Questions to Ask an OB/GYN Expert Witness at Deposition (2026 Guide)

By John Mahoney · Updated 2026-09-01 · 18 questions in 4 concession chains

You are about to cross-examine someone with two decades of training you don't have, on their home turf, about the thing they do every day. That asymmetry is the defining problem of medical-expert depositions — and it gets worse in multi-defendant malpractice cases, where two to four different specialties can be in play in a single case and you have to be conversant in all of them by deposition day.

OB/GYN experts dominate birth-injury litigation — fetal-monitoring interpretation, the decision-to-delivery sequence, and shoulder-dystocia management. They are among the most deposition-hardened experts in medicine, and the strips are usually the whole case. The funnel has to lock their reading of the objective tracing before any argument about response.

The answer to the asymmetry is not to learn ob/gyn — it is structure. A concession funnel asks the expert to agree, one fact at a time, to propositions so orthodox that refusing them costs more credibility than granting them. The questions below are a generic-case-safe starting bank, organized into the four chains that structure works through.

How to use these questions

Every question below follows three rules of expert cross-examination: it is leading (it states a fact and asks for agreement), it contains one fact (no compounds — a compound question lets the witness answer the easy half), and it belongs to a concession chain (each answer narrows the room the next answer can live in). Ask them in order. When you get the concession, stop — do not ask the "why" question that lets the expert explain it away.

Chain 1 — Qualifications, retention & scope

Goal: establish on the record that this is a paid, retained witness who never touched the patient, and fix the boundaries of what they actually practice.

Doctor, you were retained by opposing counsel in this case, correct?
You are being compensated for your time reviewing this case and for your testimony today, correct?
You never examined or treated the patient in this case, correct?
Everything you know about this case comes from the materials counsel selected and sent to you, correct?
You agree the American College of Obstetricians and Gynecologists publishes practice guidance that practicing obstetricians widely consult, correct?

Chain 2 — Bases-of-opinion lockdown

Goal: freeze the universe. After this chain, any new document, new basis, or new opinion at trial is impeachment material.

You have now told us every document and material you reviewed in forming your opinions, correct?
You are not relying on anything outside that file for the opinions you will give in this case, correct?
You have told us every opinion you intend to offer at trial, correct?
You agree that an opinion you cannot state to a reasonable degree of medical probability is speculation, correct?

Chain 3 — Substantive concessions: fetal monitoring and the response to it

In most OB cases the electronic fetal-monitoring strips are objective, contemporaneous, and un-editable. The funnel below makes the expert commit to what monitoring is for and what a concerning tracing demands — before anyone argues about what this tracing showed.

Electronic fetal monitoring exists to detect signs that a fetus may not be tolerating labor, correct?
There is a standard, widely used system for categorizing fetal heart-rate tracings, correct?
A concerning tracing calls for evaluation, correct?
A concerning tracing that does not improve calls for a response, correct?
When continuing labor becomes unsafe for the fetus, cesarean delivery is the alternative, correct?
The monitoring strips in this case are objective, contemporaneous records — they are what they are, correct?

Chain 4 — Closing the doors

Goal: end with the record sealed. These questions convert silence into a commitment that nothing new is coming at trial.

You are not offering any opinions in this case beyond the ones we have discussed today, correct?
You have not held back any opinion or criticism that you intend to offer at trial, correct?
You are not offering any opinion about the pediatric or neonatal resuscitation care after delivery, correct?

These are the generic questions. Your case isn't generic.

The MedLegal AI Examination Builder generates a complete, case-specific concession-funnel roadmap for deposing an ob/gyn expert — built from your theory of the case, aware of which side you're on and what kind of witness you're facing, with stop markers, if-they-resist branches, and the doors you should not open. Three free cases, no credit card.

Build my examination → OB/GYN depo trainer

Where lawyers get burned deposing ob/gyn experts

Arguing the strips before pinning the expert’s categorization

If you debate what the tracing shows before the expert commits to a category and a time, they will re-interpret it fluidly all deposition long. Pin the categorization strip-by-strip and hour-by-hour first. Every later argument is then measured against their own sworn readings.

Accepting "maneuvers were performed" without chart support

In shoulder-dystocia cases, experts routinely narrate a textbook sequence of maneuvers. Ask what the chart actually documents, one maneuver at a time. The gap between the narrated sequence and the documented one is often the case.

Leaving the timeline loose before arguing causation

Causation in birth-injury cases is fought in minutes. If you argue injury causation before locking when the tracing became concerning, when the physician was notified, and when delivery occurred, the expert will slide the windows to fit the defense. Timeline first, causation second.

FAQ

What questions should I ask an ob/gyn expert witness at deposition?

Work in four concession chains: (1) qualifications, retention, and scope — establish the expert was retained, is compensated, never treated the patient, and what they do and do not practice; (2) bases-of-opinion lockdown — pin every document reviewed and every opinion they intend to offer; (3) the ob/gyn-specific substantive chain — well-established propositions such as "Electronic fetal monitoring exists to detect signs that a fetus may not be tolerating labor"; and (4) closing the doors — confirm on the record that no undisclosed opinions remain. Every question should be leading, contain one fact, and build on the prior answer.

How do I cross-examine a medical expert when I never went to medical school?

You don't out-doctor the doctor — you build concession chains from propositions so well-established that a credible ob/gyn expert cannot refuse them, then apply those concessions to the facts in the chart. The expert's medical training becomes your asset: the more orthodox the proposition, the more it costs them to fight it. The asymmetry problem is real — especially in multi-defendant cases with two to four specialties — which is why the questions are organized as funnels rather than as debates.

What are the biggest traps when deposing an ob/gyn expert witness?

The classic traps are debating what the fetal-monitoring strips show before the expert has committed to a categorization and a timeline, accepting a narrated sequence of shoulder-dystocia maneuvers that the chart does not document, and arguing causation before the minute-by-minute timeline is locked.

Related resources

Examination Builder — a case-specific concession-funnel roadmap from your theory of the case
OB/GYN deposition trainer — the other side of the table: how ob/gyn witnesses are prepped against these questions
All specialties — deposition question guides
Are you an ob/gyn physician? Join the MedLegal AI expert network

This page is informational only and is not legal advice. Question banks are generic-case-safe starting points — adapt every question to the facts, the jurisdiction, and your theory of the case before using it in a deposition.