LOINC

LOINC Code 5898-2: aPTT Coag (P) [Time]

5898-2 is a LOINC code used to identify aPTT Coag (P) [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. It is commonly used with the system or sample type Plas.

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. It is commonly used with the system or sample type Plas.

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: Coag

What it does not mean

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

Key facts

  • Deprecated Activated partial thrombplastin time (aPTT) in Blood by Coagulation assay
  • Coagulation surface induced
  • Activated partial thromboplastin time; aPTT; Clot; Clottable; Coag; Coagulation assay; Hematology; Heme; Little(A)PTT; Partial Thromboplastin Time; Pl; Plasma; Plsm; Point in time; PTT; 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

aPTT Coag (P) [Time]Deprecated Activated partial thrombplastin time (aPTT) in Blood by Coagulation assayDeprecated aPTT Plas QnCoagulation surface inducedCOAGaPTT, BloodTime

Frequently asked questions

Code details

Code5898-2
SystemLOINC
Display nameaPTT Coag (P) [Time]
DescriptionCoagulation surface induced
Short nameDeprecated aPTT Plas Qn
ComponentCoagulation surface induced
PropertyTime
TimingPt
System (specimen)Plas
ScaleQn
MethodCoag
ClassCOAG
StatusDEPRECATED

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0
Last changed2.36

Consumer names

aPTT, Blood

Part names

Coagulation surface inducedTimePtPlasQnCoagaPTTTime (e.g. seconds)Point in time (spot)PlasmaCoagulation assay

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.