Saliva plays a huge role every single day. When you eat, speak, or swallow, saliva keeps your mouth moist and comfortable. Tiny glands inside and around your mouth work constantly to produce this important fluid.
Sometimes, these glands can become blocked, inflamed, or slow down. If you experience unusual dryness or swelling, your doctor may recommend a special imaging test called a salivary gland scan. While hearing the word scan might feel stressful, this test is safe, gentle, and straightforward.
Key Takeaways About Salivary Gland Scans.
- A salivary gland scan is a safe nuclear medicine test that checks how well your saliva glands work.
- It helps doctors find the root cause of chronic dry mouth, persistent swelling, or suspected blockages.
- The test uses a tiny, safe dose of a radioactive tracer that leaves your body naturally within a day.
- You must inform your medical team if you are pregnant, nursing, or have any known allergies.
- Open communication with your doctor helps ease any anxiety before you undergo the procedure.
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What Is a Salivary Gland Scan?
Simply put, this test is a specialized imaging procedure that belongs to the field of nuclear medicine. The scan takes pictures of your salivary glands to see if they function properly and if saliva flows as it should.
Doctors also call this test a salivary gland function scan because it focuses on how well the glands perform their job. Because the procedure provides clear details about your major parotid glands located near your cheeks, medical professionals sometimes refer to it as parotid scintigraphy.
Why Do Doctors Recommend This Scan?
Your doctor may suggest this test for several important reasons. If you experience specific symptoms, this diagnostic tool helps uncover the underlying cause behind them.
| Symptom or Condition. | Simple Explanation. |
|---|---|
| Blocked Glands or Growths. | If your doctor suspects a small stone, physical blockage, or growth in the tiny tubes carrying saliva, this test confirms it. |
| Swelling or Pain. | When you feel persistent pain or swelling inside your mouth, along your jawline, or near your ears, this scan checks for gland issues. |
| Chronic Dry Mouth. | Some people suffer from a constant dry mouth, known medically as xerostomia. This scan helps determine if your glands produce enough saliva. |
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Check Availability →How Does This Scan Work?
The procedure relies on two main elements. The first element is a special gamma camera that captures images, and the second element is a safe radioactive tracer substance.
Hearing the word radioactive can sound alarming, but the test uses a very small, harmless dose. Think of the tracer substance like a tiny GPS tracker inside your body. Once introduced, it mixes with your saliva and travels directly into your salivary glands. The special camera tracks the movement of this tracer, allowing your doctor to see how fast saliva flows and whether anything blocks its path.
Simply put, this creates a live roadmap of your saliva pathways, helping doctors pinpoint exactly where a problem occurs.
How Should You Prepare for the Scan?
Preparing for this test requires very little effort. However, you should keep a few important details in mind:
- When you arrive for the test, remove all metal jewelry, earrings, and necklaces from your head, face, and neck area.
- Inform the medical staff right away if you have any known food or medicine allergies.
- This step is vital: tell your doctor or medical staff right away if you are pregnant, suspect you might be pregnant, or are currently breastfeeding.
What Happens During the Scan?
Knowing what to expect during your appointment can help you feel calm and relaxed. The process is straightforward and gentle.
First, a technician asks you to lie down comfortably on a special table in the nuclear medicine department. Next, the imaging equipment, which resembles an X-ray machine, moves close to your face and neck without touching your skin.
The technician then injects a tiny amount of the tracer substance into a vein in your arm. You might feel a quick pinch, similar to getting a routine blood test. The first part of the scanning process begins right away, capturing images of your salivary glands for about 45 minutes. You will feel no pain during this time. Your only job is to lie quietly and stay still.
After the first set of pictures, you receive a small lemon wedge, a sour candy, or another tart item to eat. This tart food stimulates your salivary glands to produce saliva quickly. The equipment then captures another 20 minutes of images to measure how fast your glands respond and clear the fluid.
Once the imaging finishes, you are free to get up and leave. The entire process typically takes about one hour to an hour and a quarter.
What Should You Do After the Scan?
After your scan finishes, you can return to your normal daily activities right away. Unless your doctor gives you other specific instructions, you face no major restrictions.
However, to minimize radiation exposure to others from the tiny remaining tracer in your body, follow these simple hygiene steps during the first 24 hours:
- During the first 24 hours after your scan, flush the toilet right away every time you use the restroom, as small amounts of the tracer leave your body through waste.
- Always wash your hands thoroughly with soap and water after using the bathroom.
Are There Any Risks with This Scan?
The benefits of this test far outweigh the very low risks. The amount of radioactive tracer used is extremely small, and your body eliminates it naturally within a single day.
However, certain special situations require postponing or avoiding this test:
| Special Situation. | What You Should Know and Do. |
|---|---|
| Tracer Allergies. | Tell your doctor right away if you have ever had an allergic reaction to similar diagnostic radioactive materials in the past. |
| Breastfeeding Mothers. | The tracer can pass into breast milk. Avoid breastfeeding for one to two days after the test, using expressed breast milk or formula instead while pumping and discarding your milk. |
| Pregnancy. | Radiation exposure may not be safe for an unborn fetus. Doctors usually delay elective scans until after delivery unless it is an emergency. Inform your doctor right away. |
What Do the Scan Results Mean?
A radiologist, who is a specialist in medical imaging, reviews your scan pictures and sends a detailed report to the doctor who ordered your test. Your doctor then discusses these results with you during a follow-up visit.
| Result Type. | What It Means. |
|---|---|
| Normal Result. | This means the tracer moves smoothly through your salivary glands without any blockages or delays, showing healthy gland function. |
| Abnormal Result. |
|
What If Your Results Are Abnormal? Next Steps.
If your test results show an abnormality, your doctor will explain what caused it and discuss the next steps with you. You may review potential medical treatments or receive a referral to an ear, nose, and throat specialist for targeted care.
In some cases, doctors need additional diagnostic information and may recommend a minor tissue biopsy to confirm an exact diagnosis before starting treatment.
When to Seek Emergency Care.
Call 911 (US/Canada), 999 (UK), or visit your nearest emergency department right away if you experience severe swelling in your neck or face that causes breathing difficulties, sudden high fever with severe facial pain, or an inability to swallow your own saliva.
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