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Predictive values of hypomagnesemia for HNF1B mutation
| Age (yr) | Positive predictive value | Negative predictive value |
|---|---|---|
| 0–4.5 | 0.6 | <0.5 |
| 4.5–9.0 | 0.5 | <0.5 |
| 9.0–13.5 | 0.7 | 0.9 |
| 13.5–18.0 | 0.7 | 0.9 |
Shown are the positive and negative predictive values for hypomagnesemia and HNF1B mutation. Note, absence of hypomagnesemia in the second half of childhood is highly predictive of not having an HNF1B mutation in patients with renal tract malformations.
