There may be other metal abnormalities, these reflect the poor digestive function and will come back to normal fairly quickly. No samples are taken for Vitamin levels or folate, since this requires a blood sample to be taken. The principal has to be non invasive whenever possible. This has the advantage that Lead, Cadmium and Mercury levels can also be estimated. All these can produce brain functional changes directly or indirectly.
Replacement is only on an indicated basis.
Many children have occult Zinc deficiency and this may be masked in an otherwise normal hair sample. These are well recognised in autism. It is found that when the diet and digestive tract are attended to, sensitivities will in general disappear. Previously reactive foods can be reintroduced. Some children do remain sensitive.