitus or rape; or when continuing the pregnancy could harm or endanger the mother, the fetus or both (1 mark).
Up to 12 weeks the fetus and placenta are small and the procedure is simpler with fewer complications; second-trimester MTPs are much riskier (1 mark).

Answer: Unwanted pregnancy or danger to mother/fetus; first trimester is relatively safe, second is much riskier.

Example 3: Turner fetus · 3 marks · Short answerHarder board level

A pregnant woman was advised MTP because the fetus developed from a zygote with 45 chromosomes and only one X chromosome. (a) Name the condition and the sex of the fetus. (b) Give two features the child would have. (c) Which legal ground justifies MTP here?

Try it first, then show the solutionSolution

(a) Turner's syndrome (45, XO); the fetus is female (1 mark).
(b) Sterile, with rudimentary ovaries and lack of secondary sexual characters (1 mark).
(c) Substantial risk that the child would be born with serious abnormality, judged by registered medical practitioners within the legal time limit (1 mark).

Answer: Turner's syndrome, female; sterile with rudimentary ovaries; ground of serious fetal abnormality.

Example 4: Reading the law · 2 marks · Very short answerHarder board level

Suppose a woman is 20 weeks pregnant and one doctor confirms a severe fetal abnormality. Can the MTP be performed? What if she were 9 weeks pregnant? Explain.

Try it first, then show the solutionSolution

At 20 weeks (between 12 and 24 weeks) the opinion of two registered medical practitioners is required, so one doctor's opinion is not enough (1 mark).
At 9 weeks (within 12 weeks), the opinion of one registered medical practitioner on a legal ground is sufficient (1 mark).

Answer: 20 weeks: needs two doctors; 9 weeks: one doctor suffices.

Example 5: Quacks and safety · 3 marks · Short answerHarder board level

Why are MTPs by unqualified persons a serious problem? Suggest two measures that can reduce them.

Try it first, then show the solutionSolution

Illegal MTPs by quacks are unsafe and can be fatal, causing maternal death and illness (1 mark).
Measure 1: counselling about avoiding unprotected coitus and the risks of illegal abortion (1 mark).
Measure 2: more health-care facilities so that legal MTP by qualified doctors is accessible, preferably in the first trimester (1 mark).

Answer: They endanger the mother's life; counselling and better health facilities reduce them.

Example 6: Two family histories · 3 marks · Short answerHOTS / competency

Suppose a couple in the second month of pregnancy has a family history of a chromosomal disorder on one side and a single-gene disorder on the other. (a) Which prenatal test can they consider and what will it examine? (b) If a severe disorder is found, what does the law allow at this stage? (c) Why is it important that the test is not used to find the baby's sex?

Try it first, then show the solutionSolution

(a) Amniocentesis: fetal cells in the amniotic fluid are examined for chromosomal pattern and genetic disorders (1 mark).
(b) Within 12 weeks, MTP is allowed on the opinion of one registered medical practitioner if there is a substantial risk of serious abnormality (1 mark).
(c) Sex determination followed by MTP of female fetuses is female foeticide; it is illegal and distorts the sex ratio (1 mark).

Answer: Amniocentesis; MTP with one doctor's opinion within 12 weeks; sex must not be determined (female foeticide).

Where students lose marks in MTP and Amniocentesis

The slips examiners see most often, and what to write instead.

Mistake: Defining amniocentesis as a sex-determination test
The misuse is better known than the use.
Wrong working
Amniocentesis is a test to find the sex of the fetus.
Right working
A prenatal test of fetal cells in amniotic fluid for chromosomal and genetic disorders; its misuse for sex determination is banned.
Do this: Define by its medical purpose, then mention the misuse.
Usually costs: 1 mark.
Mistake: Wrong time limits
Students mix up 12, 20 and 24 weeks.
Wrong working
MTP is allowed up to 12 weeks only.
Right working
Up to 12 weeks with one doctor; 12-24 weeks with two doctors, on legal grounds.
Do this: 12-24, 1-2.
Usually costs: 1 mark.
Mistake: Calling MTP a contraceptive method
Both reduce births.
Wrong working
MTP is a method of contraception.
Right working
MTP ends an existing pregnancy; contraception prevents pregnancy.
Do this: Contra-ception = against conception; MTP happens after conception.
Usually costs: 1 mark.
Mistake: Ignoring the ethical point
Students give only the procedure.
Wrong working
MTP is done to remove an unwanted fetus.
Right working
MTP is legal only on set grounds, to prevent misuse such as female foeticide, and is safest in the first trimester.
Do this: Add the legal-ethical line in every MTP answer.
Usually costs: 1 mark in 3-mark answers.

Exam tips

For 2-mark items, use the pattern: definition + reason (or advantage + disadvantage).
Quote the time limits and the number of doctors exactly.
Link karyotype cases to syndromes: 45, XO Turner; 47, +21 Down.
Write 'statutory ban on amniocentesis for sex determination', not just 'amniocentesis is banned': the test itself is legal for diagnosis.
Close social questions with a constructive measure: counselling, awareness, health facilities.

Practice questions on MTP and Amniocentesis

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

Q1 · 1 mark · MCQBoard level
MTP is considered relatively safe up to:
(a) 6 weeks (b) 12 weeks (c) 18 weeks (d) 24 weeks of pregnancy
Hint
First trimester.
Answer
(b) 12 weeks.
Q2 · 1 mark · Assertion-reasonHarder board level
Assertion (A): MTPs are considered relatively safe during the first trimester of pregnancy.
Reason (R): Second-trimester abortions are much riskier.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Hint
Does R explain A, or only contrast with it?
Answer
(b). Both are true NCERT statements, but R only contrasts the second trimester; it does not explain why the first trimester is safe.
Q3 · 2 marks · Very short answerBoard level
What is analysed in an amniocentesis sample? Name two genetic disorders it can detect.
Hint
Fetal cells and dissolved substances.
Answer
The fetal cells and dissolved substances in the amniotic fluid taken from around the developing fetus. It can detect disorders such as Down's syndrome, haemophilia and sickle-cell anaemia (any two), and helps judge the survivability of the fetus.
Q4 · 2 marks · Very short answerHarder board level
About 45-50 million MTPs occur worldwide each year, about one-fifth of all pregnancies conceived. Estimate the number of pregnancies conceived each year, and explain why the high number of MTPs points to a gap in contraceptive use.
Hint
Multiply by 5.
Answer
Total ≈ 5 × 45-50 million = 225-250 million pregnancies a year. Many MTPs end unwanted pregnancies caused by unprotected coitus or contraceptive failure, so better awareness and use of reliable contraceptives would reduce the need for MTP.
Q5 · 3 marks · Short answerHOTS / competency
Suppose a district finds that the number of girls born per 1000 boys has fallen sharply over ten years even though births have stayed steady. Using your knowledge of amniocentesis and MTP, give the most likely reason, and suggest two actions the authorities should take.
Hint
Misuse of a prenatal test.
Answer
Likely reason: illegal sex determination by amniocentesis followed by MTP of female fetuses (female foeticide). Actions: strictly enforce the statutory ban on prenatal sex determination (check clinics and labs); run awareness and counselling programmes on the law, the equal value of daughters and the risks of illegal MTP; ensure MTPs happen only on legal grounds by registered practitioners.
Q6 · 4 marks · Case-basedHarder board level
Read and answer.
Suppose a 17-year-old school student becomes pregnant after a contraceptive failed. She is 8 weeks pregnant and is afraid to tell her family; a friend suggests a local untrained person who 'does it cheaply'.
(a) Is MTP lawful in her case at 8 weeks? Under what condition? (1)
(b) Why should she avoid the untrained person? (1)
(c) What two kinds of support do the reproductive health programmes recommend for such cases? (2)
Hint
Within 12 weeks; quacks; counselling and facilities.
Answer
(a) Yes, within 12 weeks on the opinion of one registered medical practitioner that continuing the pregnancy would risk grave injury to her physical or mental health. (b) MTPs by unqualified persons are unsafe and can be fatal. (c) Counselling (on avoiding unprotected coitus and on the risks of illegal abortion) and access to proper health-care facilities with qualified doctors; also correct information on contraception.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1.What is MTP?Show answer
Intentional or voluntary termination of pregnancy before full term.
2.In which year did India legalise MTP?Show answer
1971.
3.How many doctors' opinions are needed for MTP between 12 and 24 weeks?Show answer
Two registered medical practitioners.
4.What does amniocentesis examine?Show answer
The chromosomal pattern of fetal cells in the amniotic fluid.
5.Why is amniocentesis for sex determination banned?Show answer
To prevent female foeticide.
6.Karyotype 45, XO indicates?Show answer
Turner's syndrome.

MTP and Amniocentesis: frequently asked questions

Is MTP legal in India?

Yes, on set grounds: within 12 weeks on one registered doctor's opinion, and between 12 and 24 weeks on two doctors' opinion, if the pregnancy risks the woman's life or health or the child would be seriously handicapped.

Why is MTP safer in the first trimester?

Up to 12 weeks the procedure is simpler with fewer complications; second-trimester abortions are much riskier.

What is amniocentesis used for?

To detect chromosomal and genetic disorders of the fetus by studying fetal cells in the amniotic fluid.

Why is there a ban on amniocentesis?

The ban is on its use for sex determination, because finding the sex and aborting female fetuses (female foeticide) is illegal and harmful to society.

Why are illegal MTPs dangerous?

They are often done by unqualified persons, which is unsafe and can be fatal for the mother.