Last Updated on October 22, 2025 by mcelik
Every year, 1.5 million PET scans are done in the United States to help diagnose and treat various health issues. Understanding post scan precautions is important for patient safety and ensuring the effectiveness of the test. After a PET scan, patients are advised to drink plenty of fluids to help flush the radioactive tracer from the body.
It is also recommended to avoid close or prolonged contact with pregnant women and young children for about 6 to 8 hours as a precaution. Most patients can return to their normal activities immediately, but if sedation was used, additional precautions like avoiding driving or operating machinery are necessary. Following these post scan precautions helps minimize radiation exposure to others and supports a safe recovery after the procedure.
Key Takeaways
- Understand the importance of wearing comfortable, metal-free clothing during a PET scan.
- Learn about the necessary precautions to take after a PET scan.
- Discover how to prepare for a PET scan to ensure its success.
- Find out what activities to avoid after undergoing a PET scan.
- Understand the role of medical imaging precautions in patient safety.
What is a PET Scan and How Does it Work?
It’s important to know what a PET scan is and how it works. A PET scan, or Positron Emission Tomography, is a complex medical imaging method. It shows how the body’s cells work.
Definition and Purpose of PET Scans
PET scans check how the body works, like blood flow and how cells use energy. They help find and manage diseases like cancer and heart problems. They spot areas where the body’s activity is off.
The diagnostic benefits of PET scans include:
- Early detection of diseases
- Monitoring treatment response
- Assessing disease progression
How PET Scans Differ from Other Imaging Tests
PET scans are different from MRI and CT scans. MRI and CT scans show the body’s structure. But PET scans look at how the body’s cells work. This gives doctors a deeper look at what’s going on.
Some key differences between PET scans and other imaging tests include:
- PET scans use a radioactive tracer to visualize metabolic activity.
- They are very good at finding cancer and seeing how treatments work.
- PET scans can also help find problems in the brain by looking at brain activity.
Knowing the distinct advantages of PET scans helps patients see their value in health care.
Do You Wear Clothes During a PET Scan?
Many patients wonder what to wear for a PET scan. The rules for clothes during a PET scan can change. This depends on the test and the hospital’s rules.
General Clothing Guidelines for PET Scans
Patients should wear loose, comfy clothes that are easy to take off. Clothes with metal, like zippers, can mess with the scan. Wearing comfy clothes can also help you relax.
When You Can Keep Your Own Clothes On
Some patients might get to keep their clothes on, if they don’t have metal. But, this choice depends on the scan type and your health. Always listen to what your doctor or the hospital says.
When Hospital Gowns Are Required
At times, you’ll need a hospital gown. This might happen if your clothes could get in the way or if you need a special gown. Hospital gowns are safe for scans and help the test work right.
| Clothing Item | Recommended Action |
| Clothes with metal parts (zippers, buckles, buttons) | Avoid wearing or remove before the scan |
| Comfortable, loose-fitting clothing | Recommended for patient comfort |
| Hospital gowns | Worn when required by medical staff |
Knowing the PET scan clothes rules helps you get ready. By following the medical guidelines and your doctor’s advice, you can make the test go smoothly.
Preparing for Your PET Scan: Clothing and Accessory Requirements
Knowing what to wear for a PET scan is key for a good result. The right clothes help avoid problems during the scan.
What to Wear to Your Appointment
Wear loose, comfy clothes for your PET scan. Stay away from clothes with metal, like zippers or jewelry. Wearing something comfy can make you feel less anxious.
Jewelry, Accessories, and Metal Objects
Take off all jewelry and metal items before the scan. This includes necklaces, earrings, watches, and clothes with metal. Don’t bring valuable things to the scan place.
| Item | Recommended Action |
| Jewelry | Remove before scan |
| Clothing with metal parts | Change into metal-free clothing |
| Watches and glasses | Remove before scan |
Comfort Considerations for the Procedure
Wearing comfy clothes is important because you’ll be lying down for a while. Being relaxed helps get better images. Scan places might give you blankets or pillows for comfort.
Dressing right and knowing about accessories and metal helps a lot. It makes your PET scan go smoothly.
Different Types of PET Scans and Their Specific Requirements
Medical conditions need different PET scans, each with its own rules. It’s key for patients to know these to get ready for their tests.
PET-CT Scan Clothing Protocols
PET-CT scans mix PET and CT tech for detailed info. Patients should wear loose, comfy clothes without metal parts. Avoiding metal zippers or buttons helps avoid image problems.
Remove jewelry, glasses, or metal items for the scan. This ensures the PET and CT parts work well together.
Brain, Cardiac, and Full-Body PET Scan Variations
There are many PET scans for different needs, like brain, cardiac, and full-body scans. Each has its own needs for the best results.
| Type of PET Scan | Specific Requirements |
| Brain PET Scan | May need fasting or avoiding some meds. Stay very quiet during the scan. |
| Cardiac PET Scan | Includes stress tests. Avoid caffeine and some meds before. |
| Full-Body PET Scan | Requires lying very quietly for a long time. Follow the same dress code as PET-CT scans. |
Knowing what each PET scan needs helps patients get ready. This makes sure the scans are done right and useful.
The Role of Radioactive Tracers in PET Scans
Radioactive tracers are key in PET scans. They help create detailed images of the body’s inner workings. These tracers emit radiation that the PET scanner picks up, showing how the body’s cells are working.
How Radioactive Tracers Work
Radioactive tracers build up in areas of the body that are very active, like cancer cells. The most used tracer is Fluorodeoxyglucose (FDG). It’s a special glucose molecule with a radioactive atom. When injected, it goes to cells that use a lot of glucose, helping the PET scanner spot these areas.
The steps include preparing the tracer, injecting it, and then scanning. The tracer decays, sending out positrons that meet electrons and create gamma rays. These rays are what the PET scanner detects.
Types of Tracers Used in Different Diagnostic Tests
Various tests use different tracers to show different things. For example, Fluorine-18 is often used for cancer tests. Rubidium-82 is used for heart scans. The right tracer depends on what the test is looking for and where in the body it is.
Duration of Radioactivity in Your Body
Radioactive tracers don’t stay in the body for long. They have a short half-life, meaning they quickly lose their radioactivity. For instance, Fluorine-18’s half-life is about 110 minutes. This means the radioactivity drops off quickly after the scan. People are told about radiation safety precautions to protect others, like pregnant women and kids.
The PET Scan Procedure: Step by Step
Learning about the PET scan procedure can ease anxiety for patients. A PET scan is a detailed medical imaging method for diagnosing health issues. It includes several steps, from preparation to scanning.
Before Entering the Scanning Room
Patients arrive at the imaging facility and receive instructions. It’s important to follow these steps carefully for a successful scan. They might need to change into a hospital gown, remove metal objects, and avoid certain foods or drinks.
Preparation is key for a good PET scan. Tell your healthcare provider about any medications and allergies.
Positioning and Comfort During the Scan
In the scanning room, the patient lies on a table that slides into the PET scanner. The technologist makes sure the patient is comfortable and positioned right for the best images.
The scan is painless but might feel claustrophobic. Talking openly with the technologist can help with any discomfort.
| Scan Type | Duration | Patient Position |
| PET-CT Scan | 20-30 minutes | Lying down |
| Brain PET Scan | 30-45 minutes | Lying down, head first |
| Cardiac PET Scan | 30-60 minutes | Lying down |
Duration and What to Expect
The time for a PET scan varies by type and body area. It can last from 30 minutes to several hours, including prep time.
Patients must stay very quiet during the scan. The technologist watches from another room, talking through an intercom.
It’s vital to stay calm and listen to the technologist for the best results.
Understanding PET Scan Radiation Exposure
Knowing how much radiation you get from a PET scan is key. PET scans use tiny amounts of radioactive tracers to check health. It’s important to know about the radiation to make smart choices about your health.
Radiation Levels Compared to Other Medical Procedures
PET scans give off moderate amounts of radiation. A typical PET scan’s radiation is between 4 to 7 millisieverts (mSv). For example, a chest X-ray has about 0.1 mSv, and a CT scan of the abdomen and pelvis can be 10 to 20 mSv. Here’s a table to show how they compare:
| Diagnostic Test | Typical Effective Dose (mSv) |
| Chest X-ray | 0.1 |
| PET Scan | 4-7 |
| CT Abdomen/Pelvis | 10-20 |
Safety Measures Implemented by Medical Facilities
Hospitals take many steps to lower radiation from PET scans. They use the least amount of radioactive tracer needed. They also make sure the equipment works right and that staff follow strict safety rules.
Long-term Radiation Considerations
Getting a PET scan once is usually safe. But getting many scans can raise the chance of health problems like cancer. Yet, PET scans are often very helpful in finding and managing serious health issues. It’s important to talk to your doctor about your risks and worries.
Understanding PET scan radiation and how to reduce it helps patients feel more in control of their health care.
Post Scan Precautions: Essential Guidelines to Follow
After your PET scan, it’s important to follow certain precautions. This is to keep you safe and prevent others from being exposed to the radioactive tracer. These steps help you recover smoothly and safely.
Immediate Actions After Your PET Scan
Right after your PET scan, there are a few things you need to do. Drink plenty of water to get rid of the tracer. Also, void your bladder frequently to lower radiation exposure.
- Remove any clothing that may have come into contact with the tracer.
- Shower or bathe as soon as possible to minimize skin contact with any residual tracer.
Hydration Requirements
Staying hydrated is very important after a PET scan. Drinking plenty of fluids helps get rid of the tracer faster. Try to drink at least 8-10 glasses of water in the 24 hours after your scan.
Activity Restrictions
While the tracer is leaving your body, it’s best to limit close contact with others. This is true for pregnant women, children, and people with weak immune systems.
- Avoid close contact for at least 4-6 hours after the scan.
- Minimize time spent in crowded areas or public transportation.
- Follow any additional guidelines provided by your healthcare provider.
By taking these precautions, you can keep yourself and others safe.
Contact Limitations Following Your PET Scan
After a PET scan, it’s important to limit close contact with others. This is to keep everyone safe. The scan uses a radioactive tracer that can release radiation. This could harm those nearby, like pregnant women and young children.
General Guidelines for Limiting Close Contact
Patients are told to stay away from pregnant women and kids after a PET scan. They are more at risk from radiation. Keeping a safe distance helps lower the chance of radiation exposure.
Duration of Contact Restrictions
The time you need to limit contact depends on the tracer’s half-life. It’s usually a few hours to a day. Always listen to what your doctor says about this.
Public Spaces and Transportation Considerations
When on public transport or in crowded places, be mindful of your surroundings. Try to keep a distance from others. Sitting in less crowded spots or avoiding busy times can help.
By following these tips, you can reduce the risks of radiation exposure after a PET scan. This makes a safer space for you and those around you.
Special Precautions for Interaction with Vulnerable Populations
When dealing with vulnerable groups like infants and pregnant women after a PET scan, we must be careful. The tracer used in PET scans can release radiation. This could harm sensitive people. So, it’s key to take special precautions to lower exposure risks.
Infant Exposure Guidelines
Infants need special care after a PET scan. The American College of Radiology says to keep a safe distance for at least 6 hours. Try not to hold or feed them during this time.
Here are some tips to reduce exposure:
- Keep at least 3 feet away from infants.
- Avoid eye contact or close face-to-face interaction.
- Have someone else look after the baby if you can.
Precautions Around Pregnant Women
Pregnant women are also at risk from radiation. After a PET scan, limit contact with them for a while. This is to protect the unborn baby.
| Precaution | Guideline |
| Close Contact | Avoid for at least 6 hours |
| Proximity | Maintain 3 feet distance |
Elderly and Immunocompromised Individuals
The elderly and those with weakened immune systems are not as risky for radiation. But, it’s good to keep hygiene practices up. Washing your hands well can help prevent any risks.
Breastfeeding Guidance After a PET Scan
PET scans use radioactive tracers, which can affect breastfeeding. It’s key for nursing moms to know the rules after the scan. The main worry is the baby getting radioactive stuff through breast milk.
Temporary Cessation Recommendations
Doctors usually tell breastfeeding moms to stop nursing after a PET scan. How long to wait depends on the tracer used. Moms are told to wait until the tracer is safe.
- Duration: It’s usually a few hours to a couple of days.
- Guidance: Always follow what your healthcare team says.
Expressing and Discarding Milk
While waiting, moms should keep pumping to keep milk coming. Then, they should throw it away. This keeps the baby safe from radioactive tracers in the milk.
- Keep pumping as you normally do.
- Put the milk in a safe place.
- Throw it away as your doctor tells you to.
Talking to your doctor before the PET scan is a must. They can give you the right steps and advice for your situation.
Radiation Safety in Your Home Environment
Keeping your home safe from radiation after a PET scan is key for your family’s health. The tracer used in PET scans gets less radioactive over time. But, it’s important to take steps to lower exposure.
Bathroom Usage and Hygiene Practices
Good hygiene is a must after a PET scan, mainly in the bathroom. Flush the toilet twice after each use to cut down on radioactive spread. Also, wash your hands well with soap and water to lessen radiation risk.
For the first 24 hours, avoid sharing personal care items. Clean bathroom surfaces often. This cuts down on radioactive contamination risks.
Handling Personal Items and Laundry
When dealing with personal items and laundry after a PET scan, be careful. It’s best to wash your clothes alone to avoid spreading radioactive material. Even though the risk is small, waiting 24 to 48 hours before laundry helps the tracer decay more.
Sleeping Arrangements
There’s no need to sleep in separate beds after a PET scan. But, if you’re worried about radiation to your partner, keep a reasonable distance while sleeping. The tracer’s effect weakens with distance.
By taking these easy safety steps, you can reduce radiation exposure at home. Remember, the tracer decays fast, and most people can go back to normal activities soon after the scan.
When to Contact Your Healthcare Provider After a PET Scan
After a PET scan, it’s key to know the difference between normal side effects and serious symptoms. Some reactions are expected, but others need quick medical help.
Normal Side Effects vs. Concerning Symptoms
After a PET scan, you might feel some side effects from the radioactive tracer. These can include mild discomfort at the injection site, fatigue, or a metallic taste. These symptoms usually go away on their own.
But, if you have severe reactions like trouble breathing, a fast heartbeat, or a big increase in pain, call your healthcare provider right away.
Watch the injection site for signs of infection, like redness, swelling, or more pain. If you see these signs, it’s smart to talk to your healthcare provider.
Emergency Situations
It’s rare, but a PET scan can cause an allergic reaction to the tracer. Signs of an allergic reaction include hives, itching, or swelling of the face, lips, tongue, or throat. If you see these, get emergency medical help fast. Also, if you’re worried about your scan results interpretation or have symptoms that don’t seem related to the PET scan, call your healthcare provider.
Knowing when to seek help is important for your safety and care. Always follow the medical imaging guidelines from your healthcare facility for after a PET scan.
Conclusion: Balancing Diagnostic Benefits with Radiation Precautions
PET scans are a key tool in medicine, helping doctors diagnose and treat many conditions. It’s important for patients to know the benefits and risks of these scans.
Patients can lower their radiation exposure by following certain guidelines. This includes wearing the right clothes and accessories, understanding the use of radioactive tracers, and taking care after the scan.
PET scans offer many benefits, like helping doctors find and track diseases. But, it’s also important to know the risks of radiation. Taking the right precautions can help reduce these risks.
Doctors have a big role in teaching patients about PET scans and how to stay safe. By working together, patients can have safe and effective scans. This way, they get the most benefits while keeping radiation exposure low.
FAQ
What is a PET scan, and how does it differ from other imaging tests like MRI or CT scans?
A PET scan uses a radioactive tracer to see how the body works. It’s different from MRI or CT scans because it looks at how the body uses energy, not just its structure.
Do I need to wear a hospital gown during a PET scan?
It depends on your PET scan. Sometimes, you can wear your clothes. Other times, you might need a hospital gown to avoid blocking the tracer.
What should I wear to my PET scan appointment?
Wear comfortable, loose-fitting clothing free of metal, such as zippers, buttons, or jewelry, to ensure accurate imaging.
How long does the radioactive tracer remain in my body after a PET scan?
The tracer usually goes away in a few hours. But, it’s good to follow safety steps to protect others.
What are the post-scan precautions I should follow after a PET scan?
Stay hydrated and avoid close contact with others. This includes babies and pregnant women. Follow radiation safety at home.
Can I breastfeed after a PET scan?
It’s best to stop breastfeeding for a while after a PET scan. The tracer can be in breast milk. Your doctor will tell you when it’s okay to start again.
How can I minimize radiation exposure to others after a PET scan?
Keep your distance from others and avoid crowded places. Wash your hands well after using the bathroom.
What are the guidelines for interacting with vulnerable populations after a PET scan?
Keep a safe distance from babies, pregnant women, and people with weak immune systems. Follow your doctor’s advice to protect them from radiation.
When should I contact my healthcare provider after a PET scan?
Call your doctor if you have severe pain, trouble breathing, or an allergic reaction. They’ll also tell you when to expect your results and when to come back.
Are there any long-term radiation considerations after a PET scan?
PET scans are usually safe, but talk to your doctor if you’re worried. This is more important if you’ve had many scans or have health issues.
References
Ganesh Diagnostic. (2025, April 15). Understand PET CT scan: Preparations, precaution and FAQs. Retrieved from https://www.ganeshdiagnostic.com/blog/understand-pet-ct-scan-preparations-precaution-and-faqs
Brown Health. (n.d.). How to prepare for your PET/CT scan – General directions. Retrieved from https://www.brownhealth.org/centers-services/pet-ct/preparing-your-petct-exam/how-prepare-your-petct-scan-general-directions
Boellaard, R., et al. (2014). FDG PET/CT: EANM procedure guidelines for tumour PET imaging: version 2.0. European Journal of Nuclear Medicine and Molecular Imaging, 42(2), 328-354. https://pmc.ncbi.nlm.nih.gov/articles/PMC4315529/
International Atomic Energy Agency. (2014). Standard operating procedures for PET/CT. IAEA Publications. https://www-pub.iaea.org/MTCD/Publications/PDF/Pub1616_web.pdf
