| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Bilirubin, non-glucuronidated measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Bilirubin, albumin bound measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Bilirubin measurement, stool, qualitative | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Heptacarboxylporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Indicans measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Indolamine measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Indole measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Porphobilin measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Porphobilinogen measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, fecal, qualitative or semi-quantitative | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Porphyrins, qualitative measurement, urine | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Porphyrins, quantitation and fractionation, urine | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Urobilin measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Tetracarboxylporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Mono-carboxylic porphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Dicarboxylporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Tricarboxylporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Pentacarboxylporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Hexacarboxylporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Octacarboxylporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Deuteroporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Mesoporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Dihydroxy bile acid measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Bilirubin, total measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Bilirubin measurement, amniotic fluid | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Bilirubin measurement, urine | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Fecal stercobilin, qualitative | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin, quantitative measurement, urine | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, total, plasma | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Uroporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Protoporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, 24-hours, feces | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Bilirubin, direct measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Serotonin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, fractionation, erythrocytes | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Coproporphyrin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Fecal urobilin, quantitative | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Urobilinogen measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement, feces, quantitative | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Calculus bilirubin content measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Urine uroporphyrin / creatinine ratio | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Cobalamins, total measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Hydroxocobalamin measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Porphyrin measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Melatonin measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Part 1 Schilling test | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Vitamin B12 measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Chenodeoxycholic acid measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Tryptamine measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Urine heptaporphyrin concentration measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Bilirubin measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Detection of porphyrins | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Dimethyltryptamine measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Measurement of holotranscobalamin concentration | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Pindolol measurement | Is a | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Radiobioassay - vitamin B12 | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Biliverdin above reference range | Interprets | False | Pyrrole measurement | Inferred relationship | Existential restriction modifier | 1 | 
| Biliverdin above reference range | Interprets | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier | 1 | 
| Hyperbiliverdinemia | Interprets | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier | 1 | 
| Tolmetin measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Zomepirac measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Aquacobalamin measurement, serum | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  | 
| Bile pigment measurement | Is a | True | Pyrrole measurement | Inferred relationship | Existential restriction modifier |  |