Intermediate Cuff Pressure (0x2A36): byte layout
GATT characteristic · org.bluetooth.characteristic.intermediate_cuff_pressure · read from the Bluetooth SIG’s repository on 2026-10-17 · commit 408f4a0 (2026-10-14)
Intermediate Cuff Pressure is Bluetooth GATT characteristic 0x2A36, org.bluetooth.characteristic.intermediate_cuff_pressure in the Bluetooth SIG's assigned numbers. The SIG's GATT Specification Supplement file lays its value out as 9 fields: Flags, Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (mmHg), Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (kPa), Intermediate Cuff Pressure Compound Value - Diastolic (unused), Intermediate Cuff Pressure Compound Value - Mean Arterial Pressure (unused) and 4 more. The first, Flags, is a boolean[8]; 6 of the others are present only when a bit of it is set as the field's text states, so after the first of those, a field's offset depends on which bits are set.
- UUID
- 0x2A36
- Identifier
org.bluetooth.characteristic.intermediate_cuff_pressure- The SIG’s description
- The Intermediate Cuff Pressure characteristic is used to send intermediate Cuff Pressure values to a device for display purposes while a measurement is in progress. The Intermediate Cuff Pressure characteristic has the same format as the Blood Pressure Measurement characteristic in Blood Pressure Measurement (0x2A35). However, due to a different context, the Blood Pressure Measurement Compound Value field is used for the Intermediate Cuff Pressure Compound Value field and the Systolic sub-field is used for the Current Cuff Pressure sub-field. The Diastolic and Mean Arterial Pressure fields are unused.The structure of this characteristic is defined below.
- Service the SIG’s files tie it to
- None: no file in the repository lists this characteristic under a service.
- Source file
- gss/org.bluetooth.characteristic.intermediate_cuff_pressure.yaml
Byte layout: 9 fields
In the order the SIG’s structure lists them. Type and size are as published; sizes count octets except where a struct is marked as sized in bits. The offset is printed only where every earlier field has a fixed size; where an earlier field can be absent or vary, the cell names what it depends on. “Present when” is read from the field’s own “Present if” line, shown in full in the field notes below.
| Offset | Field | Type | Size | Present when | Unit |
|---|---|---|---|---|---|
| 0 | Flags | boolean[8] | 1 | Always (fixed size) | — |
| 1 | Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (mmHg) | medfloat16 | 0 or 2 | Bit 0 of Flags is 0 | pressure (millimetre of mercury)org.bluetooth.unit.pressure.millimetre_of_mercury |
| Depends on Flags (bit 0) | Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (kPa) | medfloat16 | 0 or 2 | Bit 0 of Flags is 1 | pressure (pascal)org.bluetooth.unit.pressure.pascal |
| Depends on Flags (bit 0) | Intermediate Cuff Pressure Compound Value - Diastolic (unused) | medfloat16 | 2 | Always (fixed size) | — |
| Depends on Flags (bit 0) | Intermediate Cuff Pressure Compound Value - Mean Arterial Pressure (unused) | medfloat16 | 2 | Always (fixed size) | — |
| Depends on Flags (bit 0) | Time Stamp | struct | 0 or 7 | Bit 1 of Flags is 1 | — |
| Depends on Flags (bits 0 and 1) | Pulse Rate | medfloat16 | 0 or 2 | Bit 2 of Flags is 1 | period (beats per minute)org.bluetooth.unit.period.beats_per_minute |
| Depends on Flags (bits 0, 1 and 2) | User ID | uint8 | 0 or 1 | Bit 3 of Flags is 1 | — |
| Depends on Flags (bits 0, 1, 2 and 3) | Measurement Status | boolean[16] | 0 or 2 | Bit 4 of Flags is 1 | — |
Field notes
Each field’s text in the SIG’s file, line by line.
- Flags boolean[8] · 1
- See Flags.
- Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (mmHg) medfloat16 · 0 or 2
- Unit: org.bluetooth.unit.pressure.millimetre_of_mercuryPresent if bit 0 of Flags field is set to 0
- Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (kPa) medfloat16 · 0 or 2
- Base Unit: org.bluetooth.unit.pressure.pascal;M = 1, d = 3, and b = 0Present if bit 0 of Flags field is set to 1
- Intermediate Cuff Pressure Compound Value - Diastolic (unused) medfloat16 · 2
- This subfield is not used and is set to the special value NaN.
- Intermediate Cuff Pressure Compound Value - Mean Arterial Pressure (unused) medfloat16 · 2
- This subfield is not used and is set to the special value NaN.
- Time Stamp struct · 0 or 7
- Refer to Date Time characteristic in Date Time (0x2A08)Present if bit 1 of Flags field is set to 1
- Pulse Rate medfloat16 · 0 or 2
- Unit: org.bluetooth.unit.period.beats_per_minutePresent if bit 2 of Flags field is set to 1
- User ID uint8 · 0 or 1
- See User ID.Present if bit 3 of Flags field is set to 1
- Measurement Status boolean[16] · 0 or 2
- See Measurement Status.Present if bit 4 of Flags field is set to 1
Flags and value tables
The definitions the SIG’s file gives for its fields, every row as published. On a flags table the last column lists the fields whose “Present if” line names that bit.
Flags
These flags define which data fields are present in the characteristic value.The bits of this field are defined below.
| Bit | Description | Fields its condition names |
|---|---|---|
| 0 | Intermediate Cuff Pressure Units Flag0 = Intermediate Cuff pressure for Systolic, Diastolic and MAP in units of mmHg1 = Intermediate Cuff pressure for Systolic, Diastolic and MAP in units of kPa | Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (mmHg) when 0Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (kPa) when 1 |
| 1 | Time Stamp Flag0 = Time Stamp not present1 = Time Stamp present | Time Stamp when 1 |
| 2 | Pulse Rate Flag0 = Pulse Rate not present1 = Pulse Rate present | Pulse Rate when 1 |
| 3 | User ID Flag0 = User ID not present1 = User ID present | User ID when 1 |
| 4 | Measurement Status Flag0 = Measurement Status not present1 = Measurement Status present | Measurement Status when 1 |
| 5–7 | Reserved for Future Use | — |
User ID
The values of this field are defined below.
| Value | Description |
|---|---|
| 0x00–0xFE | Defined by the service specification |
| 0xFF | Unknown User |
Measurement Status
The bits of this field are defined below.
| Bit | Description | Fields its condition names |
|---|---|---|
| 0 | Body Movement Detection Flag0 = No body movement1 = Body movement detected during measurement | — |
| 1 | Cuff Fit Detection Flag0 = Cuff fits properly1 = Cuff too loose | — |
| 2 | Irregular Pulse Detection Flag0 = No irregular pulse detected1 = Irregular pulse detected | — |
| 3–4 | Pulse Rate Range Detection Flags0b00 = Pulse rate is within the range0b01 = Pulse rate exceeds upper limit0b10 = Pulse rate is less than lower limit0b11 = Reserved for Future Use | — |
| 5 | Measurement Position Detection Flag0 = Proper measurement position1 = Improper measurement position | — |
| 6–15 | Reserved for Future Use | — |
Guides on this site
No guide on this site names 0x2A36 yet. The connected-devices guides cover pairing, subscribing and testing for the device types they do name.
Questions
- What is the UUID of the Intermediate Cuff Pressure characteristic?
- 0x2A36. The Bluetooth SIG's characteristic_uuids.yaml lists Intermediate Cuff Pressure as 0x2A36 with the identifier org.bluetooth.characteristic.intermediate_cuff_pressure. No file in the SIG's repository ties it to a service: the repository lists service and characteristic UUIDs separately.
- Which Intermediate Cuff Pressure fields are optional?
- 6 of its 9 fields have a published size that can be zero: Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (mmHg) (0 or 2; Present if bit 0 of Flags field is set to 0); Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (kPa) (0 or 2; Present if bit 0 of Flags field is set to 1); Time Stamp (0 or 7; Present if bit 1 of Flags field is set to 1); Pulse Rate (0 or 2; Present if bit 2 of Flags field is set to 1); User ID (0 or 1; Present if bit 3 of Flags field is set to 1); Measurement Status (0 or 2; Present if bit 4 of Flags field is set to 1). Flags (1), Intermediate Cuff Pressure Compound Value - Diastolic (unused) (2) and Intermediate Cuff Pressure Compound Value - Mean Arterial Pressure (unused) (2) have a fixed size.
- What units does Intermediate Cuff Pressure use?
- The SIG's text names a unit for 3 of the 9 fields: Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (mmHg): pressure (millimetre of mercury) (org.bluetooth.unit.pressure.millimetre_of_mercury); Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (kPa): pressure (pascal) (org.bluetooth.unit.pressure.pascal); Pulse Rate: period (beats per minute) (org.bluetooth.unit.period.beats_per_minute).
- What do the bits of the Intermediate Cuff Pressure Flags field mean?
- The SIG defines them as: bit 0, Intermediate Cuff Pressure Units Flag; 0 = Intermediate Cuff pressure for Systolic, Diastolic and MAP in units of mmHg; 1 = Intermediate Cuff pressure for Systolic, Diastolic and MAP in units of kPa (Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (mmHg) when 0, Intermediate Cuff Pressure Compound Value - Current Cuff Pressure (kPa) when 1); bit 1, Time Stamp Flag; 0 = Time Stamp not present; 1 = Time Stamp present (Time Stamp when 1); bit 2, Pulse Rate Flag; 0 = Pulse Rate not present; 1 = Pulse Rate present (Pulse Rate when 1); bit 3, User ID Flag; 0 = User ID not present; 1 = User ID present (User ID when 1); bit 4, Measurement Status Flag; 0 = Measurement Status not present; 1 = Measurement Status present (Measurement Status when 1). The remaining bits are reserved for future use.
- Which values does the Intermediate Cuff Pressure User ID table define?
- 0x00–0xFE: Defined by the service specification; 0xFF: Unknown User.
Source
Read on 2026-10-17 from gss/org.bluetooth.characteristic.intermediate_cuff_pressure.yaml and assigned_numbers/uuids/characteristic_uuids.yaml in the Bluetooth SIG’s public repository (branch main, commit 408f4a0, committed 2026-10-14), by scripts/fetch-bluetooth-gatt.mjs. The file’s notice says it is proprietary to Bluetooth SIG, that furnishing it grants no licence, and that it is subject to change without notice; it is © Bluetooth SIG, Inc., and its text is quoted here for identification. Generated by AIFitnessAPI, which is not affiliated with Bluetooth SIG; the SIG’s file remains the authority. The full notice and the conventions used on these pages are on the reference hub.