CT Scan in Toronto and the GTA: How to Book at King City.

If your doctor has ordered a CT scan and you live in Toronto or elsewhere in the GTA, the hospital named on your requisition is not your only option. King City Diagnostic Imaging is an outpatient clinic at 1700 King Road that accepts CT requisitions from physicians and nurse practitioners across the GTA. This guide covers who can book, what you need, and what the appointment involves.

Quick Facts: CT Scans at King City Diagnostic Imaging

A CT scan requires a requisition from a physician or nurse practitioner, and diagnostic CT cannot be self-referred in Ontario. CT is booked by appointment only. CT scans are OHIP-insured when medically necessary, and our staff confirm coverage for your exam when you book. A radiologist reviews your images within 24 to 48 hours, and the report is faxed to your referring physician.

Yes. We accept CT requisitions from providers across Toronto and the GTA, and your report goes directly to your referring provider’s office. You do not need to live in King City or York Region. You do need a valid requisition from your physician or nurse practitioner, and a valid Ontario Health Card for OHIP-insured exams.

• A signed requisition from your physician or nurse practitioner (your doctor’s office can use our CT scan requisition form)
• Your Ontario Health Card or other valid identification
• A list of your current medications and any prior imaging reports to bring on the day

To book, call 905-539-0555 or book online and upload your requisition with the form.

A CT exam, short for computed tomography, is a painless imaging test that uses multiple X-rays and a computer to create detailed, three-dimensional pictures of the inside of your body. CT exams are performed by a CT technologist and interpreted by a radiologist. Doctors order a CT exam for reasons such as:

• Checking for internal bleeding or injuries after a serious accident
• Finding the cause of sudden, unexplained pain, such as in the chest or belly
• Guiding doctors during a biopsy, surgery or radiation treatment
• Seeing whether a disease or cancer treatment is working properly

Every CT scan at King City Diagnostic Imaging is booked with a requisition from a physician or nurse practitioner.

CT can examine the head, sinuses, chest, abdomen, pelvis, spine and joints. It shows bones, organs, soft tissues and blood vessels in far more detail than a standard X-ray, which is why doctors use it to look for:

• Fractures, including complex or subtle breaks
• Infections and inflammation
• Organ abnormalities or diseases
• Blood clots, aneurysms and blood vessel diseases
• The size and location of tumors, and how a tumor is responding to treatment

Your doctor decides which exam answers your clinical question. Sometimes an X-ray or an ultrasound is the better first test, and our guide to referrals for diagnostic imaging in Ontario explains how requisitions work for each type of exam.

A plain X-ray is fast and low dose, but structures overlap on a single image. Ultrasound uses sound waves with no radiation and works in real time, but it is blocked by bone and gas. CT produces cross-sectional detail in seconds, which makes it the workhorse for trauma, abdominal pain, chest disease, kidney stones and blood vessels. MRI uses a magnetic field and radio waves with no radiation and gives excellent soft tissue detail, but it takes much longer and excludes people with certain metal implants.

One useful reassurance: metal is a safety exclusion for MRI but only an image quality issue for CT, so a pacemaker or metal implant that rules you out of an MRI generally does not rule you out of a CT. Tell staff about any implants when you book. Our guide to CT scans in Ontario compares the options in more detail.

Some patients prefer an outpatient clinic to a hospital campus. At King City you will find free on-site parking, a ground-floor, wheelchair-accessible clinic, and most exams are booked within one to two business days, depending on availability.

Wait times also differ between facilities, even for the same priority level. It is reasonable to ask your doctor whether your requisition can be sent to a facility that can see you sooner. Our guide to CT scans in Ontario explains how CT priority levels and wait times work, and how waits varied across York Region hospitals in 2026.

The clinic is on the ground floor with wheelchair-accessible entry and free on-site parking.

We are at Unit 1, Building H, 1700 King Road, King City, ON L7B 0N1, with access from Highway 400 and Highway 404. Parking is free. CT is by appointment only:

• Monday to Friday: 8:30 AM to 5:30 PM
• Saturday: 8:30 AM to 5:00 PM
• Closed on statutory holidays

• Arrive 15 minutes early and check in at reception.
• The CT technologist confirms your exam instructions. You may be asked to change into a gown and remove metal objects.
• You lie on a table that slides through a ring-shaped scanner. You may be asked to hold your breath for a few seconds, and the scan itself takes just a few minutes.
• If your exam uses contrast, you may receive it by mouth or through an IV. The injection is quick, and a temporary warm sensation is common.
• Afterwards you can return to your regular activities.

Preparation depends on the area being scanned and whether contrast is needed. Our CT scan preparation checklist covers what to wear, what to bring, and what to tell staff.

A radiologist analyzes your images within 24 to 48 hours, and sooner when results are urgently needed. The report is faxed to your referring physician right after. Your referring provider discusses the results with you and arranges any follow-up, so contact their office with questions about your results.

Whether you are weighing a hospital against a community clinic for a CT scan Toronto patients can book, compare the options on the details that affect your day, not only on distance:

• How soon can I be scheduled for my priority level?
• Does my exam use contrast, and are there fasting instructions?
• Is the clinic accessible, and is parking free?
• How and when will my results reach my referring provider?

Ontario assigns every imaging requisition a priority from 1 to 4, with targets of 24 hours, 48 hours, 10 days and 28 days, and a radiologist decides where your scan falls. Our article on imaging wait times and OHIP coverage in Ontario explains how the four priority levels work and what you are entitled to ask for.

King City is north of Toronto, and patients come to us from across the region. If you are planning around where you live, these guides cover the details:

• CT scan in Richmond Hill, Vaughan and Markham
• CT scan in Aurora, Newmarket and northern York Region
• CT scan for North York and Toronto patients

If you would rather follow the whole process from start to finish, read how to book a CT scan in Ontario.

Do I need a referral for a CT scan in Toronto?

Yes. In Ontario, a CT scan requires a requisition from a physician or nurse practitioner. The requisition gives the clinical information needed to choose the right scan protocol and to decide whether contrast is required.

Can my Toronto doctor send my CT requisition to King City?

Yes. We accept requisitions from physicians and nurse practitioners anywhere in the GTA. If you are unsure whether your requisition can be used here, call us at 905-539-0555 before you book.

Is a CT scan at King City covered by OHIP?

CT scans are OHIP-insured when they are medically necessary and ordered by a physician or nurse practitioner. Coverage depends on your eligibility and the exam requested, and our staff confirm whether your scan is covered before your exam.

Can I walk in for a CT scan?

No. CT is by appointment only. Walk-in service at King City is for X-ray.

How long does a CT scan take?

The scanner takes images in just a few minutes. Your visit will be longer than that, because you check in 15 minutes early, the technologist confirms your instructions, and some exams use contrast.

Is a CT scan safe?

CT scans use ionizing radiation. The dose is kept as low as reasonably achievable while maintaining diagnostic image quality, using dose-reduction protocols tailored to each patient and exam. The decision to perform a CT scan is based on clinical need and the expected diagnostic benefit compared with the small risk of radiation exposure. Patients who are pregnant or may be pregnant must tell staff before the exam.

Can I book an X-ray or ultrasound at the same visit?

If your provider has also requested other imaging, ask our staff when you call about the best way to schedule everything together. King City offers walk-in X-ray and ultrasound by appointment in addition to CT.

What should I bring to a CT appointment?

Bring your requisition, your Ontario Health Card, a list of your current medications and any prior imaging reports, and arrive 15 minutes early. Our CT scan preparation checklist covers what to wear and what to tell staff.

If your doctor has ordered a CT scan, call 905-539-0555 or book your appointment online. Learn more about CT scans at King City Diagnostic Imaging.