Normal range

Normal

14.7–23 seconds (varies by lab) ABIM 17–23 · ARUP 14.7–19.5 seconds

These labs do not agree: the published adult ranges differ by up to 18%, so the same result can read as normal at one lab and be flagged at another — ABIM 17–23 · ARUP 14.7–19.5 seconds. Both are real published values, shown as each lab states them.

Ranges from ARUP Laboratories Test Directory, American Board of Internal Medicine (Laboratory Test Reference Ranges).

What an abnormal result can be associated with

A high result

Prolonged prothrombin time

A low result

Decreased prothrombin time

Associations from LOINC2HPO (Human Phenotype Ontology). This is reference information, not a diagnosis — only a clinician can interpret your result in context.

Details

Sample

Serum or plasma · LOINC

Code

LOINC 3243-3 · seconds

Also known as

Heme, Clot, TT, Throm, Coagulation assay