---
title: "fetal_biometry"
description: "Ultrasound and Doppler measurements of the dimensions of an embryo or fetus."
---

Ultrasound and Doppler measurements of the dimensions of an embryo or fetus.

**Purpose.** To record ultrasound and doppler measurements of an embryo or fetus in utero.

## Source

| Model | Leg | Role |
|---|---|---|
| `openEHR-EHR-OBSERVATION.fetal_biometry.v1` | openEHR | defines this table |

## Columns

| Column | Type | Null | Description | Source |
|---|---|---|---|---|
| `id` | `uuid primary key` | no | Primary key. | — |
| `form_id` | `uuid` → [`form`](/docs/tables/form) | no | The form this entry was recorded on. | — |
| `form_block_id` | `uuid` | yes | The block within the form, when the entry is bound to one. | — |
| `crown_rump_length_crl_magnitude`<br />`crown_rump_length_crl_units` | quantity<br />`numeric`, `text` | yes | Crown-rump length (CRL) | `/data[at0001]/events[at0002]/data[at0003]/items[at0004]` |
| `biparietal_diameter_bpd_magnitude`<br />`biparietal_diameter_bpd_units` | quantity<br />`numeric`, `text` | yes | Biparietal diameter (BPD) | `/data[at0001]/events[at0002]/data[at0003]/items[at0006]` |
| `occipito_frontal_diameter_ofd_magnitude`<br />`occipito_frontal_diameter_ofd_units` | quantity<br />`numeric`, `text` | yes | Occipito-frontal diameter (OFD) | `/data[at0001]/events[at0002]/data[at0003]/items[at0007]` |
| `head_circumference_hc_magnitude`<br />`head_circumference_hc_units` | quantity<br />`numeric`, `text` | yes | Head circumference (HC) | `/data[at0001]/events[at0002]/data[at0003]/items[at0008]` |
| `trans_cerebellar_diameter_tcd_magnitude`<br />`trans_cerebellar_diameter_tcd_units` | quantity<br />`numeric`, `text` | yes | Trans-cerebellar diameter (TCD) | `/data[at0001]/events[at0002]/data[at0003]/items[at0009]` |
| `interocular_distance_iod_magnitude`<br />`interocular_distance_iod_units` | quantity<br />`numeric`, `text` | yes | Interocular distance (IOD) | `/data[at0001]/events[at0002]/data[at0003]/items[at0010]` |
| `binocular_distance_bod_magnitude`<br />`binocular_distance_bod_units` | quantity<br />`numeric`, `text` | yes | Binocular distance (BOD) | `/data[at0001]/events[at0002]/data[at0003]/items[at0011]` |
| `abdominal_circumference_ac_magnitude`<br />`abdominal_circumference_ac_units` | quantity<br />`numeric`, `text` | yes | Abdominal circumference (AC) | `/data[at0001]/events[at0002]/data[at0003]/items[at0012]` |
| `femur_length_fl_magnitude`<br />`femur_length_fl_units` | quantity<br />`numeric`, `text` | yes | Femur length (FL) | `/data[at0001]/events[at0002]/data[at0003]/items[at0013]` |
| `humeral_length_hl_magnitude`<br />`humeral_length_hl_units` | quantity<br />`numeric`, `text` | yes | Humeral length (HL) | `/data[at0001]/events[at0002]/data[at0003]/items[at0014]` |
| `comment` | `text` | yes | Comment | `/data[at0001]/events[at0002]/data[at0003]/items[at0015]` |
| `bpd_method`<br />`bpd_method_code`<br />`bpd_method_system`<br />`bpd_method_valueset_id` | coded text<br />`text`, `text`, `text`, `text` | yes | BPD method | `/protocol[at0016]/items[at0017]` |

## Constraints

```sql
check ((crown_rump_length_crl_magnitude is null and crown_rump_length_crl_units is null) or (crown_rump_length_crl_magnitude is not null and crown_rump_length_crl_units is not null))
check (crown_rump_length_crl_magnitude is null or (crown_rump_length_crl_units = 'mm' and crown_rump_length_crl_magnitude >= 0) or (crown_rump_length_crl_units = 'cm' and crown_rump_length_crl_magnitude >= 0) or (crown_rump_length_crl_units = '[in_i]' and crown_rump_length_crl_magnitude >= 0))
check ((biparietal_diameter_bpd_magnitude is null and biparietal_diameter_bpd_units is null) or (biparietal_diameter_bpd_magnitude is not null and biparietal_diameter_bpd_units is not null))
check (biparietal_diameter_bpd_magnitude is null or (biparietal_diameter_bpd_units = 'mm' and biparietal_diameter_bpd_magnitude >= 0) or (biparietal_diameter_bpd_units = 'cm' and biparietal_diameter_bpd_magnitude >= 0) or (biparietal_diameter_bpd_units = '[in_i]' and biparietal_diameter_bpd_magnitude >= 0))
check ((occipito_frontal_diameter_ofd_magnitude is null and occipito_frontal_diameter_ofd_units is null) or (occipito_frontal_diameter_ofd_magnitude is not null and occipito_frontal_diameter_ofd_units is not null))
check (occipito_frontal_diameter_ofd_magnitude is null or (occipito_frontal_diameter_ofd_units = 'mm' and occipito_frontal_diameter_ofd_magnitude >= 0) or (occipito_frontal_diameter_ofd_units = 'cm' and occipito_frontal_diameter_ofd_magnitude >= 0) or (occipito_frontal_diameter_ofd_units = '[in_i]' and occipito_frontal_diameter_ofd_magnitude >= 0))
check ((head_circumference_hc_magnitude is null and head_circumference_hc_units is null) or (head_circumference_hc_magnitude is not null and head_circumference_hc_units is not null))
check (head_circumference_hc_magnitude is null or (head_circumference_hc_units = 'mm' and head_circumference_hc_magnitude >= 0) or (head_circumference_hc_units = 'cm' and head_circumference_hc_magnitude >= 0) or (head_circumference_hc_units = '[in_i]' and head_circumference_hc_magnitude >= 0))
check ((trans_cerebellar_diameter_tcd_magnitude is null and trans_cerebellar_diameter_tcd_units is null) or (trans_cerebellar_diameter_tcd_magnitude is not null and trans_cerebellar_diameter_tcd_units is not null))
check (trans_cerebellar_diameter_tcd_magnitude is null or (trans_cerebellar_diameter_tcd_units = 'mm' and trans_cerebellar_diameter_tcd_magnitude >= 0) or (trans_cerebellar_diameter_tcd_units = 'cm' and trans_cerebellar_diameter_tcd_magnitude >= 0) or (trans_cerebellar_diameter_tcd_units = '[in_i]' and trans_cerebellar_diameter_tcd_magnitude >= 0))
check ((interocular_distance_iod_magnitude is null and interocular_distance_iod_units is null) or (interocular_distance_iod_magnitude is not null and interocular_distance_iod_units is not null))
check (interocular_distance_iod_magnitude is null or (interocular_distance_iod_units = 'mm' and interocular_distance_iod_magnitude >= 0) or (interocular_distance_iod_units = 'cm' and interocular_distance_iod_magnitude >= 0) or (interocular_distance_iod_units = '[in_i]' and interocular_distance_iod_magnitude >= 0))
check ((binocular_distance_bod_magnitude is null and binocular_distance_bod_units is null) or (binocular_distance_bod_magnitude is not null and binocular_distance_bod_units is not null))
check (binocular_distance_bod_magnitude is null or (binocular_distance_bod_units = 'mm' and binocular_distance_bod_magnitude >= 0) or (binocular_distance_bod_units = 'cm' and binocular_distance_bod_magnitude >= 0) or (binocular_distance_bod_units = '[in_i]' and binocular_distance_bod_magnitude >= 0))
check ((abdominal_circumference_ac_magnitude is null and abdominal_circumference_ac_units is null) or (abdominal_circumference_ac_magnitude is not null and abdominal_circumference_ac_units is not null))
check (abdominal_circumference_ac_magnitude is null or (abdominal_circumference_ac_units = 'mm' and abdominal_circumference_ac_magnitude >= 0) or (abdominal_circumference_ac_units = 'cm' and abdominal_circumference_ac_magnitude >= 0) or (abdominal_circumference_ac_units = '[in_i]' and abdominal_circumference_ac_magnitude >= 0))
check ((femur_length_fl_magnitude is null and femur_length_fl_units is null) or (femur_length_fl_magnitude is not null and femur_length_fl_units is not null))
check (femur_length_fl_magnitude is null or (femur_length_fl_units = 'mm' and femur_length_fl_magnitude >= 0) or (femur_length_fl_units = 'cm' and femur_length_fl_magnitude >= 0) or (femur_length_fl_units = '[in_i]' and femur_length_fl_magnitude >= 0))
check ((humeral_length_hl_magnitude is null and humeral_length_hl_units is null) or (humeral_length_hl_magnitude is not null and humeral_length_hl_units is not null))
check (humeral_length_hl_magnitude is null or (humeral_length_hl_units = 'mm' and humeral_length_hl_magnitude >= 0) or (humeral_length_hl_units = 'cm' and humeral_length_hl_magnitude >= 0) or (humeral_length_hl_units = '[in_i]' and humeral_length_hl_magnitude >= 0))
check ((bpd_method_code is null and bpd_method_system is null and bpd_method_valueset_id is null and bpd_method is null) or (bpd_method is not null and bpd_method_code is not null and bpd_method_system is not null and bpd_method_valueset_id is not null))
```

## Unique

- `form_block_id`

## References

| Columns | Target | On delete |
|---|---|---|
| `form_id` | [`form`](/docs/tables/form) | cascade |
| `form_id, form_block_id` | [`form_block`](/docs/tables/form_block) | cascade |
| `bpd_method_valueset_id, bpd_method_code, bpd_method_system, bpd_method` | [`valueset_code`](/docs/tables/valueset_code) | restrict |

## Indexes

- `fetal_biometry_form_id_idx` on `form_id`

## Value sets

| Value set | Codes |
|---|---|
| `org.openehr::openEHR-EHR-OBSERVATION.fetal_biometry.v1/bpd_method` | 2 |