Adding diagnostic OB ultrasound to your practice: what has to be in place

Medically reviewed by Sina Haeri, MD, MHSA, maternal-fetal medicine physician, on September 20, 2026.

Published September 20, 2026

A diagnostic OB ultrasound is a medical test. It needs what an elective scan doesn’t: an order from a licensed clinician, a credentialed sonographer working to a written protocol, a qualified physician to interpret it, and a signed report for the ordering clinician and the patient’s record. All of that has to be in place before the first diagnostic study.

What changes when a scan becomes diagnostic

An elective scan is sold to a parent as an experience. It has no order behind it and no physician interpretation, and nothing from it goes into a medical record. A diagnostic scan exists to answer a clinical question: how far along the pregnancy is, whether it’s viable, how the baby is growing, whether the anatomy looks normal. That makes it a medical test, and medical tests come with obligations an elective studio hasn’t had to meet.

The FDA and the American Institute of Ultrasound in Medicine (AIUM) both draw the line at medical need. The FDA discourages ultrasound done solely for keepsake images or video. AIUM’s position is that fetal ultrasound should be performed for a medical reason by trained, credentialed professionals. States add their own rules on personnel, quality programs and facility accreditation, and as of September 2026 four of them (New Hampshire, New Mexico, North Dakota and Oregon) license sonographers.

So the change isn’t only clinical. Your consent forms and marketing language were written for a retail service, and so was your liability coverage. Talk to your carrier and to a healthcare attorney in your state before the first diagnostic patient, because coverage written for keepsake scanning may not extend to diagnostic work.

The ordering clinician comes first

A diagnostic study starts with an order from a licensed clinician who is treating the patient. Depending on state law that can be a physician, a nurse practitioner, a physician assistant or a certified nurse-midwife. Medicare’s rule puts it plainly: a diagnostic test must be ordered by the practitioner who is treating the patient and who will use the result. Most pregnant patients aren’t on Medicare, but Medicaid programs and commercial plans generally expect an order as well.

The payer rule isn’t the main reason, though. If a scan shows a miscarriage, an ectopic pregnancy or a major anomaly, somebody local has to tell the patient and manage what happens next. A reading physician two states away can identify the finding. They can’t examine her or arrange her follow-up. Without an ordering clinician, her next stop is an emergency room with a printout.

For a studio or mobile practice, ordering relationships usually take one of two shapes. In the first, OB/GYN offices, midwifery practices, family medicine clinics and community health centers send patients to you with an order, the way they would to any imaging center, and the report goes back to them. In the second, a physician or midwife works with your practice directly and orders the studies for the patients she sees. A patient who walks in asking for a diagnostic scan on her own needs an order from her clinician first.

If you don’t have these relationships yet, build them before you shop for a PACS or a read partner. Be wary of any reading service that doesn’t ask who ordered the study.

A credentialed sonographer and a written protocol

AIUM requires accredited practices to use sonographers certified in the specialty they scan, through ARDMS or ARRT. For obstetrics that usually means the RDMS credential with the OB/GYN specialty, which takes two exams: Sonography Principles and Instrumentation, and the OB/GYN specialty exam. Reading physicians and payers commonly expect the same, whether or not you pursue accreditation.

Each exam type has a defined set of images and measurements: dating and viability, growth, the standard anatomy survey, the detailed anatomy exam, the biophysical profile. The physician can only interpret what was captured, so the protocol matters as much as the machine. A read partner should give you a written protocol and a worksheet for each exam type it reads.

The detailed anatomy exam (CPT 76811) deserves its own caution. It isn’t a premium version of the anatomy scan that a practice decides to offer. It’s indicated for specific higher-risk situations, and it carries training expectations for both the person scanning and the physician reading. Read what the detailed anatomy scan covers before you put it on a price list.

A physician qualified to read the study

A sonographer acquires the images and can record technical findings. The diagnostic interpretation and the signed report belong to a qualified physician. For obstetric studies that is usually a radiologist with obstetric imaging experience, an OB/GYN, or a maternal-fetal medicine physician. AIUM publishes training guidelines for physicians who interpret ultrasound, built around board certification, subspecialty certification such as maternal-fetal medicine, and case volume. Who reads OB ultrasounds covers the differences, and when subspecialist interpretation matters most.

Licensure comes first. In almost every case the physician interpreting a study needs a license in the state where the patient is scanned, so ask any read partner about your states before anything else. Then ask these:

• Who reads the studies, and what is their specialty?
• What is the turnaround for a routine study and for an urgent one, and is it in writing?
• How does a finding that needs action reach the ordering clinician?
• Does it work with the PACS you have, or do you move to theirs?
• What is the pricing model: per study or per month, and are there setup fees or a minimum volume?
• Can you see a sample report?

Images: a PACS and a way to send studies

Your machine has to export studies in DICOM format, and the studies have to land somewhere the reading physician can open them. Most small practices use a cloud PACS or an image-sharing platform for this. Tricefy, ViewPoint and Studycast are common in obstetric imaging. The worksheet with your measurements travels with the images. For the clinic-side view of the same workflow, see how remote ultrasound reads work for a clinic.

Test the export before you schedule patients. It’s rarely difficult, but it’s the step that sets your go-live date. Once you’re handling diagnostic studies you’re handling medical records, so use a PACS vendor that will sign a business associate agreement, and ask your attorney what HIPAA requires of your practice.

The report: what comes back, and how fast

A final report typically names the patient and the ordering clinician, states the exam performed and the reason for it, gives the findings and measurements, and ends with the physician’s impression and signature. It goes to the ordering clinician and into the patient’s record. AIUM’s accreditation standard asks that the final report be signed and available within two business days. A read partner should commit to its own turnaround in writing, with a separate number for urgent studies, and should be able to tell you how an urgent finding reaches the ordering clinician.

Billing: who bills, and what the read costs you

There are two common arrangements. In one, you bill the payer or the patient for the study and pay the reading physician a flat fee per study. In the other, the reading group bills the payer itself for its interpretation. Know which one you’re signing, because it changes what you can charge and what you owe.

If you plan to bill insurance, enrollment is its own project. Medicare, for example, enrolls an independent imaging provider as an independent diagnostic testing facility, which can be a fixed site or a mobile one. The rule requires a supervising physician, technicians who are licensed or certified, and a written order from the treating practitioner for every test. Medicaid programs and commercial plans set their own requirements, and some ask for accreditation. Confirm each payer’s rules with your biller before you scan a patient you intend to bill for.

If you’re cash-pay, a flat per-study cost makes your own pricing simple to work out.

Do you need a medical director?

It depends on your state, the payers you bill and whether you seek accreditation, and it’s a different role from the ordering clinician and the reading physician. We answer it separately: Does an ultrasound business need a medical director?

Switching read partners

Plenty of practices already send diagnostic studies to a teleradiology group and want a different reader. Before you move, get the new partner’s turnaround in writing, find out who signs the reports and what their specialty is, confirm your PACS carries over, and ask what happens to studies that are in flight on the day you switch. Check your current contract for its notice period.

How to start a mobile OB ultrasound business: the clinical side

If you don’t have a business yet, the order of work matters more than any single piece. Start with a healthcare attorney in your state, because rules on who can own a practice that provides medical services vary. Line up ordering relationships next. Then choose a machine that exports DICOM and a PACS to receive the studies, and get your protocols and your reading physician in place together, since one depends on the other. Arrange liability coverage for diagnostic work. Enroll with payers only if you plan to bill them. Begin with a handful of studies a week, and add volume once reports are coming back on schedule.

This guide covers the clinical side. It isn’t a business plan, and it isn’t legal advice.

Where Ouma fits

Ouma is the reading physician in this picture. Board-certified maternal-fetal medicine physicians read each study and return a signed report within 24 business hours, or within two hours for a STAT read at no extra charge, for a flat fee per study with no setup fee, subscription or minimum volume. We ask that every diagnostic study carry an order from a licensed clinician who will manage the result, and we don’t read keepsake-only scans or act as the ordering clinician. Ouma is licensed to practice in all 50 states.

See how OB ultrasound reads work · Request a rate sheet

Before your first diagnostic OB scan: a checklist

1. A healthcare attorney has confirmed how your state treats ownership, licensure and any director requirement.
2. At least one licensed clinician will order your studies and manage abnormal results.
3. Your sonographer holds the right credential for obstetric scanning.
4. You have a written protocol and worksheet for every exam type you offer.
5. A qualified physician, licensed where your patients are scanned, will interpret each study.
6. Turnaround for routine and urgent studies is in writing, along with how urgent findings are communicated.
7. Your machine exports DICOM, and a test study has reached the reader through your PACS.
8. You know what a final report looks like and where it will be filed.
9. Your liability coverage includes diagnostic work.
10. If you bill insurance, each payer’s enrollment requirements are met.

Frequently asked questions

I run an elective studio. What changes when I add diagnostic scans?

A diagnostic scan is a medical test. It needs an order from a licensed clinician, a credentialed sonographer working to a protocol, a qualified physician to interpret it and a signed report that goes to the ordering clinician. Your consent forms, liability coverage and marketing language also need to reflect medical work, and your state may have rules of its own.

Do I need an ordering clinician or a medical director?

You need an ordering clinician. Payers generally expect an order, and someone local has to manage an abnormal result. A medical director is a separate role, and whether you need one depends on your state, the payers you bill and whether you seek accreditation.

Can a sonographer read their own scans?

No. A sonographer acquires the images and can record technical findings, but the diagnostic interpretation and the signed report come from a qualified physician.

Does the reading physician need a license in my state?

In almost every case, yes. The physician interpreting a study generally needs a license in the state where the patient is scanned, so ask a read partner about your states first. Ouma is licensed to practice in all 50 states.

How long does a read take?

It depends on the reader. AIUM’s accreditation standard asks for a signed final report within two business days. Ouma returns routine reads within 24 business hours and STAT reads within two hours, at no extra charge.

What’s the difference between an overread and an interpretation?

People use the words loosely. Strictly, an interpretation is the primary read that produces the signed report, and an overread is a second physician’s review of a study that already has one. Many imaging providers say overread for any read done by an outside physician.

Can I start with a few studies a month?

With Ouma, yes. There’s no minimum volume, no setup fee and no subscription.

Sources

• U.S. Food and Drug Administration. Ultrasound Imaging. Content current as of September 19, 2024. fda.gov
• American Institute of Ultrasound in Medicine. Prudent Use and Safety of Diagnostic Ultrasound in Pregnancy. Approved May 19, 2020. aium.org
• American Institute of Ultrasound in Medicine. Standards and Guidelines for the Accreditation of Ultrasound Practices. Reapproved April 20, 2026. aium.org
• American Institute of Ultrasound in Medicine. Training Guidelines for Physicians Who Evaluate and Interpret Diagnostic Ultrasound Examinations. Revised November 17, 2025. aium.org
• 42 CFR 410.32, Diagnostic x-ray tests, diagnostic laboratory tests, and other diagnostic tests: Conditions. ecfr.gov
• 42 CFR 410.33, Independent diagnostic testing facility. ecfr.gov
• Society of Diagnostic Medical Sonography. Mandated state licensure. sdms.org
• Inteleos (ARDMS). Obstetrics and Gynecology examination. inteleos.org

This guide is general information, not legal, billing or medical advice. Rules differ by state and by payer. Confirm yours before you begin. CPT is a registered trademark of the American Medical Association.