LOINC

LOINC Code 13621-8: Thrombin time Coag [Time]

13621-8 is a LOINC code used to identify Thrombin time Coag [Time] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Coagulation thrombin induced. It is commonly used with the system or sample type -.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Coagulation thrombin induced. It is commonly used with the system or sample type -.

When is it used?

  • Used in lab systems, EHRs, and clinical data exchange.
  • May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
  • Status: DEPRECATED
  • Method: Coag

What it does not mean

  • The code identifies the observation or test, not the actual result.

Key facts

  • Deprecated Thrombin time in Platelet poor plasma from control by Coagulation assay
  • Coagulation thrombin induced
  • Clot; Clottable; Coag; Coagulation assay; Hematology; Heme; Point in time; QNT; Quan; Quant; Quantitative; Random; TCT; Throm; Thrombin clotting time; Thrombin time; Tilt tube; TT

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Thrombin time Coag [Time]Deprecated Thrombin time in Platelet poor plasma from control by Coagulation assayDeprecated TT QnCoagulation thrombin inducedCOAGThrombin timeTime

Frequently asked questions

Code details

Code13621-8
SystemLOINC
Display nameThrombin time Coag [Time]
DescriptionCoagulation thrombin induced
Short nameDeprecated TT Qn
ComponentCoagulation thrombin induced
PropertyTime
TimingPt
System (specimen)-
ScaleQn
MethodCoag
ClassCOAG
Example unitss
StatusDEPRECATED

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0k
Last changed2.70

Consumer names

Thrombin time

Part names

Coagulation thrombin inducedTimePt-QnCoagThrombin timeTime (e.g. seconds)Point in time (spot)Coagulation assay

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

LOINC Code 13621-8 | HealthAssure