What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINC

LOINC Code 5961-8: PT factor substitution 20 Min post incubation.37 deg c post addition of normal plasma Tilt tube (PPP) [Time]

Name: LOINC Code 5961-8: PT factor substitution 20 Min post incubation.37 deg c post addition of normal plasma Tilt tube (PPP) [Time]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:39.744Z

5961-8 is a LOINC code used to identify PT factor substitution 20 Min post incubation.37 deg c post addition of normal plasma Tilt tube (PPP) [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 tissue factor induced.factor substitution^20M post incubation.37 deg c after addition of normal plasma. It is commonly used with the system or sample type PPP.

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 tissue factor induced.factor substitution^20M post incubation.37 deg c after addition of normal plasma. It is commonly used with the system or sample type PPP.

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: Tilt tube

What it does not mean

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

Key facts

Deprecated Prothrombin time (PT) factor substitution in Platelet poor plasma by Coagulation assay --20M post incubation with normal plasma
Coagulation tissue factor induced.factor substitution^20M post incubation.37 deg c after addition of normal plasma
@37c; 20M p Inc; After; Coag; Control; degree; Fac; Fact; Hematology; Heme; Mixing studies; Plas; Platelet poor plasma; Point in time; Pro time; Prothrombin time; Protime; PST; PT; PT correction study; PT immediate mix; PT incubated mix; QNT; Quan; Quant; Quantitative; Random

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

PT factor substitution 20 Min post incubation.37 deg c post addition of normal plasma Tilt tube (PPP) [Time]Deprecated Prothrombin time (PT) factor substitution in Platelet poor plasma by Coagulation assay --20M post incubation with normal plasmaDeprecated PT PPP QnCoagulation tissue factor induced.factor substitution^20M post incubation.37 deg c after addition of normal plasmaCOAGPT factor substitution 20 Min after Incubation.37 Deg C after Addition of Normal Plasma, BloodTime

Frequently asked questions

Code details

Code5961-8

SystemLOINC

Display namePT factor substitution 20 Min post incubation.37 deg c post addition of normal plasma Tilt tube (PPP) [Time]

DescriptionCoagulation tissue factor induced.factor substitution^20M post incubation.37 deg c after addition of normal plasma

Short nameDeprecated PT PPP Qn

ComponentCoagulation tissue factor induced.factor substitution^20M post incubation.37 deg c after addition of normal plasma

PropertyTime

TimingPt

System (specimen)PPP

ScaleQn

MethodTilt tube

ClassCOAG

StatusDEPRECATED

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0d

Last changed2.36

Consumer names

PT factor substitution 20 Min after Incubation.37 Deg C after Addition of Normal Plasma, Blood

Part names

Coagulation tissue factor induced.factor substitution^20M post incubation.37 deg c after addition of normal plasmaTimePtPPPQnTilt tubeTime (e.g. seconds)Point in time (spot)Platelet poor plasma

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.