Reporting, Measurements, and Critical Findings

Quick Answer: Reports need indication, biometry + %iles, anatomic checklist, limitations. Critical findings = immediate read-back. Use standard caliper rules. Incomplete ≠ normal—list missing views.

Professional Report Structure

1. Demographics and gestational age (state dating source: CRL, LMP, prior scan)
2. Clinical indication
3. Technique (TA/TV/Doppler; limitations if any)
4. Systematic findings (biometry with percentiles, anatomic survey checklist)
5. Impression (concise synthesis)
6. Recommendations (follow-up interval, referrals)

Structured templates matching AIUM checklists reduce omission errors on QA audits.

Measurement Standards (Registry High-Yield)

Inconsistent technique on serial scans creates false growth restriction or false reassuring trends.

Worked Scenario: AC Percentile Drop

Prior study AC 50th percentile; current AC 8th percentile with normal UA Doppler. Report must state decline in AC percentile and recommend 2–3 week follow-up or additional testing—not silent "normal growth."

Critical Results Communication

Findings requiring immediate direct physician notification with read-back documentation:

Document who was called, time, read-back confirmation, and sonographer identity per facility policy. Many hospitals target contact within 30 minutes of identification.

Incomplete Examination Language

Acceptable: "Fetal cardiac outflow tracts and three-vessel trachea view not visualized due to spine posterior position; recommend repeat imaging in 2 weeks or MFM referral."

Unacceptable: "Normal complete fetal survey" when mandatory cardiac views missing.

Incomplete ≠ normal. List each missing component and medical necessity for follow-up.

Comparison to Prior Studies

Explicit trend statements improve care and medicolegal clarity:

"Compared to study dated [date], AC percentile decreased from 40th to 8th; EFW remains 25th percentile."

Note placenta migration, cyst size change, cervical length trend.

Placenta and Previas Reporting

State distance of placental edge from internal os in millimeters. Do not write "complete previa" if edge does not cover os—use low-lying or marginal per distance criteria.

Laterality and Labeling

Confirm uterine position before assigning left/right ovary—wrong-side labeling is medicolegal risk. In twins, fetus A/B labels consistent across images and report.

Amendment vs Addendum Policy

When retrospective error discovered, issue addendum explaining correction—never silent overwrite of archived report or PACS deletion.

Growth Velocity and Percentiles

Report each biometric percentile and EFW percentile with formula name if required. Velocity across 2–3 weeks more meaningful than single borderline percentile.

Liability and Language

Quantify findings in millimeters (cervix, endometrium, masses). Avoid excessive "rule out" hedging; state objective findings and limitations.

QA Metrics

Peer review compares image completeness to report claims—sonographer image labels support QA scoring.

Exam Traps

• EFW reported without percentile or GA source
• Critical finding communicated next day by routine fax
• Late third-trimester single BPD used to re-date pregnancy
• "Normal" when incomplete cardiac survey
• Omitting comparison to prior when serial growth assessed

Reporting items reward professional communication standards—the correct answer is often what AIUM and department policy require, not creative prose.

AIUM Practice Parameter Alignment

Reports should reflect AIUM obstetric and gynecologic practice parameters: mandatory anatomic components, biometry with percentiles, placental location, fluid assessment, and limitations. Incomplete study language matches AIUM expectation that limitations are explicit and follow-up recommended when views not obtained.

Structured Impression Writing

Impression synthesizes critical positives first, then normal variants, then limitations. Example structure: (1) growth pattern, (2) anatomic survey completeness, (3) placenta/fluid, (4) recommendations. Avoid burying previa or major anomaly below normal findings.

Biometry Reporting Template

Document each parameter with measurement in mm, gestational age equivalent, and percentile. State EFW formula if required by department. Example: "AC 280 mm (31 weeks 4 days, 8th percentile); EFW 1650 g (Hadlock, 12th percentile)." Discrepant parameters (HC 50th, AC 5th) require explicit comment.

Cervical Length Reporting

TV cervical length in millimeters with funneling description if present. Short cervix (<25 mm) before 24 weeks in high-risk screening prompts intervention discussion—report measurement, do not diagnose cerclage indication alone. Dynamic shortening with probe pressure documented if observed.

Gynecologic Critical Findings

Same read-back documentation standards as obstetric critical results.

Peer Review and Quality Assurance

QA programs compare stored images to report claims. Sonographer labels on images (plane, caliper type) support audit. Discrepancy between image and report is reportable event—registry tests professional responsibility for accuracy over speed.

Medicolegal Language

State objective findings in millimeters. "Cannot exclude" acceptable for limitations; "Normal complete exam" unacceptable when views missing. Comparison to prior studies reduces ambiguity in growth and mass surveillance.

Comparison Statements

Explicit comparison to prior studies improves care: "AC percentile decreased from 40th to 8th since [date]." Note placental migration, cyst size change, and cervical length trends when serial imaging performed.