Table 1.

Newborns with false-positive reduced IDUA enzyme activity.

Newborn	Sex	Delay in analysis	IDUA enzyme activity (cut-off > 1.5 μmol/L/h)	IDUA genetic testing
1	M	9 weeks 4 days	1.2	Negative
2	M	7 weeks 4 days	0.7	Negative
3	M	6 weeks 5 days	0.9	Negative
4	M	6 weeks 3 days	0.4	Negative
5	M	5 weeks 6 days	1.3	Negative
6	M	8 weeks 3 days	0.8	Negative
7	M	9 weeks 3 days	0.5	Negative
8	M	7 weeks 4 days	1.2	Negative
9	F	6 weeks 3 days	1.5	Negative
10	M	7 weeks 5 days	1.3	Negative
11	F	6 weeks 3 days	0.7	Negative
12	F	7 weeks 1 days	0.7	Negative
13	F	10 weeks 2 days	1.3	Negative
14	F	7 weeks	1.0	Negative
15	F	7 weeks 3 days	0.8	Negative
16	F	6 weeks 1 day	0.9	Negative
17	F	9 weeks 4 days	1.1	Negative
18	F	9 weeks 2 days	0.5	Negative
19	F	8 weeks	1.0	Negative
20	F	8 weeks 3 days	0.6	Negative

F, female; M, male.