Table 1.

Sensitivity and specificity of the spot urinary 5-HIAA at different cut-off levels for the assessment of 5-HIAA, using the 5-HIAA measured in the 24-h urine collection as reference method (ULN 40 µmol/24).

Cut-off value of spot urine 5-HIAA	Sensitivity (%)	Specificity (%)
(A)
1.95	100	28
3.3	95	75
3.5	89	80
4.2	85	87
5.3	83	95
5.7	80	97
8.7	70	98
18.2	42	100
(B)
1.95	100	24
3.3	94	69
3.5	89	75
4.2	86	82
5.3	85	94
5.7	83	96
8.7	67	98
18.2	38	100

(A) Sensitivity and specificity results of the analysis of the total number of urinary 5-HIAA measurements (136). (B) Sensitivity and specificity results of the analysis of urinary 5-HIAA measurements in the group of patients with NEN (100).