These two roles get used interchangeably in conversation far more often than they should. They are governed by different disclosure rules, priced differently, and require a different conversation with the consultant before work begins.
A consulting legal nurse consultant works behind the scenes: reviewing records, building chronologies, and helping counsel understand the medicine. That work product is typically protected from disclosure to opposing counsel, similar to other work-product materials. A testifying expert's opinions, materials reviewed, and often their compensation become discoverable once they are designated — under Federal Rule 26 and equivalent state rules — and they are subject to deposition and cross examination.
Practical note: a consultant can sometimes convert to a testifying expert on the same case, but that conversion should be a deliberate decision made with counsel, not an assumption made after months of consulting work. Once designated, prior consulting communications may become subject to different discovery treatment depending on jurisdiction.
The most common friction point is not the distinction itself — it is deciding late. Clarifying which role is needed at intake, rather than midway through a case, avoids both unnecessary disclosure exposure and the scramble of finding a new testifying expert under time pressure.
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