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.

LOINCActiveObservation

LOINC Code 34189-1: Coagulation Coag.surface induced.factor substitution.30M post incubation after addition of normal plasma (PPP) [Time]

Name: LOINC Code 34189-1: Coagulation Coag.surface induced.factor substitution.30M post incubation after addition of normal plasma (PPP) [Time]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:21.188Z

34189-1 is a LOINC code used to identify Coagulation Coag.surface induced.factor substitution.30M post incubation after addition of normal plasma (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. 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. 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: ACTIVE
Order vs observation: Observation
Method: Coag.surface induced.factor substitution.30M post incubation after addition of normal plasma

What it does not mean

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

Key facts

Coag.surface induced.factor substitution.30M post incubation after addition of normal plasma in Platelet poor plasma by Coagulation assay
Coagulation
After; aPTT; aPTT 30M NP; aPTT-FS; Clot; Clottable; Coag; Coagulation assay; Control; Fac; Fact; Hematology; Heme; Plas; Platelet poor plasma; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; Surf; Tilt tube

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

Coagulation Coag.surface induced.factor substitution.30M post incubation after addition of normal plasma (PPP) [Time]Coag.surface induced.factor substitution.30M post incubation after addition of normal plasma in Platelet poor plasma by Coagulation assayaPTT 30M NP PPPCoagulationCOAGCoagulation, BloodTime

Frequently asked questions

Code details

Code34189-1

SystemLOINC

Display nameCoagulation Coag.surface induced.factor substitution.30M post incubation after addition of normal plasma (PPP) [Time]

DescriptionCoagulation

Short nameaPTT 30M NP PPP

ComponentCoagulation

PropertyTime

TimingPt

System (specimen)PPP

ScaleQn

MethodCoag.surface induced.factor substitution.30M post incubation after addition of normal plasma

ClassCOAG

Example unitss

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.10

Last changed2.82

Consumer names

Coagulation, Blood

Part names

CoagulationTimePtPPPQnCoag.surface induced.factor substitution.30M post incubation after addition of normal plasmaTime (e.g. seconds)Point in time (spot)Platelet poor plasmaaPTT.factor substitution 30M post incubation with normal 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.