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 40100-0: Coagulation baseline aPTT (PPP) [Time]

Name: LOINC Code 40100-0: Coagulation baseline aPTT (PPP) [Time]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:27.144Z

40100-0 is a LOINC code used to identify Coagulation baseline aPTT (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^baseline. 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^baseline. 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

What it does not mean

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

Key facts

aPTT in Platelet poor plasma by Coagulation assay --baseline
Coagulation^baseline
aPTT; BS; Clot; Clottable; Coag; Coagulation assay; Hematology; Heme; Plas; Platelet poor plasma; Point in time; 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 baseline aPTT (PPP) [Time]aPTT in Platelet poor plasma by Coagulation assay --baselineaPTT BS PPPCoagulation^baselineCOAGCoagulation baseline, BloodTime

Frequently asked questions

Code details

Code40100-0

SystemLOINC

Display nameCoagulation baseline aPTT (PPP) [Time]

DescriptionCoagulation^baseline

Short nameaPTT BS PPP

ComponentCoagulation^baseline

PropertyTime

TimingPt

System (specimen)PPP

ScaleQn

MethodCoag.surface induced

ClassCOAG

Example unitss

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.15

Last changed2.82

Consumer names

Coagulation baseline, Blood

Part names

Coagulation^baselineTimePtPPPQnCoag.surface inducedTime (e.g. seconds)Point in time (spot)Platelet poor plasmaaPTT

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.