Class 0: Negative (< 0.10 kU/L)
Class 0/1: Borderline/equivocal (0.10 kU/L – 0.34 kU/L)
Class 1: Equivocal (0.35 kU/L – 0.69 kU/L)
Class 2: Positive (0.70 kU/L – 3.49 kU/L)
Class 3: Positive (3.50 kU/L – 17.4 kU/L)
Class 4: Strongly positive (17.50 kU/L – 49.9 kU/L)
Class 5: Strongly positive (50.0 kU/L – 99.9 kU/L)
Class 6: Strongly positive (≥ 100 kU/L)
Reference values apply to all ages.