---
title: "exam_zygote"
description: "Morphological findings obtained by microscopy of the human zygote."
---

Morphological findings obtained by microscopy of the human zygote.

**Purpose.** To record structured observations of the human zygote.

## Source

| Model | Leg | Role |
|---|---|---|
| `openEHR-EHR-CLUSTER.exam_zygote.v1` | openEHR | defines this table |

## Columns

| Column | Type | Null | Description | Source |
|---|---|---|---|---|
| `id` | `uuid primary key` | no | Primary key. | — |
| `number_of_pronuclei` | `integer` | yes | Number of pronuclei | `/items[at0005]` |
| `pronuclear_symmetry`<br />`pronuclear_symmetry_code`<br />`pronuclear_symmetry_system`<br />`pronuclear_symmetry_valueset_id` | coded text<br />`text`, `text`, `text`, `text` | yes | Pronuclear symmetry | `/items[at0001]` |
| `pronuclear_morphology`<br />`pronuclear_morphology_code`<br />`pronuclear_morphology_system`<br />`pronuclear_morphology_valueset_id` | coded text<br />`text`, `text`, `text`, `text` | yes | Pronuclear morphology | `/items[at0002]` |
| `number_of_polar_bodies` | `integer` | yes | Number of polar bodies | `/items[at0034]` |
| `polar_body_morphology`<br />`polar_body_morphology_code`<br />`polar_body_morphology_system`<br />`polar_body_morphology_valueset_id` | coded text<br />`text`, `text`, `text`, `text` | yes | Polar body morphology | `/items[at0003]` |
| `cytoplasmic_morphology`<br />`cytoplasmic_morphology_code`<br />`cytoplasmic_morphology_system`<br />`cytoplasmic_morphology_valueset_id` | coded text<br />`text`, `text`, `text`, `text` | yes | Cytoplasmic morphology | `/items[at0004]` |
| `nucleolar_precursor_bodies`<br />`nucleolar_precursor_bodies_code`<br />`nucleolar_precursor_bodies_system`<br />`nucleolar_precursor_bodies_valueset_id` | coded text<br />`text`, `text`, `text`, `text` | yes | Nucleolar precursor bodies | `/items[at0019]` |
| `other_morphological_features` | `text` | yes | Other morphological features | `/items[at0028]` |
| `morphology_grade`<br />`morphology_grade_code`<br />`morphology_grade_system`<br />`morphology_grade_valueset_id` | coded text<br />`text`, `text`, `text`, `text` | yes | Morphology grade | `/items[at0032]` |

## Constraints

```sql
check ((pronuclear_symmetry_code is null and pronuclear_symmetry_system is null and pronuclear_symmetry_valueset_id is null) or (pronuclear_symmetry is not null and pronuclear_symmetry_code is not null and pronuclear_symmetry_system is not null and pronuclear_symmetry_valueset_id is not null))
check ((pronuclear_morphology_code is null and pronuclear_morphology_system is null and pronuclear_morphology_valueset_id is null) or (pronuclear_morphology is not null and pronuclear_morphology_code is not null and pronuclear_morphology_system is not null and pronuclear_morphology_valueset_id is not null))
check ((polar_body_morphology_code is null and polar_body_morphology_system is null and polar_body_morphology_valueset_id is null) or (polar_body_morphology is not null and polar_body_morphology_code is not null and polar_body_morphology_system is not null and polar_body_morphology_valueset_id is not null))
check ((cytoplasmic_morphology_code is null and cytoplasmic_morphology_system is null and cytoplasmic_morphology_valueset_id is null) or (cytoplasmic_morphology is not null and cytoplasmic_morphology_code is not null and cytoplasmic_morphology_system is not null and cytoplasmic_morphology_valueset_id is not null))
check ((nucleolar_precursor_bodies_code is null and nucleolar_precursor_bodies_system is null and nucleolar_precursor_bodies_valueset_id is null) or (nucleolar_precursor_bodies is not null and nucleolar_precursor_bodies_code is not null and nucleolar_precursor_bodies_system is not null and nucleolar_precursor_bodies_valueset_id is not null))
check ((morphology_grade_code is null and morphology_grade_system is null and morphology_grade_valueset_id is null) or (morphology_grade is not null and morphology_grade_code is not null and morphology_grade_system is not null and morphology_grade_valueset_id is not null))
```

## References

| Columns | Target | On delete |
|---|---|---|
| `pronuclear_symmetry_valueset_id, pronuclear_symmetry_code, pronuclear_symmetry_system, pronuclear_symmetry` | [`valueset_code`](/docs/tables/valueset_code) | restrict |
| `pronuclear_morphology_valueset_id, pronuclear_morphology_code, pronuclear_morphology_system, pronuclear_morphology` | [`valueset_code`](/docs/tables/valueset_code) | restrict |
| `polar_body_morphology_valueset_id, polar_body_morphology_code, polar_body_morphology_system, polar_body_morphology` | [`valueset_code`](/docs/tables/valueset_code) | restrict |
| `cytoplasmic_morphology_valueset_id, cytoplasmic_morphology_code, cytoplasmic_morphology_system, cytoplasmic_morphology` | [`valueset_code`](/docs/tables/valueset_code) | restrict |
| `nucleolar_precursor_bodies_valueset_id, nucleolar_precursor_bodies_code, nucleolar_precursor_bodies_system, nucleolar_precursor_bodies` | [`valueset_code`](/docs/tables/valueset_code) | restrict |
| `morphology_grade_valueset_id, morphology_grade_code, morphology_grade_system, morphology_grade` | [`valueset_code`](/docs/tables/valueset_code) | restrict |

## Referenced by

- [`embryo_assessment_morphological_findings`](/docs/tables/embryo_assessment_morphological_findings) via `exam_zygote_id`

## Value sets

| Value set | Codes |
|---|---|
| `org.openehr::openEHR-EHR-CLUSTER.exam_zygote.v1/cytoplasmic_morphology` | 4 |
| `org.openehr::openEHR-EHR-CLUSTER.exam_zygote.v1/nucleolar_precursor_bodies` | 3 |
| `org.openehr::openEHR-EHR-CLUSTER.exam_zygote.v1/polar_body_morphology` | 4 |
| `org.openehr::openEHR-EHR-CLUSTER.exam_zygote.v1/pronuclear_morphology` | 3 |
| `org.openehr::openEHR-EHR-CLUSTER.exam_zygote.v1/pronuclear_symmetry` | 2 |