A preliminary radiology read is a rapid initial interpretation issued to guide immediate care decisions before the official report exists; a final read is the complete, signed report of record from a board-certified radiologist, and it is the only version that is billable and legally definitive. STAT is not a report type at all: it is an urgency tier, meaning the study must be read immediately, and a STAT study can be delivered as either a preliminary or a final report. Peer-reviewed literature puts the major discrepancy rate between preliminary and final interpretations at roughly 2.6 percent, which is why the industry has been moving toward final reads from the first interpretation, even overnight.
If your team still treats "STAT," "prelim," and "final" as interchangeable, this guide separates the three cleanly, walks through the discrepancy and billing evidence, and explains when a preliminary workflow still earns its keep.
STAT describes urgency. Preliminary and final describe report status.
The confusion between these terms comes from mixing two independent axes. One axis is how fast the answer is needed. The other is whether the report is the official record.
| Term | What it describes | Typical use | Superseded later? |
|---|---|---|---|
| STAT | Urgency: read immediately | Stroke protocol CT, trauma, suspected PE, acute abdomen | No. STAT is a priority label, not a document |
| Preliminary read | Report status: initial, unsigned or provisionally signed impression | Overnight coverage models where the local group finalizes in the morning | Yes, always replaced by a final report |
| Final read | Report status: complete, signed report of record | Every study, eventually. The billable interpretation | No. This is the document of record |
A STAT study can receive a preliminary report, a final report, or both in sequence. A routine outpatient MRI can go straight to final with no preliminary step at all. The two vocabularies are orthogonal, and contracts that blur them create real operational surprises: a vendor promising "STAT reads in 30 minutes" may be promising a preliminary impression, with the signed final report arriving hours later from a different physician.
When you evaluate a teleradiology contract, ask two separate questions for every tier: how fast does the report arrive, and is it final when it arrives? A useful clarifying question is who signs the report of record and when. If the answer involves a second physician the next morning, you are buying preliminary coverage regardless of what the tier is called.
A third term you will still hear is the wet read. It dates to the film era, when a radiologist gave an impression while the X-ray film was literally still wet from the developer. In modern usage it is a synonym for a rapid preliminary read, most often in the ED. If a referring physician asks for a wet read, they are asking for a fast first impression, not the report of record.
How often do final reads change preliminary findings?
This is the question that determines whether a preliminary workflow is acceptable risk or hidden liability, and the peer-reviewed answer is consistent: major discrepancies between preliminary and final interpretations run in the range of 2 to 3 percent, with approximately 2.6 percent the figure most frequently cited in the peer-reviewed literature on preliminary-to-final report changes.
Put concretely, that is roughly 1 in 40 preliminary reports revised in a way that can affect patient management. In an emergency department reading 100 overnight studies, the morning overread cycle surfaces two to three clinically meaningful changes, each of which may require a callback, an amended plan, or a patient who has already been discharged on the wrong assumption.
Two things are worth noting about that evidence base.
- Much of the discrepancy literature studies resident preliminary reads finalized by attendings, which is the classic academic overnight model. Discrepancy rates for experienced teleradiologists issuing preliminaries tend to be lower, but the structural problem remains: any two-step interpretation model produces a window in which care proceeds on a report that may change.
- The widely cited public content on this topic dates to the early 2010s. The workflow it describes, overnight preliminaries finalized by the day group, is no longer the default. Final-read overnight coverage is now standard among quality-focused teleradiology providers, precisely because it closes the discrepancy window entirely.
For comparison, AstraRad issues final reads from the first interpretation and independently double-reads 1 in 20 reports through a blinded QA program. Our audited major discrepancy rate is under 0.3 percent trailing twelve months, roughly an order of magnitude below the published preliminary-to-final range. The methodology behind that number is published on our SLA and quality page.
Billing and liability: why the final read is the report of record
The distinction between preliminary and final is not academic. It determines who gets paid and who carries the risk.
Billing. Under Medicare rules and most commercial payer policies, the professional component of an imaging study is billed by the physician who renders the complete, signed interpretation. A preliminary read is generally not separately billable. In a preliminary-plus-overread model, you are paying for two radiologist touches on every study while generating one billable event, and the overnight preliminary fee is pure cost. CMS guidance on interpretation billing is summarized in the Medicare Claims Processing Manual maintained by CMS.
Liability. The final report is the legal document of record. When a preliminary and final disagree, the discrepancy itself becomes discoverable evidence, and the interval between the two reports is the period in which the patient was managed on information that the record later contradicted. Closing that interval to zero, by making the first interpretation the final one, is the cleanest risk posture available.
Accountability. A final-read model also gives you one accountable physician per study. In a two-step model, responsibility is split between the preliminary reader and the finalizing radiologist, which complicates peer review, discrepancy tracking, and credentialing files.
When do preliminary reads still make sense?
Preliminary workflows are not obsolete. There are specific situations where they remain the right tool.
- Academic training programs. Resident preliminary reads with attending finalization are how radiologists learn. The discrepancy cycle is a feature of education, backed by structured overread and feedback.
- Internal group workflows. A group that wants its own radiologists to finalize everything for continuity or credentialing reasons may intentionally buy preliminary overnight coverage and finalize in-house each morning.
- Instant provisional answers ahead of a fast final. In hyperacute settings, a verbal impression to the ED within minutes, followed by the signed final shortly after, combines speed with a closed record. This is a sequencing choice, not a reason to leave studies unfinalized overnight.
Outside those cases, a preliminary-plus-overread pipeline usually just doubles the work: two radiologist reads, one billable report, a morning finalization queue that consumes your day team's first hours, and a standing 2 to 3 percent revision rate to manage. For most imaging centers, hospitals without residency programs, and radiology groups buying nighthawk coverage, final reads from the first interpretation are simpler, safer, and cheaper per billable report.
How AstraRad delivers final reads at every tier
AstraRad issues signed final reports at every priority tier, around the clock. There is no preliminary layer to reconcile and no morning overread queue.
| Priority tier | Turnaround SLA | Report type |
|---|---|---|
| STAT | Under 1 hour, 28-minute median | Signed final report |
| Urgent | Under 4 hours | Signed final report |
| Routine | Under 24 hours | Signed final report |
The numbers behind that table: 240 board-certified, fellowship-trained subspecialists reading 600,000 studies per year across 12 time zones, with 99.4 percent SLA compliance over the trailing twelve months. A 2 a.m. stroke protocol CT gets a STAT CT final read from a neuroradiologist, not a generalist prelim, with the same sub-30-minute median turnaround as a 2 p.m. study. Coverage spans CR X-ray, ultrasound, mammography, CT including coronary CTA, MRI including cardiac, nuclear medicine, and PET-CT, routed to the matching subspecialist in neuro, MSK, body, cardiac, breast, pediatric, chest, ER, oncologic, or nuclear imaging.
Quality is enforced the same way at every tier: 1 in 20 reports is independently double-read, and the audited major discrepancy rate is under 0.3 percent. Studies arrive by DICOM from your PACS or through portal upload, with no integration project required, and results deliver via HL7 or FHIR. The platform is HIPAA and GDPR compliant and DICOM conformant.
Pricing is per report with no minimums, no subscriptions, and no platform fees. Priority pricing is a printed multiplier on the rate card, so the cost of a STAT final read versus a routine one is visible before you send your first study. Send one study a month or ten thousand. Request a rate card through our contact page and you will have it within one business day; the model itself is explained on our pricing page.
If you are still comparing coverage models, start with our plain-language explainer on what teleradiology is and how it works, then hold any vendor you evaluate to the same standard: signed final reports at every tier, a published SLA, and a discrepancy rate they are willing to put in writing.