Ulnar nerve at the elbow – normative nerve conduction study

Table 2 Shows descriptive statistics for the parameters of motor conduction of the UNE, recorded from ADM and from FDI

Ulnar motor nerve conduction parameters	Recorded from ADM, dist. 8 cm		Recorded from FDI, dist. 13 cm
Parameter	Mean [SD]	Reference range for 95% tolerance interval	Mean [SD]	Reference range for 95% tolerance interval
DML wrist [ms]	2.8 [0.3]	2.2-3.4	3.4 [0.4]	2.4-4.3
MNCV forearm [m/s]	60.4 [5.2]	49.6-71.1	59.7 [4.7]	49.8-69.6
MNCV elbow [m/s] ADM	57.1 [5.9]	44.8-69.3	56.5 [5.7]	44.5-68.5
MNCV forearm – over the elbow [m/s]	3.3 [6.6]	−10,5-17,1	3,2 [6.4]	−10,2-16,5
Amp-CMAP wrist [mV]	9.6 [2.3]	4.9-14.4	12,0 [4.0]	3.5-20.4
Amp-CMAP BE [mV]	9.4 [2.1]	5.0-13.8	11.4 [3.9]	3.3-19.5
Amp-CMAP AE [mV]	9.2 [2.0]	5.1-13.3	11.4 [3.8]	3.5-19.3

Limits of reference range for each parameter were calculated as 2.5^th and 97.5^th percentile, respectively,. The lower limit of the reference interval for motor nerve conduction velocity (MNCV) of the UNE measured to ADM was 51.0 m/s at the forearm and 45.5 m/s across the elbow. The upper limit for the distal motor latency was 3.4 ms over the distance of 8 cm, the lower limits for CMAP recorded from ADM with stimulation points at the wrist, below the elbow (BE), and above the elbow (AE) were 5.6 mV, 5.8 mV, and 5.9 mV, respectively. The lower limit of that interval for MNCV measured to FDI at the forearm was 50.6 m/s, and 45.5 m/s across the elbow. The upper limit for the distal motor latency was 4.3 ms. The lower limits for CMAP recorded from FDI with stimulation points at the wrist, BE, and AE were 5.2, mV, 5.2 mV, and 5.6 mV, respectively.