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Please assess these nerve conduction study reports
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"carpal tunnel syndrome"[MeSH Terms] AND "nerve conduction"
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AANEM practice parameter electrodiagnostic studies carpal tunnel syndrome median ulnar sensory latency normal values
The report does not include a written “Impression,” so this is an interpretation of the recorded values only. It should be confirmed by the neurologist/physician who performed the study, with your symptoms and examination.
Main findings
| Nerve / side | Key result | Interpretation |
|---|---|---|
| Median motor, left | Distal latency ~3.50 ms; forearm CV ~45.1 m/s | No clear major median motor delay |
| Median motor, right | Distal latency ~3.13 ms; forearm CV ~46.3 m/s | No clear major median motor delay |
| Ulnar motor, left | CV ~51.1 m/s | Within an expected range |
| Ulnar motor, right | CV ~65.7 m/s | Within an expected range |
| Median sensory, left | CV ~58.3 m/s | Preserved |
| Median sensory, right | CV ~59.6 m/s | Preserved |
| Ulnar sensory, right | CV ~60 m/s | Preserved |
| Ulnar sensory, left | CV ~35.8 m/s | Slower than expected / abnormal if technically reliable |
Overall assessment
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No convincing electrophysiological evidence of moderate or severe carpal tunnel syndrome on either side.
- Median motor distal latencies are not markedly prolonged.
- Median sensory responses are present and reasonably fast.
- There is no absent median response or obvious low motor amplitude suggesting significant axonal loss.
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Possible mild left ulnar sensory neuropathy or a technical/temperature-related abnormality.
- The left ulnar sensory study to the little finger has a conduction velocity of about 35.8 m/s, which is substantially slower than the right side (60 m/s) and slower than the left median sensory response.
- However, the left ulnar motor conduction from wrist to elbow is normal (~51 m/s). This pattern can occur with a mild sensory-predominant ulnar problem, but a single abnormal sensory measurement is not enough to firmly localize it, for example to the elbow versus wrist.
- Cold hands, recording conditions, electrode placement, or measurement variability can also slow sensory conduction. The report does not show limb temperature or laboratory reference ranges.
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No clear ulnar motor neuropathy across the elbow is demonstrated by the values shown.
Proper assessment of ulnar entrapment at the elbow generally needs a specifically measured short segment across the elbow, often with comparison of above-elbow and below-elbow velocities. That is not clearly shown here. -
F-wave values alone do not show a clear generalized proximal nerve problem, but the listed F-wave velocities are recorded as 0, likely because limb length/distance was not entered. They are therefore not very useful for interpretation.
Practical meaning
If your symptoms are mainly:
- Thumb, index, middle-finger numbness, worse at night: this study does not strongly support carpal tunnel syndrome, though very mild or intermittent carpal tunnel can sometimes have normal routine nerve studies.
- Ring/little-finger numbness, hand weakness, symptoms with elbow bending or leaning on the elbow: the abnormal left ulnar sensory value could fit a mild left ulnar nerve irritation, but would usually merit correlation with examination and possibly a more targeted ulnar-across-elbow study and needle EMG.
Electrodiagnostic studies support the clinical diagnosis and can sometimes be normal in symptomatic carpal tunnel syndrome, as noted in Bailey and Love's discussion. Comparative median-versus-ulnar sensory testing is commonly used because a side-to-side or same-hand latency difference can be more informative than a single value; the AANEM review considers a median-ulnar sensory latency difference over about 0.4 ms abnormal in a standard ring-finger comparison, but the exact technique and laboratory reference values matter.
Bottom line: the report is broadly reassuring for the median nerves and motor ulnar nerves. The one notable abnormality is slowed left ulnar sensory conduction, which may indicate a mild sensory-predominant left ulnar neuropathy, but needs clinical correlation and may warrant repeat/targeted testing if symptoms persist.
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