pregnancy CT scan preparation

Overview

A CT scan (computed tomography) is a test that uses X-rays to take detailed pictures of the inside of your body. During pregnancy, your doctor may recommend a CT scan if they think you have a serious health problem that needs quick diagnosis, such as a blood clot in the lung, appendicitis, or a major injury. The scan is generally safe for you and your baby when it is done for a clear medical reason. The radiology team will take special steps, like shielding your belly, to keep radiation away from your baby as much as possible.

CT scans are not routine during pregnancy, but they are sometimes needed in emergency situations. Your doctor will carefully explain why the test is necessary and how they will protect you and your baby.

This affects pregnant women who have symptoms that could indicate a serious condition, such as severe abdominal pain, chest pain, shortness of breath, or after an accident. The decision to perform a CT scan during pregnancy is always made on an individual basis.

Symptoms

Common symptoms

• Sudden or severe pain in the belly or chest
• Shortness of breath or trouble breathing
• Swelling or pain in one leg, which can be a sign of a blood clot
• Heavy bleeding from the vagina
• A severe injury, such as from a car crash or fall

Causes

Main causes

• Suspected blood clot in the lungs (pulmonary embolism)
• Appendicitis (inflammation of the appendix)
• Kidney stones or blockages in the urinary tract
• Serious injury from an accident or fall
• Bleeding in the abdomen or pelvis

Risk factors

• Pregnancy itself increases the risk of blood clots.
• Having had a previous blood clot or a family history of blood clots.
• Older age or obesity.
• Certain medical conditions, such as inflammatory bowel disease or kidney disease.

When to see a doctor

See a doctor urgently if:

• If you experience any emergency symptoms listed above, call your local emergency number immediately.
• If you have been told to book a CT scan and you develop new or worsening symptoms, contact your maternity unit or doctor the same day.

Book a routine appointment if:

• If you have questions about the CT scan, radiation exposure, or how it may affect your baby, talk to your doctor or midwife.
• If you are breastfeeding and the scan will use contrast dye, ask the radiology team about any precautions.

Diagnosis

Diagnosis starts with your doctor taking a detailed history, examining you, and performing basic tests like blood pressure and laboratory blood tests. If these suggest a serious condition that needs a detailed image, your doctor may order a CT scan. In pregnancy, the radiology team will adjust the scan settings to use the lowest possible radiation dose and may cover your belly with a lead shield.

Tests that may be done

• Physical examination and vital signs, such as heart rate, blood pressure, and oxygen level.
• Blood tests to check for signs of infection, anemia, or blood clotting.
• Ultrasound, which is often used first during pregnancy because it uses sound waves instead of radiation.
• CT scan with or without contrast dye, as recommended by your doctor.

What to expect at your appointment

You will lie on a motorized bed that slides into the CT scanner, which looks like a large doughnut. The scan is painless and usually takes only a few minutes. You may hear buzzing or whirring noises. If contrast dye is used, it may be given through an intravenous line (IV) in your arm. Tell the technologist if you feel dizzy, short of breath, or have any unusual sensations during the scan.

Treatment

The treatment after a CT scan depends on what the scan shows. The scan helps your doctor identify the problem quickly so they can provide the right care. In pregnancy, treatments are chosen to be safe for both you and your baby as much as possible.

Self-care at home

• Follow any instructions about eating and drinking before the scan, especially if contrast is planned.
• Wear comfortable clothing with no metal zippers or buttons.
• Leave jewelry, watches, and hairpins at home or remove them before the scan.
• Tell the radiology team if you are pregnant or think you might be, even if it seems obvious.
• After the scan, drink plenty of water if you were given contrast dye, unless your doctor says otherwise.

Medical treatments

Your healthcare team will discuss the scan results with you and recommend a treatment plan. This could include medicines, fluids, monitoring in the hospital, or a procedure, depending on your condition. Your doctor will choose treatments that are appropriate for pregnancy and will explain the risks and benefits to you.

When is surgery considered?

If the CT scan finds a condition that requires surgery, such as a ruptured appendix or a large blood clot, your surgical team will talk to you about the options and how the surgery can be done as safely as possible during pregnancy.

Living with this condition

Most women who need a CT scan during pregnancy go on to have healthy pregnancies and babies. The scan is just one step in identifying a health issue so that it can be treated. After your treatment, you will continue with your usual prenatal care and follow-up appointments.

Lifestyle tips

• Attend all prenatal checkups so your team can monitor your health and your baby's development.
• Tell every new healthcare provider, including those in an emergency, that you are pregnant.
• Keep a list of your current medicines and allergies with you.
• If you are breastfeeding, ask your doctor whether you need any temporary pause after contrast dye.

Diet and exercise

Eat a balanced diet and stay hydrated, as your doctor recommends. Unless your condition requires bed rest, light activity such as walking is usually fine. Always follow the specific advice from your healthcare team, especially after any procedure or surgery.

Mental health and emotional wellbeing

It is normal to feel anxious when a CT scan is recommended during pregnancy. You may worry about your baby or your own health. Talk to your midwife, doctor, or a counselor about your concerns. Asking questions and understanding the reasons for the scan can help reduce fear.

Prevention

You cannot always prevent the health conditions that require a CT scan, but you can reduce unnecessary radiation exposure. Ask your doctor whether an ultrasound or MRI could work instead. If a CT is truly needed, the scan team will use the lowest possible dose and protect your belly with a lead apron.

Screening programmes

During pregnancy, routine prenatal checks usually include ultrasound scans, not CT scans. Ultrasound is the standard way to look at your baby. CT scans are reserved for situations where an ultrasound cannot give enough information and your doctor needs a more detailed picture.

Complications

If left untreated

• If a serious condition like a blood clot or appendicitis is not diagnosed, it can become life-threatening for you and your baby.
• Delayed treatment can lead to more severe illness, which may require emergency surgery or intensive care.

Long-term outlook

The outlook is very good for most women who undergo a CT scan during pregnancy. Modern scanners use low radiation doses, and the risk to the baby from a single scan is extremely small when shielding is used. The main aim is to find and treat the underlying problem quickly, which protects you and your baby. Your healthcare team will guide you through every step.

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