| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Porphyrin measurement, fecal, qualitative or semi-quantitative | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Porphyrins, qualitative measurement, urine | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Tetracarboxylporphyrin measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Mono-carboxylic porphyrin measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Dicarboxylporphyrin measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Tricarboxylporphyrin measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Pentacarboxylporphyrin measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Hexacarboxylporphyrin measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Octacarboxylporphyrin measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Deuteroporphyrin measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Mesoporphyrin measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin, quantitative measurement, urine | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, total, plasma | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Uroporphyrin measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, 24-hours, feces | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Coproporphyrin III measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Measurement of urine coproporphyrin isomers series I and III | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, fractionation, erythrocytes | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Coproporphyrin I measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, feces, quantitative | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Urine heptaporphyrin concentration measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Uroporphyrin I measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Uroporphyrin III measurement | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Heptaporphyrin concentration measurement | Is a | True | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin studies | Is a | True | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Heptaporphyrin level | Is a | True | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Hexaporphyrin level | Is a | False | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Isocoproporphyrin level | Is a | True | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Pentaporphyrin level | Is a | True | Porphyrin screening | Inferred relationship | Existential restriction modifier |  | 
| Uroporphyrin level | Is a | True | Porphyrin screening | Inferred relationship | Existential restriction modifier |  |