From: A comparison of diagnostic tests for lactose malabsorption - which one is the best?
Variable | Normal value | Sensitivity | Specificity | PPV | NPV | Accuracy | LR + | LR- |
---|---|---|---|---|---|---|---|---|
H2 + CH4x2 | <53 ppm | 44.4% | 100% | 100% | 92.4% | 92.9% | Inde-finite | 0.56 |
H2 + CH4x2 | <18 ppm | 100% | 90.2% | 60% | 100% | 91.4% | 10.2 | 0 |
H2 + CH4 | <17 ppm | 88.9% | 91.8% | 61.5% | 98.2% | 91.4% | 10.8 | 0.12 |
H2 | <16 ppm | 77.8% | 93.4% | 63.6% | 96.6% | 91.4% | 11.9 | 0.24 |
s-glucose-increase | >0.9 mmol/L | 77.8% | 93.4% | 63.6% | 96.6% | 91.4% | 11.9 | 0.24 |
Any symptom-ELL | Absent | 85.7% | 78.4% | 35.3% | 97.6% | 79.3% | 4.0 | 0.18 |