Ultrasound imaging, also called ultrasound scanning, is a method of obtaining pictures from inside the human body through the use of high frequency sound waves. Obstetric ultrasound refers to the specialised use of this technique to produce a picture of your unborn baby while it is inside your uterus (womb). The sound waves are emitted from a hand-held nozzle, which is placed on your stomach, and reflection of these sound waves is displayed as a picture of the moving foetus (unborn baby) on a monitor screen. No x-rays are involved in ultrasound imaging. Measurements of the image of the foetus help in the assessment of its size and growth as well as confirming the due date of delivery.

Toxaemia of pregnancy or pre-eclampsia is a condition that occurs in some women during the second half of pregnancy. It is characterised by high blood pressure, swelling that doesn't go away and large amounts of protein in the urine. If left untreated it can stop the placenta, which provides nourishment to the baby, from getting enough blood and thus slows the baby’s growth. The condition can also be dangerous for the mother. In the early stages, simple measures such as bed rest may control the symptoms but, if not, it may be necessary to deliver the baby a week or two early.

Gestation is the length of a pregnancy from conception to birth (usually 40 weeks in humans). Gestational diabetes is a type of diabetes (glucose intolerance) that occurs in some women during pregnancy. Women with gestational diabetes have a high level of glucose (or sugar) in their blood because they do not have enough of the hormone insulin to cope with the extra demands of the growing foetus (unborn baby). In most cases, gestational diabetes is managed by diet and exercise and will usually disappear after the baby is born.

In a very small number of pregnancies, the baby may not grow as well as in a normal pregnancy. This is called intrauterine growth restriction (IUGR) and the unborn baby will be described as being “small for gestational age” (SGA). This means that the baby is smaller than expected for the length of time that the woman has been pregnant. An unborn baby with IUGR should be carefully managed during pregnancy and delivery but will usually be healthy at birth.

An epidural is a type of anaesthetic (medication that stops pain and feeling) that makes your lower body numb without putting you to sleep. It is often used during labour and delivery so that the woman can remain awake but not experience the pain of the birth. The anaesthetic medicine is injected into the epidural space (the area surrounding the spinal cord) in the lower back by an anaesthetist (a doctor specialised in giving anaesthetics). The area of skin where the injection goes in will be made numb first. Although all of the lower body becomes numb, you can still push during contractions. After the delivery you will need to remain in bed until the anaesthetic has worn off. This usually takes about two to four hours. An epidural anaesthetic can be used for a vaginal or caesarean delivery.

Induction of labour is the process of starting labour artificially. This may be needed for many reasons, such as high blood pressure, toxaemia or if your waters have broken and you haven’t gone into labour by yourself. There are a few different methods that may help to induce labour, including an internal examination by the midwife or doctor, medication that softens the cervix (entrance to the uterus) allowing it to open, or other medicine that stimulates the uterus (womb) to contract.

A caesarean section is the name of the operation done to deliver a baby through a cut in your stomach and uterus (womb). In some cases this is safer than a vaginal delivery. The surgery is performed by an obstetrician and it usually only takes a few minutes for the baby to be born. A general or epidural anaesthetic can be used. Most women will be up and about within 24 hours of the surgery.

A foetus is the name given to an unborn baby after the eighth week of pregnancy until birth. Foetal distress is a very general term that is used to describe any unborn baby that is showing signs of agitation, usually during labour and delivery. Signs of distress are usually diagnosed by changes in the speed of the unborn baby’s heartbeat and/or a decrease in the oxygen levels of the baby’s blood.

A premature baby is one that is born before 37 weeks’ gestation (the length of a pregnancy from conception to birth). The normal period of gestation in humans is 40 weeks. If your baby is premature, it may need to be cared for in a specialised unit, called a neonatal unit, until his or her internal systems are more fully developed. The length of time your baby will stay in the neonatal unit will generally depend on how early it was born.

The postpartum (also called postnatal) period is the time after the birth of a baby. During this time many women will experience a feeling of slight sadness or anxiety. This is called the “baby blues”, and in some women it may develop into postpartum depression. The baby blues happen in the days just after the birth and usually only last for about a day or up to a week. Postpartum depression can occur days or months after the baby’s birth and the feelings of sadness are worse than with the blues.

About one in every six couples in New Zealand will experience infertility. This is when they are unable to conceive a baby after one year of trying, or when the woman has been unable to carry a pregnancy to a live birth. In about half of the cases, the cause of infertility is due to a problem with the woman and, in the other half, the problem will be with the man. There are now many treatments available for infertile couples and, in many cases, these treatments will result in a successful pregnancy. Doctors with a special interest and expertise in this area will usually provide the best opportunity for treatment. Local support groups and societies can be of help during the stressful time of having tests and treatment.

The endometrium is the name of the tissue that lines your uterus (womb). Endometriosis is a condition where tissue, like the endometrium, grows in other parts of the body. Usually these growths occur inside the pelvic cavity in places such as the ovaries, bowel, or a lining of the pelvic cavity and abdomen called the peritoneum. Each month, as the endometrial lining of the uterus builds up with blood that will be lost during your period, these other growths of endometrial tissue get bigger and can bleed and cause inflammation and adhesions (internal scarring). Some women with this condition do not have many symptoms, whereas others suffer severe pain and problems such as infertility and tiredness. Treatment includes medication that will help control the pain and inflammation, and some women may need surgery to remove the tissue growths.

Fibroids are noncancerous growths or tumours on the muscular part of the uterus (womb); sometimes they are also called myomas. Fibroids may be very small (about 5mm) or can grow to be quite large (about 100mm). Many women with fibroids do not notice any symptoms and will not need treatment, whereas others may experience problems such as painful and heavy periods. Treatment includes medication to shrink the fibroids and, in some women, surgical removal.

An ovarian cyst is a fluid-filled sac or pouch in the ovary. In most cases, the cyst grows as a result of ovulation (when the egg is released from the ovary), and it will usually shrink over time. Sometimes, the ovarian cyst may cause pain. The best way to check for an ovarian cyst is by ultrasound examination, and the treatment will depend on how troublesome the symptoms are. Sometimes it is best to leave the cyst alone and just check it regularly with ultrasound. In other cases it may need to be removed by laparoscopic surgery.

Polycystic ovarian syndrome (PCOS) is a hormonal disorder that can cause you to have a variety of symptoms, including no periods or irregular periods, increased hair growth on the face and body, acne (pimples) and increased bodyweight. PCOS is also one of the main causes of infertility in women. The ovaries of women with PCOS often contain many small cysts (fluid-filled sacs), but this does not seem to be the cause of the condition. For women who have not reached menopause, the most common treatment is the birth control pill, which will regulate your periods. There are also other medicines that can help control the symptoms.

Menstruation is the medical name for your monthly period. This is when blood and tissue from the lining of the uterus (womb) is shed through the vagina and out of the body. Menstruation starts at puberty and it is stimulated by hormones that make a girl’s body able to become pregnant. This usually happens anytime between the ages of 9 and 16 years. Menstruation will recur about every 28 days (the menstrual cycle), unless interrupted by pregnancy, and will stop at menopause, which occurs at about 50 years of age. There are a number of problems that can occur with menstruation ranging from mild to severe. More than half of all women will have cramps (dysmenorrhoea) during the first day or two of their period. Other problems include very heavy or long periods (menorrhagia) or no periods (amenorrhoea).

The endometrium is the lining of your uterus (womb). Endometrial ablation is the surgical removal or destruction of this lining. There are different methods of destroying the endometrium including electricity, laser therapy or freezing. A specialist performs the operation and it is done through the vagina, so there is no need for the abdomen to be cut open. The endometrium will heal leaving scarring, which usually reduces or stops menstrual periods. In women who have very heavy periods (menorrhagia), an endometrial ablation can be done instead of a hysterectomy as it is an easier procedure than a hysterectomy and is quicker to recover from. Endometrial ablation is only performed in women who no longer wish to have children.

Many women experience feelings of tension, anger, fatigue and depression just before and during the first days of their menstrual period. This is called premenstrual syndrome (PMS) and is probably caused by the change in hormone levels. In most women with PMS, symptoms will not be severe enough to require treatment, but some will need to discuss their symptoms with a doctor. Sometimes symptoms can be improved by avoiding some types of food, such as coffee and foods high in salt.

Cervical dysplasia is the growth of abnormal cells around the cervix (entrance to the uterus). Although this condition is not cancer there is a small risk that these cells could become cancerous. Sometimes no treatment is needed as the condition may improve by itself. For more severe dysplasia, treatment involves removing the abnormal cells by freezing, laser therapy (a tiny beam of light) or electrical burning. Whether you have treatment or not, you should have more frequent Pap smears in the future.

A Pap smear is a test to check for signs of cancer on the cervix (entrance to the uterus). A doctor will put an instrument called a speculum into the vagina to open it, and then gently wipe or brush a few cells from the cervix to send to the laboratory for testing. A Pap smear can show if cervical cells are going through any changes that happen before cancer grows. It will also show if cancer cells are present. Regular Pap smears make it possible to prevent cancer before it grows, or to pick up the cancer early so that it is more easily cured. A National Cervical Screening Programme aims to provide all New Zealand women with regular smears and recommends that a Pap smear be done every three years between the ages of 20 and 70 years.

A colposcopy is a detailed examination of the cervix (entrance to the uterus) with a specially lit microscope (colposcope). As with a Pap smear, an instrument called a speculum is inserted into the vagina, and then the colposcope is positioned outside the vagina with its light directed on the cervix. A specialist will perform a colposcopy if your Pap smear has shown abnormal or cancerous cells on the cervix. During the colposcopy further samples of tissue (biopsies) are usually removed and examined in the laboratory so the doctor can get a clearer idea of the extent of the abnormal cells.

The most common vaginal infections are yeast infections (also called candidiasis or thrush), trichomoniasis, or bacterial infections (also called bacterial vaginosis). Symptoms of an infection may include irritation, itching, discharge and odour. To make a diagnosis a doctor will usually do a vaginal swab, which involves wiping a type of cotton bud gently across the infected area. The swab is then sent to the laboratory for analysis. There are many medicines that can successfully treat these infections.

Menopause is also called the “change of life” and is the time when your periods will become irregular and stop. This is a natural process in all women and for most it will occur between the ages of 45 and 55 years. Menopause is brought on by decreasing levels of the hormone oestrogen and this can cause a variety of symptoms, including hot flushes, night sweats, mood swings, sleeping problems, memory problems, depression and vaginal dryness. Some women do not notice any symptoms or they are very mild, whereas others experience more severe problems and should go to their doctor for advice. There are many treatments available to reduce the symptoms associated with menopause and, in some cases, lifestyle changes can also help.

Hormone replacement therapy (HRT) is when female hormones (oestrogen by itself or with progesterone) are given to a woman during or after menopause when the production of oestrogen by the ovaries declines. The hormones can be taken as tablets, implants or skin patches. HRT has become less popular in recent years because a large study in the USA found that long-term use of HRT can increase the risk of some serious diseases, such as breast cancer and blood clots. However, for some women, short-term use of HRT (no more than 3–4 years) can provide relief from symptoms caused by having less oestrogen in their bodies, such as hot flushes and loss of bone density. The risks and benefits of HRT should be thoroughly discussed with a doctor before treatment begins.

A person with urinary incontinence is unable to control the release of urine from their bladder. This may be an occasional leakage or a complete inability to hold on to their urine. Women experience incontinence more often than men, and this may result from muscle damage during pregnancy and childbirth or the changes associated with menopause. The most common type of urinary incontinence in women is stress incontinence. This is when urine leaks out when movements, such as coughing, laughing or sneezing put pressure on the bladder. The treatment of urinary incontinence will depend on the cause of the problem, but may include exercises, medication or surgery.

If the uterus (womb) or bladder slips out of position, this is referred to as a prolapse. It is caused when the supporting muscles become weak, allowing a part of the uterus or bladder to bulge into the vagina. The most common reason that these muscles become weak is childbirth, and a uterine prolapse or bladder prolapse (also called cystocoele) is more common in women who have had a lot of babies. Symptoms include pain, heaviness in the vaginal area and a frequent need to pass urine. In mild cases, exercises may help improve the symptoms, but women with more severe prolapses may need to have surgery.

A hysterectomy is an operation to remove your uterus (womb). Some types of hysterectomies include the removal of other organs as well, and this will depend on the reason for the operation. A hysterectomy is a treatment for many different diseases and conditions and it can be done through the vagina or through a cut in the abdomen.

An oophorectomy is an operation to remove one or both ovaries. It is done for many reasons including ovarian cancer, ovarian cysts or to remove the source of the hormone oestrogen that is produced by the ovaries and can stimulate some cancers. If both ovaries are removed, your periods will stop and you will not be able to have children. Sometimes an oophorectomy is done together with a hysterectomy.

This is an operation where the cervix (entrance to the uterus) is dilated and a hysteroscope (small lighted mini telescope) is inserted into the uterus through the vagina and cervix so the specialist can see the inside of the uterus. If no cancer is present, a small spoon-like instrument with a long handle, called a curette, is inserted and the lining of the uterus is scraped off and sent to the laboratory for examination. This procedure can be done under a general (you are asleep) or local (you are awake but the area being investigated is numb) anaesthetic.