miscarriage is a very
Given time for your body to recover and you (and your partner’s) age is not against you, your next pregnancy will normally go well (see ‘Subsequent Pregnancies’) as the stats are little different from a first loss. You may find you are more vigilant and aware of what could cause problems for the next pregnancy, but that is no bad thing, unless it becomes obsessive. It is only self-protection if we do not feel the same joy of this new life as we did with our first pregnancy. We say, ‘our innocence was lost.’ Check ‘Recurrent Miscarriages’ if you experience further losses.
Although they are not talked about much, the majority of miscarriages are often the first pregnancy and usually in the first trimester (up to 14 weeks), and are caused by a genetic problem with that particular foetus and are due to nothing more than unfortunate bad luck and therefore are unlikely to reoccur. The generally accepted figures are that between 15% - 25% of pregnancies end in miscarriage. From our own experience we suggest 1 in 4. However, that figure could be higher according to the English Professor, Sir Robert Winston, if unreported miscarriages are included. These would usually be ones that occur at home with no obvious adverse physical after affects (we assume help from a medical professional would be requested if there was and recorded by them) or was a very early miscarriage and only recognised when the pregnancy had been previously confirmed with a home test kit. Without the test these pregnancies are often not identified by women as they can just be seen as late, heavy periods. They are called ‘Chemical Pregnancies’. It is always advisable to have a check-up after any miscarriage, even belatedly, as a low grade infection can possibly affect future pregnancies.
second trimester miscarriages;
The reasons for these can be different from first trimester miscarriages and you may even find out what that reason is, although not necessarily, even sometimes after tests are done. However if you do and it is something repairable or treatable, this knowledge can work for you in a subsequent pregnancy.
possible reasons for miscarriage;
The following possible reasons are a collation of internet findings from medical sites recognised for their status and integrity. Several apply to recurrent miscarriage only. Some causes are generally accepted and others are still in the research stages. They have been edited by a medical professional.
- Chromosomal Abnormalities; this is a non-viable
pregnancy and the most common reason given for all miscarriages (50% to 70% quoted)
and are also usually first time pregnancies. There is/was nothing
that could have been done to save your baby. Nothing you did
or didn’t do, like bending, stretching, carrying a heavy weight,
walking, swimming, usual daily activities or having sex would have
made any difference, otherwise there would be many more miscarriages. (Moderate
exercise is always encouraged during pregnancy.) A
baby’s remains can be tested even if the miscarriage happened
at home although persistence may be required with medical professionals. If
post mortem tests are carried out, usually with recurrent miscarriage,
they can reveal the sex of the baby but perhaps no cause. This may
not mean there is no problem. It might just be that one
cannot be detected with the current medical knowledge.
- The chromosomes are tiny thread-like structures
found in the nucleus of a cell. There are 46 chromosomes arranged
into 23 pairs, one chromosome per pair coming from the father and
the mother and each carries hundreds to thousands of genes which
are the basic units of heredity and are responsible for growth and
development, determining all of a person’s
physical attributes, such as sex, hair, eye colour and blood type
to the workings of internal organs. At
conception, a cross-over of genes takes place with half of them coming
from the father’s sperm and the other from the mother’s
ovulating egg. This forms a baby. At this critical time the
cell may split unevenly and information, lost by chance, will lead
to a miscarriage.
The information may not be required for many weeks so a pregnancy can appear normal initially until the missing piece is needed, then, with-out it; inevitably a baby dies and miscarries. Abnormalities involving a missing or extra chromosome are not caused by an exposure during pregnancy. Random chromosomal abnormalities are unlikely to reoccur and are not the result of either parent’s health problems. Once a pregnancy is affected by a chromosome abnormality though, there is however a slightly greater chance for future pregnancies to be affected also. In some cases prenatal diagnosis are offered for future pregnancies such as chorionic villus sampling (CVS) or amniocentesis.
- Inherited Chromosomal Rearrangements;
only 5% of couples have these chromosomal abnormalities which are
passed on to their babies and they can come from either parent. They can cause a wide range
of defects. When recurrent miscarriages occur there is approximately
a 2-4% chance that a baby has inherited an extra chromosome or is
missing a piece of one, but healthy children can still be conceived
in the future. Chromosome
studies can be performed on parents’ blood to see if either
is a carrier of a chromosomal re-arrangement. Parents themselves
should have no health problems because, although their chromosomes
are rearranged, they are balanced and there are no missing or extra
pieces of the chromosomes.
- Gene Mutation; another genetic cause
is a change (mutation) in a single gene (or several genes) on the
chromosomes. This can cause specific genetic diseases or birth
defects. Mutations can occur
spontaneously or can be inherited from parents who themselves are
healthy. Nature often detects a baby’s incompatibility
to life and the foetus is passed naturally. It is a good idea
to let your LMC (Lead Maternity Carer) know early on about any current
or historical family members with genetic problems. A geneticist
could be consulted.
- Egg implantation; the fertilised egg
may implant outside the uterus (womb - most often within a fallopian
tube) resulting in an Ectopic pregnancy. This is a life-threatening
situation that is often agonising and distressing.
- The placenta (afterbirth); could be imperfect and not functioning properly contributing to a poorly nourished and underweight baby.
- May be sick or under too much stress, the effect depending on to
what degree with each individual woman
- may have serious morning sickness (hypermesis
gravidarum) which causes dehydration requiring medical attention
(see 'Things we may not know' & 'Morning Sickness')
- May still have an intrauterine contraceptive
device (IUCD) inside the uterus and 99.9% will cause the contents
of the uterus to abort
- May have suffered serious stress or injury
and although even a hard blow to the stomach is survivable, it
can cause placental abruption and loss of baby. Injuries to other
parts of the body may cause other problems affecting the baby’s
- May have hormone problems within her reproductive system like Luteal
Phase Defect - hormone imbalance with menstrual phases out of kilter.
PCOS may also contribute to miscarriage.
- May have gluten intolerance (blood test diagnosis) which has very
specific symptoms which a GP and nutritionist can control with diet
when diagnosed (Coeliac Disease)
- May have ‘NK' (Natural Killer) Cells.
These are the ones responsible for protecting us from bacteria, viruses
and foreign bodies, and organ transplants rejections. The developing
baby contains foreign genetic material coming from the father, but
in normal circumstances it is not rejected. However, in some women
these NK cells may do so and cause a miscarriage either by being
high in numbers or by abnormal hostile activity. Like most auto-immune
disorders this problem can switch on and off, so some of the women
may have 1 or more normal pregnancies as well as recurrent miscarriages.
Women with CD16/56 NK cells in excess of 12% or 0.2 absolute number
are at risk but the current research is very hopeful.
May have a physical defect like uterine malformation (one in 6 to 10 women) or Cervical Incompetence which only affects pregnancies beyond 14 weeks gestation. The insertion of a cervical stitch (cerclage procedure) is often recommended and some doctors will also prescribe bed rest. The stitch requires removal 3 weeks before due date. There is no reliable method to pre-diagnose this condition which can be the result of a congenital weakness in the cervix, cervical trauma (such as from D&C procedures), multiple births or other complications during labour or delivery. The end result is the same - the cervix opens before it should.
- May have small fibroids usually after a previous caesarean operation
- May have adhesions inside the womb cavity
(Asherman's Syndrome) that can be associated with miscarriage possibly
by restricting the implantation and growth of the foetus, as well
as causing infertility.
- May have low blood levels of the immune system
protein, macrophage inhibitory cytokine 1 (MIC 1), which often shows
up to 3 weeks before a miscarriage and affects foetal viability in
early pregnancy, suggesting possible predictive and causative roles.
- May have abnormal blood flow to the uterus,
usually pre-eclampsia or cholestasis; This occurs when one or both
uterine arteries restrict the flow of oxygen and vital nutrients
to the placenta, compromising the growth of the baby.
- May have Rhesus negative blood type: RH - or RH + problems leading to antibodies being formed which can also affect subsequent pregnancies. Anti-D lg must be given with-in 72 hours if the woman is Rhesus negative and has suffered a miscarriage, had an abortion, an Ectopic pregnancy or a stillbirth. Anti-D lg should also be given at birth if the baby is Rhesus positive.
May have a family history of reproductive problems. This is usually connected with previous multiple losses and/or later, LLETZ treatment for CIN (basically, abnormal cells in the cervix) 09.09 see http://www.colposcopy.co.uk/treatment.htm
Scientists have identified that the gene NOS3 appears to trigger repeated unexplained miscarriages in some women. People with a gene mutation in the enzyme MTHFR (methylenetetrahydrofolate reductase), involved in amino acid metabolism in the body, can decrease the ability to metabolize folic acid and other B vitamins.
(There is ongoing speculation around both the latter entries so you may wish to research the latest information yourselves.)
- Endometriosis; this can double the chances of
miscarriage as it creates a hostile environment for the baby to grow in...
treatment can be helpful.
- Hypothyroidism; this has now been connected to late miscarriage but if
known about or tested for it can be dealt with. Personal history and shared
care with an obstetrician is advisable (Thyroxine).
- Diabetes; this devastating disease also causes
abnormalities in the babies development. It can be treated with the
anti-diabetes drug 'Metformin' which appears to reduce the likelihood of
- ‘Celiac Disease; Quote from the following website which has more information
http://www.greenmedinfo.com/article/recurrent-miscarriages-may-occur-due-undiagnosed-celiac-disease-and-may. Available literature data shows that celiac disease (CD) is a frequent cause of recurrent miscarriage. However, data is lacking for pregnancy outcomes when the patient is on a gluten-free diet (GFD). A case-control study about the effect of GFD on pregnancy was conducted from 1995 to 2006. A cohort of 13 women (mean age 32 years, range 22-38 years) affected by CD with recurrent miscarriages was observed. In all of them several causes of miscarriage (gynecological, endocrine, hematological, etc.) were excluded. All patients were started on a gluten-free diet and were reassessed throughout a long-term follow-up period to evaluate the outcome of pregnancy.’
- Kidney & congenital heart (obstetric high
risk), Colitis (Auto-immune disease where a severe bout can starve baby
or body not cope with both), bacterial vaginosis (can cause late miscarriage),
Scleroderma (a soft tissue disease) skin and joint diseases.
- Thrombophilic/Blood Clotting Disorders which should have already been picked
up or found in the first round of ante-natal blood tests; 'Anti phospholipid
Syndrome' (or Hughes Syndrome), Lupus, PAPS Syndrome which are related to
repeat miscarriages. Treatment with Aspirin, Clexane or Heparin works in
many cases. Subsequent pregnancies may not have disorders, hence auto-immune
response to pregnancy, however midwife and obstetric care are recommended
- Any severe infection such as rubella, cytomegalovirus,
syphilis, mycoplasma, toxoplasmosis, gonorrhoea, Chlamydia, malaria or
Listeria contracted from certain foods (see your LMC for updated info.) The
baby is rarely carried to full term when it is then likely to be severely
- May have a uterine infection, bacterial vaginosis (this showed in one study that women with this infection were 9 times more likely to miscarry than uninfected women) certain viruses like ‘slapped cheek’ or ‘Fifth disease’ infection. (This last is best diagnosed early and will need Anti-biotics in labour if baby carried to full term.)
- Career - there is anecdotal evidence that women
air hostesses, dental nurses, veterinarians and those doing continuous
heavy lifting are at greater risk. Tiredness and excessive work hours (e.g.
60 hours per week) and continual
nightshifts can lead to an unhealthy lifestyle stopping the body from being
- Having multiple D&C’s (Dilation & Curettage)
- Using spas and saunas or exercising excessively causing
undesirable high temperatures
- Using pain relieving medication such as non-steroidal anti-inflammatory
drugs like ibuprofen and aspirin may increase risk around the time of conception
and are also blood thinning agents
- Unhealthy lifestyles like a poor diet
- Science Daily (Dec. 4, 2006); Women who have a low body mass index before they become pregnant are 72% more likely to suffer a miscarriage in the first three months of pregnancy, but can reduce their risk significantly by taking supplements and eating fresh fruit and vegetables, according to study findings published online today.
- Comments from the Recurrent Miscarriage Clinic, Sheffield Hospital, UK. (07.09); ‘Being clinically obese or underweight has a small but significant increased risk of miscarriage in subsequent pregnancies.’
This is the 2013 ‘Guideline of things to avoid during pregnancy’ especially relating to miscarriage. They have changed over the years, particularly with alcohol and food, some foods now acceptable and others to avoid added. (Checking out with your medical professional for any updates is advisable)
Things to avoid during pregnancy;
- Food; Soft cheese (except in small quantities and eaten directly and immediately from manufacturer’s wrapping – do not reseal & eat), salads and sandwiches (unless prepared at home), aioli, raw eggs, cold cooked or smoked chicken, rare meat, pate, liver, hummus, sushi, deli food, custard, cream, soft serve ice-cream, yogurt more than 2 days old, ice, water (if travelling overseas), and energy drinks. Chocolate – keep to a minimum to help guard against unnecessary weight gain as well.
Seafood; any raw seafood, Bluff and Pacific oysters, blue fish tuna & marlin (more than once a week),
many kinds of fish, including snapper, more than 3 or 4 times a week. (NZ Herald 28.07.13)
- Caffeine; The British Medical Journal linked
caffeine to an increase of restricted foetal growth and the British Food
Standards Agency added the risk of miscarriage. They rank caffeine with
alcohol in its potential to harm unborn children. Pregnant women are being
advised to cut their coffee intake to 2 mugs per day and are warned against ‘energy’ and ‘smart
drinks’ (including soft drinks - American FDA - check information on
bottles) saying that these contained other ingredients beside caffeine which
are not recommended for pregnant women. Ordinary tea contains caffeine
as well. It also warns to be ‘cautious’ about herbal teas. Abstaining
is a good option, especially if a miscarriage has already been experienced.
- Dehydration; in general the more water that is drunk
is beneficial anyway (as opposed to other sorts of drinks) so being aware
of your intake per day is helpful for avoiding miscarriage as it seems to
be accepted by medical research that lack of water is a contributor to it.
The amount to drink varies according to what website you access however at
least 8 glasses sounds reasonable. When taking the baby’s needs, morning
sickness, hot weather and exercise into account, you may wish to drink more.
(Excessive thirst can be an indication of diabetes or a more serious condition).
- Alcohol; Using it can cause Fetal Alcohol Syndrome, IVGR. Most medical recommendations are to drink none at all.
- Drugs; Possible miscarriage is linked to certain prescription drugs especially those used to treat acne (e.g. Accutane), malaria and cancer as they alter the blood structure. Exposure to DES (diethylstilbestrol) in the womb and foetal exposure to DES has also been associated with a weak cervix. Check out with your doctor any over-the-counter drugs for suspected adverse effects before taking during pregnancy. Using recreational drugs any time may affect your baby and this applies to both partners pre-pregnancy.
- Environmental pollution e.g. exposure to noxious or
toxic substances like; anaesthetic gases, dry cleaning fluids, all solvents,
petroleum products, arsenic, oxide, lead, mercury (source may be amalgam
dental fillings), formaldehyde, Roundup, radiation and chemical by-products
in tap water, trihalomethanes can all cause fetal abnormality as well as
miscarriage (both partners). Concern around BPA being linked to health risks
like breast cancer and miscarriages, amongst other things, may have no proven
foundation but it would be circumspect to err on the side of caution. In
July 2005, New Zealand TV One News had an item about miscarriage regarding
women living near an electro magnetic field (EMF). It stated that 80% of
them would miscarry. This conclusion is seen as controversial on many internet
sites. The UK National Radiology Protection Board says that miscarriage could
affect 5% to 10% of women.
- Research shows that when a body is exposed to
environmental pollution it can damage the sperm. The latest research is
that up to 50% of miscarriages maybe a result of the state of the father’s
sperm. (Other research done in India and reported in News Post India and
Google in June about male partners of women who appeared healthy but were
recurrent miscarriers, showed an enzyme at the top of the sperm was defective
affecting 80% of sperm, a statistic that the researchers found to be startling
and others to query. They blamed environmental pollution. There is also
a book called ‘Our Stolen
Future’ that is interesting.) Sometimes
DNA in sperm that initially tests normal can fragment later. This is caused
by free radical damage for ‘Environmental and consumption’ reasons.
Internet sources suggest possible treatment using antioxidants and 1gm of
Vit. C and 1 gm of Vit. E for 2 months can reduce the incidence of sperm
DNA fragmentation markedly and avoid re-current miscarriages.
- Genetic abnormalities and repeat miscarriages can be chromosomal disorders.
The exact cause can possibly be determined with a geneticist referral and
the use of blood tests (karyotype) to study the sperm.
- The effects of different things on men’s sperm production is being
researched and a couple are;
a) a good diet can make a big difference in the amount of sperm produced, when there was a low sperm count, the better the diet the more produced. b) working with a lap-top on a lap rather than on a table, could mean that the genital area is affected by the higher temperature, which can lower the amount of sperm produced. The electrical transference can interfere with the body cell development.
Recent statistics in NZ give the average age of
first time mothers as late as 30 years of age (35 in the USA) which adds
to a higher baby loss rate. Miscarriages
increase after 27 years of age, slowly at first, gaining momentum after 35
up to 25%, but even then, the chances of having a child are still reasonable.
Once past 40 years of age however, the statistics progress to 33% and over
45 to when at least 50% of pregnancies miscarry. It is still possible
however and happens, although the successful birth of babies to older high
profile women in the news, can often be after IVF treatment is sort, (‘in
vitro fertilisation’ the outcome commonly known as a ‘test tube
baby’) or a miscarriage, which we don’t necessarily hear about.
The reason is that the closer to menopause and the eggs expiry date, the poorer the quality and the more chromosomal abnormalities possible. (Chromosomes are tiny structures inside the cells of the body which carry many genes. Genes determine all of a person’s physical attributes, such as sex, hair, eye colour and blood type.) The incidence of ‘Down Syndrome’ (or any other syndrome) is also more likely to occur in women over 30 years of age with the higher risk of multiple miscarriages. If the pregnancy is the result of IVF, then it is possible for the zygote (from the newly combined egg and sperm) to be tested prior to implantation. This is called the FISH test. Women with a history of problem pregnancies may request IVF. These pregnancies can progress normally and the care will be no different than that of a woman who has conceived naturally.
The physiology for women is: 3 months before women are born they have the maximum number of eggs, around 2 million. At puberty, about 300,000 but by 37 years of age of there are only 30,000, and by menopause around 1,000 eggs left.
Recent research suggests male age can also be a miscarriage factor as it is in women. In general, researchers found that miscarriage risk steadily inched upward as men grew older, doubling between the ages of 20 and 50.