| Source Element | Usage | Target |
| SubstanceAmount | UseExtension | http://hl7.org/fhir/4.0/StructureDefinition/extension-SubstanceAmount |
| SubstanceAmount.id | UseExtensionFromAncestor | - |
| SubstanceAmount.extension | UseExtensionFromAncestor | - |
| SubstanceAmount.modifierExtension | UseExtensionFromAncestor | - |
| SubstanceAmount.amount[x] | UseExtensionFromAncestor | - |
| SubstanceAmount.amountType | UseExtensionFromAncestor | - |
| SubstanceAmount.amountText | UseExtensionFromAncestor | - |
| SubstanceAmount.referenceRange | UseExtensionFromAncestor | - |
| SubstanceAmount.referenceRange.id | UseExtensionFromAncestor | - |
| SubstanceAmount.referenceRange.extension | UseExtensionFromAncestor | - |
| SubstanceAmount.referenceRange.lowLimit | UseExtensionFromAncestor | - |
| SubstanceAmount.referenceRange.highLimit | UseExtensionFromAncestor | - |