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 77161-8: Prothrombin activity immediately after addition of factor II depleted plasma Coag Qn (PPP)

Name: LOINC Code 77161-8: Prothrombin activity immediately after addition of factor II depleted plasma Coag Qn (PPP)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:57.647Z

77161-8 is a LOINC code used to identify Prothrombin activity immediately after addition of factor II depleted plasma Coag Qn (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 Prothrombin.activity^immediately after addition of factor II depleted plasma. 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 Prothrombin.activity^immediately after addition of factor II depleted plasma. 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

Prothrombin activity [Units/volume] in Platelet poor plasma by Coagulation assay --immediately after addition of factor II depleted plasma

Prothrombin.activity^immediately after addition of factor II depleted plasma

Tests for congenital or secondary deficiency of prothrombin (also called FII or factor II) by measuring prothrombin activity in patient plasma using a modified prothrombin time test (PT). Patient plasma is diluted and then added to a plasma deficient in prothrombin. Correction of the clotting time of the deficient plasma is proportional to the concentration (% activity) of that factor in the patient plasma, interpolated from a calibration curve. Prothrombin is a vitamin-K dependent plasma protein made in the liver and circulated in plasma. Congenital deficiency is very rare and usually causes minor bleeding. Secondary disorders are liver diseases, hyperfibrinolysis, disseminated intravascular coagulation (DIC), oral anticoagulant therapy, or vitamin-K deficiency. This term was created for, but not limited in use to, the HemolL Factor II deficient plasma test kit. Results may be expressed in % activity, IU/ml, or seconds.

2; Activ; Actvty; Arbitrary concentration; Clot; Clottable; COAGULATION; Coagulation assay; Coagulation factor II; Fac; Fact; Factor 2; Factor II; Factor II activity; FII; FII activity; Hematology; Heme; imm FII DP; Immediatedly after 11 addition of; Movements; Plas; Platelet poor plasma; Point in time; Prothombin; Prothrm; Prothromb; QNT; Quan; Quant; Quantitative; Random; 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

Prothrombin activity immediately after addition of factor II depleted plasma Coag Qn (PPP)Prothrombin activity [Units/volume] in Platelet poor plasma by Coagulation assay --immediately after addition of factor II depleted plasmaProthrom imm FII DP PPP-aCncProthrombin.activity^immediately after addition of factor II depleted plasmaCOAGProthrombin activity immediately after addition of Factor II Depleted Plasma, BloodACnc

Frequently asked questions

Code details

Code77161-8

SystemLOINC

Display nameProthrombin activity immediately after addition of factor II depleted plasma Coag Qn (PPP)

DescriptionProthrombin.activity^immediately after addition of factor II depleted plasma

Short nameProthrom imm FII DP PPP-aCnc

ComponentProthrombin.activity^immediately after addition of factor II depleted plasma

PropertyACnc

TimingPt

System (specimen)PPP

ScaleQn

MethodCoag

ClassCOAG

Example unitsIU/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.52

Last changed2.52

Consumer names

Prothrombin activity immediately after addition of Factor II Depleted Plasma, Blood

Part names

Prothrombin.activity^immediately after addition of factor II depleted plasmaACncPtPPPQnCoagArbitrary ConcentrationPoint 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.