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.

LOINCActiveBoth

LOINC Code 52766-3: aPTT after addition of protein C activator+Factor V depleted plasma/Coagulation surface induced Coag (PPP) [Time ratio]

Name: LOINC Code 52766-3: aPTT after addition of protein C activator+Factor V depleted plasma/Coagulation surface induced Coag (PPP) [Time ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:36.028Z

52766-3 is a LOINC code used to identify aPTT after addition of protein C activator+Factor V depleted plasma/Coagulation surface induced Coag (PPP) [Time ratio] 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^after addition of protein C activator+Factor V depleted plasma/Coagulation surface induced. 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 surface induced^after addition of protein C activator+Factor V depleted plasma/Coagulation surface induced. 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: Both
Method: Coag

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 -- after addition of protein C activator + Factor V depleted plasma/aPTT
Coagulation surface induced^after addition of protein C activator+Factor V depleted plasma/Coagulation surface induced
The protein C pathway the patient's protein C is activated by agkistrodon contortrix (Protac[TM]). Then, an aPTT or DVVR-based coagulation is started. These tests should screen the protein C pathway covering protein C defects, protein S defects and Factor V Leiden mutations. Used in combination with factor V deficient plasma these tests can specifically detect problems with factor V.
Activated partial thromboplastin time; aPTT; Autoprothrombin II-a; Clot; Clottable; Coag; Coagulation assay; Fac; Fact; Factor 5; FV; Hematology; Heme; Little(A)PTT; Partial Thromboplastin Time; PC; Plas; Platelet poor plasma; Point in time; PR; Prot; Prot C; Prot C+FV activity-dependent aPTT; protein C activator+FV DP; PTT; QNT; Quan; Quant; Quantitative; Random; Surf; Tilt tube; Time ratio

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 after addition of protein C activator+Factor V depleted plasma/Coagulation surface induced Coag (PPP) [Time ratio]aPTT in Platelet poor plasma by Coagulation assay -- after addition of protein C activator + Factor V depleted plasma/aPTTaPTT protein C activator+FV DP/aPTT PPPCoagulation surface induced^after addition of protein C activator+Factor V depleted plasma/Coagulation surface inducedCOAGaPTT after addition of Protein C Activator+Factor V Depleted Plasma/Coagulation Surface Induced, BloodTRto

Frequently asked questions

Code details

Code52766-3

SystemLOINC

Display nameaPTT after addition of protein C activator+Factor V depleted plasma/Coagulation surface induced Coag (PPP) [Time ratio]

DescriptionCoagulation surface induced^after addition of protein C activator+Factor V depleted plasma/Coagulation surface induced

Short nameaPTT protein C activator+FV DP/aPTT PPP

ComponentCoagulation surface induced^after addition of protein C activator+Factor V depleted plasma/Coagulation surface induced

PropertyTRto

TimingPt

System (specimen)PPP

ScaleQn

MethodCoag

ClassCOAG

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.24

Last changed2.73

Consumer names

aPTT after addition of Protein C Activator+Factor V Depleted Plasma/Coagulation Surface Induced, Blood

Part names

Coagulation surface induced^after addition of protein C activator+factor V depleted plasma/Coagulation surface inducedTRtoPtPPPQnCoagProtein C+Coagulation factor V activity-dependent clotting timeTime RatioPoint in time (spot)Platelet poor 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.