LOINCActiveOrder

LOINC Code 55401-4: Warfarin tracking panel (PPP)

55401-4 is a LOINC code used to identify Warfarin tracking panel (PPP) 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 Warfarin tracking panel. 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 Warfarin tracking panel. 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: Order
  • Panel type: Panel

What it does not mean

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

Key facts

  • Warfarin tracking panel - Platelet poor plasma
  • Warfarin tracking panel
  • 4-Hydroxycoumarin; COAGULATION; Coumadin; Coumarin; Coumarins; Pan; PANEL.COAGULATION; Panl; Panwarfin; Plas; Platelet poor plasma; Pnl; Point in time; Random; Sofarin; Warfarin tracking Pnl

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

Warfarin tracking panel (PPP)Warfarin tracking panel - Platelet poor plasmaWarfarin tracking Pnl PPPWarfarin tracking panelPANEL.COAGWarfarin tracking panel, Blood-

Frequently asked questions

Code details

Code55401-4
SystemLOINC
Display nameWarfarin tracking panel (PPP)
DescriptionWarfarin tracking panel
Short nameWarfarin tracking Pnl PPP
ComponentWarfarin tracking panel
Property-
TimingPt
System (specimen)PPP
Scale-
ClassPANEL.COAG
StatusACTIVE
Order/ObservationOrder

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.27
Last changed2.66

Consumer names

Warfarin tracking panel, Blood

Part names

Warfarin tracking panel-PtPPPPoint 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.

LOINC Code 55401-4 | HealthAssure