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 5953-5: aPTT.factor substitution 20 Min post incubation.37 deg c post addition of normal plasma Tilt tube (PPP control) [Time]

Name: LOINC Code 5953-5: aPTT.factor substitution 20 Min post incubation.37 deg c post addition of normal plasma Tilt tube (PPP control) [Time]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:39.744Z

5953-5 is a LOINC code used to identify aPTT.factor substitution 20 Min post incubation.37 deg c post addition of normal plasma Tilt tube (PPP control) [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 surface 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^Control.

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 surface 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^Control.

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 Activated partial thrombplastin time (aPTT).factor substitution in Platelet poor plasma from control by Coagulation assay --20M post incubation with normal plasma
Coagulation surface induced.factor substitution^20M post incubation.37 deg c after addition of normal plasma
@37c; 20M p Inc; Activated partial thromboplastin time; After; aPTT; aPTT correction study; Coag; Contrl; Control; degree; Fac; Fact; Hematology; Heme; Little(A)PTT; Mixing studies; Normal; Partial Thromboplastin Time; Plas; Platelet poor plasma; Point in time; PST; PTT; QNT; Quan; Quant; Quantitative; Random; Surf

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

aPTT.factor substitution 20 Min post incubation.37 deg c post addition of normal plasma Tilt tube (PPP control) [Time]Deprecated Activated partial thrombplastin time (aPTT).factor substitution in Platelet poor plasma from control by Coagulation assay --20M post incubation with normal plasmaDeprecated aPTT PPP Cont QnCoagulation surface induced.factor substitution^20M post incubation.37 deg c after addition of normal plasmaCOAGaPTT.factor substitution 20 Min after Incubation.37 Deg C after Addition of Normal Plasma, control BloodTime

Frequently asked questions

Code details

Code5953-5

SystemLOINC

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

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

Short nameDeprecated aPTT PPP Cont Qn

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

PropertyTime

TimingPt

System (specimen)PPP^Control

ScaleQn

MethodTilt tube

ClassCOAG

StatusDEPRECATED

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0d

Last changed2.36

Consumer names

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

Part names

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

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.