August 13, 2026 · 2 min
The Nervoscope: How Instrumentation Helps Locate Nerve Irritation
By Dr. Will Bartlett
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Two of the five steps in a Gonstead exam are things you can't see with the naked eye or feel with your hands alone: instrumentation and X-ray analysis. Instrumentation is where the Nervoscope comes in.
The instrument has two temperature sensors that glide along either side of the spine simultaneously, comparing paraspinal skin temperature at each level — sometimes called a Delta-T reading. Nerve irritation can affect local blood flow and, in turn, skin temperature, so a consistent side-to-side difference at a specific level is a data point worth investigating further with palpation and X-ray.
It's not a diagnostic tool on its own. On its own, a temperature difference just tells you where to look closer — it doesn't tell you why. That's why Gonstead technique treats instrumentation as one of five required pieces of information, not a shortcut that replaces palpation or imaging. A finding has to show up consistently across multiple parts of the exam before it becomes the basis for an adjustment.
Instrumentation is also used at every visit, not just the first one, because it's a fast, non-invasive way to re-check the spine and see whether an area that was irritated at the last visit has actually settled down. That's part of what "full exam every visit" means in practice — not a slogan, but a specific set of repeatable checks.
Read more: the Gonstead exam process, your first visit.
Frequently asked questions
Does the Nervoscope hurt?
No — it's a light, gliding instrument with no needles, pressure, or electrical stimulation involved.
Is a Nervoscope reading used by itself to decide on an adjustment?
No. It's one of five pieces of exam information — visualization, instrumentation, static palpation, motion palpation, and X-ray — that need to align before a specific adjustment is made.
Do you use it at every visit?
Yes. Instrumentation is part of the re-exam performed at each visit, not just the initial one.
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