Articles · September 28, 2026 · 3 min read

Screening vs. diagnostic mammogram: what the difference is

Same machine, same compression, different purpose. What makes a mammogram screening or diagnostic, what changes on the day, and who decides.

When you book a mammogram, the first thing we ask is whether it is screening or diagnostic. Many people do not know, and that is fine. The answer is on your doctor's order, or it is simply that you have no order and no symptoms, which makes it screening. Here is what the two words mean and why they matter.

A screening mammogram

A screening mammogram is the routine exam. You have no symptoms. Nothing hurts, nothing feels different, and no doctor has asked for a closer look at anything. You are having the exam because it is time for it.

A screening mammogram is four pictures, two of each breast. The whole exam takes about 10 minutes.

You can request a screening mammogram yourself. Fill in our mammography self-request form and bring it, or ask when you book. Most insurance plans cover a screening mammogram at 100 percent, with no cost to you.

A diagnostic mammogram

A diagnostic mammogram is ordered for a reason. There are two common ones.

The first is that you or your doctor noticed something: a lump, pain, discharge, a change in the skin or the shape of the breast. Your doctor orders a diagnostic mammogram to look at it.

The second is that a screening mammogram showed something the radiologist wants to see more clearly. You get a call asking you to come back for more pictures. That return visit is a diagnostic mammogram. It is common, and most of the time the extra pictures show that the area is normal tissue overlapping in a way that looked unusual on the first set.

A diagnostic mammogram adds views beyond the standard four, aimed at the area in question. The radiologist is often in the building and may review the pictures while you are still there. Sometimes a breast ultrasound is added the same day to look at the same spot a different way.

A diagnostic mammogram needs an order from your doctor. It is billed like other exams, so a copay or deductible may apply.

What is the same

Both exams are 3D mammograms at Desert Imaging. We use Hologic Selenia Dimensions systems with the Genius 3D exam at all four centers that do mammography: West, East, Joe Battle and Horizon City.

Compression is part of both. It holds the breast still and spreads the tissue so the pictures are clear. The 3D exam adds no extra compression.

Preparation is the same for both. Wear a two-piece outfit. Skip deodorant, powder, lotion and perfume on your breasts and underarms that day, because they can show up as spots on the pictures. If your last mammogram was somewhere else, bring it or tell us where it was done so the radiologist can compare.

What is different on the day

A screening mammogram is quick and predictable: four pictures, about 10 minutes, and you leave. The report goes to your doctor, usually within 24 to 48 hours, and appears in your patient portal.

A diagnostic mammogram takes longer because there are more pictures, and because the radiologist may look at them before you leave and ask for one more view or an ultrasound. Plan for more time, and know that the extra steps are the point of the exam, not a sign that something is wrong.

Who decides

Your doctor decides when you should start screening and how often, based on your age, your family history and your breast density. Your doctor also decides when a diagnostic exam is needed. If you have a symptom, call your doctor first, not us. We cannot turn a screening appointment into a diagnostic one without an order.

Your result

The radiologist reports every mammogram on a standard scale called BI-RADS, from 0 to 6. A 0 means more pictures or a comparison with older mammograms are needed. A 1 or 2 is normal or benign. A 3 is probably benign, with a follow-up in about six months. A 4 or 5 means the radiologist recommends a biopsy. Your doctor goes over the result with you.

Texas law also requires us to tell you if you have dense breast tissue, because density can make a mammogram harder to read. Your doctor may then order an ultrasound as well.

Where to go

3D mammography is at West, 122 W. Castellano Dr.; East, 1727 Lee Trevino Dr.; Joe Battle, 3080 Joe Battle Blvd., Suite B; and Horizon City, 13650 Eastlake Blvd., Suite A-102. All four are open Saturdays, with evening hours during the week. Request an appointment online or call us.

This article is general information, not medical advice. Follow the instructions your doctor and our staff give you for your exam.

Ready to book your 3D mammography?

Request an appointment online or call (915) 577-0100. Bring your doctor's order and we take it from there.

Request an appointment Call (915) 577-0100

# Screening vs. diagnostic mammogram: what the difference is *Same machine, same compression, different purpose. What makes a mammogram screening or diagnostic, what changes on the day, and who decides.* September 28, 2026 · Desert Imaging When you book a mammogram, the first thing we ask is whether it is screening or diagnostic. Many people do not know, and that is fine. The answer is on your doctor's order, or it is simply that you have no order and no symptoms, which makes it screening. Here is what the two words mean and why they matter. ## A screening mammogram A screening mammogram is the routine exam. You have no symptoms. Nothing hurts, nothing feels different, and no doctor has asked for a closer look at anything. You are having the exam because it is time for it. A screening mammogram is four pictures, two of each breast. The whole exam takes about 10 minutes. You can request a screening mammogram yourself. Fill in our mammography self-request form and bring it, or ask when you book. Most insurance plans cover a screening mammogram at 100 percent, with no cost to you. ## A diagnostic mammogram A diagnostic mammogram is ordered for a reason. There are two common ones. The first is that you or your doctor noticed something: a lump, pain, discharge, a change in the skin or the shape of the breast. Your doctor orders a diagnostic mammogram to look at it. The second is that a screening mammogram showed something the radiologist wants to see more clearly. You get a call asking you to come back for more pictures. That return visit is a diagnostic mammogram. It is common, and most of the time the extra pictures show that the area is normal tissue overlapping in a way that looked unusual on the first set. A diagnostic mammogram adds views beyond the standard four, aimed at the area in question. The radiologist is often in the building and may review the pictures while you are still there. Sometimes a breast ultrasound is added the same day to look at the same spot a different way. A diagnostic mammogram needs an order from your doctor. It is billed like other exams, so a copay or deductible may apply. ## What is the same Both exams are 3D mammograms at Desert Imaging. We use Hologic Selenia Dimensions systems with the Genius 3D exam at all four centers that do mammography: West, East, Joe Battle and Horizon City. Compression is part of both. It holds the breast still and spreads the tissue so the pictures are clear. The 3D exam adds no extra compression. Preparation is the same for both. Wear a two-piece outfit. Skip deodorant, powder, lotion and perfume on your breasts and underarms that day, because they can show up as spots on the pictures. If your last mammogram was somewhere else, bring it or tell us where it was done so the radiologist can compare. ## What is different on the day A screening mammogram is quick and predictable: four pictures, about 10 minutes, and you leave. The report goes to your doctor, usually within 24 to 48 hours, and appears in your patient portal. A diagnostic mammogram takes longer because there are more pictures, and because the radiologist may look at them before you leave and ask for one more view or an ultrasound. Plan for more time, and know that the extra steps are the point of the exam, not a sign that something is wrong. ## Who decides Your doctor decides when you should start screening and how often, based on your age, your family history and your breast density. Your doctor also decides when a diagnostic exam is needed. If you have a symptom, call your doctor first, not us. We cannot turn a screening appointment into a diagnostic one without an order. ## Your result The radiologist reports every mammogram on a standard scale called BI-RADS, from 0 to 6. A 0 means more pictures or a comparison with older mammograms are needed. A 1 or 2 is normal or benign. A 3 is probably benign, with a follow-up in about six months. A 4 or 5 means the radiologist recommends a biopsy. Your doctor goes over the result with you. Texas law also requires us to tell you if you have dense breast tissue, because density can make a mammogram harder to read. Your doctor may then order an ultrasound as well. ## Where to go 3D mammography is at West, 122 W. Castellano Dr.; East, 1727 Lee Trevino Dr.; Joe Battle, 3080 Joe Battle Blvd., Suite B; and Horizon City, 13650 Eastlake Blvd., Suite A-102. All four are open Saturdays, with evening hours during the week. Request an appointment online or call us.