| Outbound Relationships | Type | Target | Active | Characteristic | Refinability | Group | Values | 
| Serum pro-brain natriuretic peptide level | Is a | Brain natriuretic peptide measurement | true | Inferred relationship | Existential restriction modifier |  |  | 
| Serum pro-brain natriuretic peptide level | Method | Evaluation - action | false | Inferred relationship | Existential restriction modifier |  |  | 
| Serum pro-brain natriuretic peptide level | Component | Pro-brain natriuretic peptide | true | Inferred relationship | Existential restriction modifier | 2 |  | 
| Serum pro-brain natriuretic peptide level | Has specimen | Serum specimen | true | Inferred relationship | Existential restriction modifier | 1 |  | 
| Serum pro-brain natriuretic peptide level | Component | Brain natriuretic peptide | true | Inferred relationship | Existential restriction modifier | 3 |  | 
| Serum pro-brain natriuretic peptide level | Is a | Measurement of substance in specimen | false | Inferred relationship | Existential restriction modifier |  |  | 
| Serum pro-brain natriuretic peptide level | Method | Measurement - action | true | Inferred relationship | Existential restriction modifier | 4 |  | 
| Serum pro-brain natriuretic peptide level | Is a | Measurement of level of drug in blood | false | Inferred relationship | Existential restriction modifier |  |  | 
| Serum pro-brain natriuretic peptide level | Is a | Measurement of level of substance in blood | true | Inferred relationship | Existential restriction modifier |  |  | 
| Serum pro-brain natriuretic peptide level | PBCL flag true | PBCL flag true: report, request, level, test | false | Additional relationship | Existential restriction modifier |  |  | 
| Serum pro-brain natriuretic peptide level | PBCL flag true | PBCL flag true: report, request, level, test | false | Additional relationship | Existential restriction modifier |  |  | 
| Serum pro-brain natriuretic peptide level | PBCL flag true | PBCL flag true: report, request, level, test, text, boolean | false | Additional relationship | Existential restriction modifier |  |  |