| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Renin challenge tests | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  | 
| Renin, low salt intake measurement, upright, 4 hours | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  | 
| Renin, low salt intake measurement, recumbent, 6 hours | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  | 
| Renin, normal salt intake measurement, recumbent, 6 hours | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  | 
| Renin, normal salt intake measurement, upright, 4 hours | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  | 
| Serum renin activity measurement | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  | 
| Plasma renin level | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  | 
| Aldosterone and renin measurement following saline suppression | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  | 
| Renin activity measurement | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  | 
| Renin ambulant measurement | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  | 
| Renin recumbent measurement | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  | 
| Aldosterone/renin ratio | Is a | True | Renin measurement | Inferred relationship | Existential restriction modifier |  |