Request for: {Clot signal units}/min

[timbrisc]

{Clot signal units}/min is used to measure the Clot Rate in the Platelet Function Analyzer system. It represents the rate of fibrin formation (viscosity change) in a blood sample, calculated as the change in Clot Signal Units over time.

96695-2

Microviscometer analyzers used clinically for coagulation assays commonly report a unit for clot formation that monotonically increases with increasing viscosity but is not a standard viscosity unit such as centipoise. The clot unit produced by these assays has a long historical precedent. It is considered a measure of viscosity of a liquid prior to clot formation and the viscous component of a viscoelastic gel after clot formation, albeit reported on a continuous scale.

Microviscometry is a method that measures the viscous property of a liquid or gel. In the field of hemostasis, it is employed as a way to follow the physical properties of a blood sample during coagulation and fibrin formation. It differs from thromboelastography, which evaluates the developing stiffness of a forming clot, in that microviscometry evaluates the viscosity changes in blood even before a clot begins to form and tracks these changes during and after clot formation.

[timbrisc]

Noting this summary from Google Gemini.

In the Unified Code for Units of Measure (UCUM), units are designed to be machine-readable and strictly defined to avoid ambiguity in electronic health records and scientific databases.

For microviscometry, UCUM follows the standard SI-derived patterns but requires specific syntax for prefixes and operators.

Standard UCUM Viscosity Units

The most common units you'll encounter for dynamic viscosity in a UCUM-compliant system are:

• mPa.s (milliPascal-second): This is the UCUM equivalent of the centipoise (cP).

  • UCUM Syntax: mPa.s

• Pa.s (Pascal-second): The base unit for dynamic viscosity.

  • UCUM Syntax: Pa.s

• P (Poise): While UCUM supports the Poise, it is categorized as a "non-SI unit" and is less common in modern digital headers than Pascal-seconds.

  • UCUM Syntax: P

• cP (centipoise): * UCUM Syntax: cP (Note: UCUM is case-sensitive; cP is the standard for centipoise).

---

Kinematic and Diffusion Units

In micro-scale studies involving particle tracking (microrheology), the following UCUM codes are used:

Measure | Standard Unit | UCUM Code -- | -- | -- Kinematic Viscosity | Stokes | St Kinematic Viscosity | Centistokes | cSt Diffusion Coefficient | $mm^2/s$ | mm2/s Diffusion Coefficient | $\mu m^2/s$ | um2/s

---

Important UCUM Syntax Rules

When using these in a database or software environment, keep these formatting rules in mind:

1. Case Sensitivity: In "Level 2" UCUM (the most common), case matters. MPA.S is not the same as mPa.s.

2. The Dot Operator: Use a period . to indicate multiplication between units (e.g., Pa.s).

3. No Subscripts: Superscripts are written as plain numbers directly following the unit (e.g., $cm^2$ becomes cm2).

Note on Microviscosity Probes: If you are measuring Rotational Correlation Time, the UCUM unit is simply a unit of time, typically ns (nanoseconds) or ps (picoseconds).

Would you like me to help you format a specific set of measurement data into a UCUM-compliant table?