The short answer: Most people get screening mammogram results within about 2 weeks, and many see them in a patient portal within a few days. Federal law sets the outer limits. The facility must send you a plain-language summary within 30 calendar days of the exam, or within 7 calendar days of the final reading if the result is "Suspicious" or "Highly Suggestive of Malignancy." A diagnostic mammogram is often read before you leave.
What does federal law say about how fast you must get results?
Every mammography facility in the United States works under the Mammography Quality Standards Act (MQSA). The rules for results are in 21 CFR 900.12(c). They set three deadlines that matter to patients:
- Every exam: the facility must give you a summary "written in lay terms within 30 calendar days of the mammographic examination."
- Suspicious or highly suggestive results: the lay summary must reach you "within 7 calendar days of the final interpretation of the mammograms."
- Your doctor: the full report goes to your named provider "as soon as possible, but no later than 30 days" after the exam. For suspicious results, it is also 7 calendar days.
The 7-day clock starts at the final interpretation, not the exam date. If the radiologist needs more images first, the clock does not start until the final reading.
If you did not name a doctor, the facility must send you the full report as well as the lay summary. It must also have a system to refer you to a provider when the result needs follow-up.
What changed when the updated FDA rule took effect in 2024?
The FDA published an amended MQSA rule in the Federal Register on March 10, 2023. According to the FDA's summary of the final rule, enforcement began on September 10, 2024. Two changes affect your wait.
First, the rule added the firm 7-calendar-day deadline for positive results. The FDA said the addition keeps the 30-day and 7-day deadlines consistent for patients and for referring doctors.
Second, every lay summary must now include a breast density statement. If your tissue is dense, the letter must say so. It must also say that "other imaging tests in addition to a mammogram may help find cancers." If your tissue is not dense, the letter uses a matching "not dense" statement. Our guide to dense breasts explains what those categories mean.
The rule also handles one common delay. Sometimes the radiologist needs your older mammograms for comparison. The report is then marked "Incomplete: Need prior mammograms for comparison." A follow-up report with a final category is due within 30 calendar days of that first report, whether or not the old images arrive.
Do screening and diagnostic mammograms come back at different speeds?
Yes. The two exams run on different workflows, which our comparison of screening vs. diagnostic mammograms covers in more detail.
- Screening mammogram: you usually leave before a radiologist reads it. The National Cancer Institute says you will get the report "within about 2 weeks, either by mail or in your electronic medical record."
- Diagnostic mammogram: a radiologist is usually on site and checks the images during the visit. The American Cancer Society says that after a callback, "you will most likely be given the results of your tests during the visit."
The American Cancer Society also notes that practice varies. A radiologist might review results with you right after the test, or you might hear within a few days.
The final report uses a BI-RADS category, the standard scale radiologists use to sort findings and next steps.
Why did my result show up in the portal before my doctor called?
This is often the result of the 21st Century Cures Act. Its information blocking rules limit practices that delay a patient's access to their own electronic health information.
The federal health IT office (ONC) says a delay can be legitimate when the patient asks for it. In an ONC FAQ on delaying test results, it says a delay "should be for no longer than necessary" to meet that request. Examples include waiting 3 days or waiting until your clinician has reviewed it. Without such a request, the American Cancer Society notes, your results may appear in the portal at the same time your provider gets them.
So you may read "Suspicious" or "Incomplete" in the portal before anyone explains it. Many patients still prefer this. In a survey of just over 8,000 patients across four academic centers, ONC reported that 95.7 percent wanted immediate release to continue. Among those with abnormal results, 95.3 percent did. Abnormal results were linked to nearly twice the likelihood of worry.
If you would rather hear from your doctor first, ask the facility or your provider whether you can set a delay. You can also hold off on opening the portal message.
What can slow down your results?
Most delays come from a few causes:
- Waiting for prior images. Comparison with old mammograms helps the radiologist avoid false alarms. It can add time, up to the 30-day follow-up limit above.
- Batch reading. Screening exams are often read later in the day or on another day, not while you wait.
- Mail. A paper letter adds days that a portal does not.
- Wrong contact details. An old address or phone number can send your letter to the wrong place.
A short wait is not a sign of bad news. A longer one is not either. The 7-day rule means suspicious findings move faster, not slower.
What should you do if you have not heard back?
Do not assume silence means a normal result. The American Cancer Society says, "If you don't hear from your healthcare provider within 10 days, do not assume that your mammogram was normal." The NCI gives a 2-week mark. RadiologyInfo.org, run by the American College of Radiology and RSNA, gives the same advice: ask when results will be ready and do not assume they are normal if you hear nothing.
- Check your patient portal first. The report may already be there.
- Call the imaging facility. Ask whether the exam has a final reading and where the letter went.
- Confirm your address, phone number and named provider are correct.
- If the report says "Incomplete," ask what images or records they still need.
- If you have a new lump, skin change or nipple discharge, call your doctor now. Do not wait for a screening letter. symptom.md has general guidance on which symptoms need prompt care.
If you get called back, our callback guide walks through what happens next.
The bottom line
Expect screening results in about 2 weeks, often sooner through a portal. Diagnostic results are usually given during the visit. By federal rule, the facility must send you a plain-language summary within 30 calendar days, and within 7 calendar days of the final reading for suspicious results. That summary must now tell you whether your breasts are dense. If 10 days to 2 weeks pass with no word, call the facility.
Last updated: September 2026. This article is for informational purposes only and does not constitute medical advice. Talk with your healthcare provider or imaging facility about your own results and follow-up.