Partial Thromboplastin Time

PTT

clinical

Updated 5/16/2026

Definition

A coagulation laboratory test measuring the time required for plasma to clot via the intrinsic and common pathways, used to evaluate bleeding disorders and monitor heparin therapy. Reported as a numeric result in LIS and EHR systems using LOINC code 3173-2, and critical in clinical data warehouses for anticoagulation management and sepsis protocol analytics.

Standard Abbreviation

PTT

Database Usage

-- Example column naming
CREATE TABLE claims (
  clm_id VARCHAR(50),
  ptt VARCHAR(100),  -- Partial Thromboplastin Time (max 100 chars)
  ...
);

-- Example in SELECT
SELECT
  clm_id,
  ptt as partial_thromboplastin_time
FROM claims;

Common uses in healthcare data

Risk stratification and population health analytics
CMS-HCC risk adjustment and RAF score calculation
Quality measure attribution and HEDIS reporting
Clinical data warehouse schema design
Value-based care contract performance tracking

Example database column name

ISO-11179 snake_case standard

-- Recommended column name
ptt

-- Example DDL
CREATE TABLE healthcare_data (
  record_id   VARCHAR(50)   NOT NULL,
  ptt          VARCHAR(100),  -- Partial Thromboplastin Time (max 100 chars)
  created_dt  TIMESTAMP     NOT NULL DEFAULT NOW()
);

Column names follow the ISO-11179 naming convention: lowercase, underscore-separated, using the standard abbreviation as a prefix where applicable.

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