How Long Do OBSP Results Take — and What Does Your Mammogram Letter Actually Mean?

By Kamandeep Chhabra, CCPA, MRT(N) — Director of Operations & Physician Relations, Limeworth X-Ray & Ultrasound, Hamilton

One of the hardest parts of any screening test is the wait afterward. You’ve had your mammogram, you feel fine, and now you’re watching the mailbox. Let me walk you through exactly what happens after your Ontario Breast Screening Program (OBSP) mammogram — how long results take, what the letter says, and how to read it without second-guessing every word.

How Long Will You Wait?

For most people, OBSP results arrive within about two weeks, though it can occasionally take up to three, especially around busy periods or holidays. Two things happen behind the scenes: a radiologist reads your images, and the result is sent both to you (by mail) and to your family doctor or nurse practitioner, if you have one.

If you self-referred and don’t currently have a primary care provider, don’t worry — the OBSP still mails your results directly to you, and if any follow-up is needed, the program helps coordinate it.

If three weeks go by and you’ve heard nothing, it’s completely reasonable to call the clinic where you were screened and simply ask. No result should fall through the cracks, and a quick phone call settles your mind.

Reading a "Normal" Result

Most letters are normal, and a normal OBSP letter usually tells you three things: that nothing concerning was seen, when you’re due to screen again (typically every two years for average risk), and your breast density.

That last point is newer and catches people off guard. Ontario now reports your breast density category on your results letter. Dense breasts are common and normal, but they can make a mammogram a little harder to read, so it’s worth mentioning to your doctor — especially if your letter says you’re in the higher-density categories.

A normal result is genuinely reassuring, but it isn’t a reason to skip your next screen. Breast tissue changes over time, and the whole point of screening every couple of years is to catch anything new early.

What If You’re Asked to Come Back?

Here’s the part that makes hearts race: a letter or phone call asking you to return for more images. Please take a breath, because this is far more common — and far less scary — than it feels.

Being recalled does not mean you have cancer. About 1 in 10 people are called back after a screening mammogram, and the rate is higher (around 15%) after your very first one, simply because there are no earlier images to compare against. The radiologist just wants a clearer or closer look at something, which very often turns out to be normal tissue overlapping, a benign cyst, or an area that needs a magnified view.

A recall means a diagnostic appointment — usually a few extra mammogram views and often a breast ultrasound. Many people get their answer the same day.

If you’ve been recalled and you’re in Hamilton, you don’t have to wait weeks for peace of mind. We offer fast diagnostic mammogram and breast ultrasound appointments, Saturdays included.

A Few Things Worth Doing

• Keep your letters. Your density and prior results are useful context for your doctor and for future screening.

• Bring prior imaging if you’ve been screened elsewhere — comparison images reduce unnecessary recalls.

• Update your info. If you’ve moved or changed doctors, make sure the clinic has your current mailing address so your letter reaches you.

• Book your next screen on time. If your letter says two years, put a reminder in your calendar now.

When Results Point to Next Steps

If your follow-up imaging shows something that needs a closer look, your healthcare team coordinates the next step — which might be a short-interval follow-up or, less often, a biopsy. The large majority of recalls end with a return to routine screening and nothing more.

The system is built to be careful with you. A slightly longer wait, or an extra set of images, is the program doing its job thoroughly — not a signal that something is wrong. Understanding what each letter means is the best way to keep the worry in proportion and stay on top of your screening.

If the Waiting Gets to You

The stretch between your mammogram and your letter can feel longer than it is. If you find yourself checking the mailbox with a knot in your stomach, that’s completely normal. A couple of things help: note roughly two weeks on your calendar so you have a realistic date in mind, and remember that most results come back normal. If you truly can’t settle, it’s perfectly fine to call the clinic and confirm your images are being read.

Frequently Asked Questions

How long do OBSP mammogram results take in Ontario?

Usually about two weeks by mail, and occasionally up to three. Your family doctor or nurse practitioner is notified as well. If it’s been longer than three weeks, call the clinic where you were screened.

What does a normal OBSP results letter say?

That nothing concerning was seen, when to screen again (usually every two years for average risk), and your breast density category. A normal result still means you should keep to your regular screening schedule.

Does being called back mean I have cancer?

No. About 1 in 10 people are recalled, more often after a first mammogram, and the large majority turn out to be normal or benign. A recall simply means the radiologist wants clearer images.

Can I get fast follow-up imaging in Hamilton if I’m recalled?

Yes. Limeworth offers quick diagnostic mammogram and breast ultrasound appointments, including Saturdays. Email your recall letter or requisition with your phone number to 849xray@gmail.com.

Book Your Mammogram in Hamilton

Limeworth X-Ray & Ultrasound is a proudly OBSP-participating, ICHSC-accredited diagnostic clinic on the Hamilton Mountain, near CF Lime Ridge Mall with Dynacare bloodwork right across the hall. Our experienced, compassionate female mammography technologists, modern digital mammography and breast ultrasound, and fast appointments (including Saturdays) make breast imaging easy.

To book: For an OBSP screening mammogram, women aged 40–74 can self-refer — email your phone number to 849xray@gmail.com or call 905-574-7755. For a diagnostic mammogram or breast ultrasound, send your doctor’s requisition to the same address.

📍 Suite 102, 849 Upper Wentworth St, Hamilton, ON L9A 5H4  |  Mon–Fri 8am–6pm, Sat 8am–4pm  |  Serving Hamilton, Ancaster, Dundas, Stoney Creek, Waterdown, Burlington, Binbrook, Flamborough, Brantford & Paris.