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 28659-1: Prekallikrein (Fletcher Factor) actual/normal Chromogenic method (PPP) [Rel catalytic activity/Vol]

Name: LOINC Code 28659-1: Prekallikrein (Fletcher Factor) actual/normal Chromogenic method (PPP) [Rel catalytic activity/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:15.023Z

28659-1 is a LOINC code used to identify Prekallikrein (Fletcher Factor) actual/normal Chromogenic method (PPP) [Rel catalytic activity/Vol] 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 Prekallikrein actual/Normal. 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 Prekallikrein actual/Normal. 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: Chromo

What it does not mean

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

Key facts

Prekallikrein (Fletcher Factor) actual/normal in Platelet poor plasma by Chromogenic method
Prekallikrein actual/Normal
Act/Nor; Chromogenic assay; COAGULATION; Control; ENZY; Enzymatic assay; Fletcher factor; Hematology; Heme; PK; Plas; Platelet poor plasma; Point in time; Prokallikrein; Prokinogenase; QNT; Quan; Quant; Quantitative; Random; RlCCnc

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

Prekallikrein (Fletcher Factor) actual/normal Chromogenic method (PPP) [Rel catalytic activity/Vol]Prekallikrein (Fletcher Factor) actual/normal in Platelet poor plasma by Chromogenic methodPK Act/Nor PPP ChroPrekallikrein actual/NormalCOAGPrekallikrein (Fletcher Factor) actual/normal, BloodRelCCnc

Frequently asked questions

Code details

Code28659-1

SystemLOINC

Display namePrekallikrein (Fletcher Factor) actual/normal Chromogenic method (PPP) [Rel catalytic activity/Vol]

DescriptionPrekallikrein actual/Normal

Short namePK Act/Nor PPP Chro

ComponentPrekallikrein actual/Normal

PropertyRelCCnc

TimingPt

System (specimen)PPP

ScaleQn

MethodChromo

ClassCOAG

Example units%

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.00

Last changed2.73

Consumer names

Prekallikrein (Fletcher Factor) actual/normal, Blood

Part names

Prekallikrein actual/NormalRelCCncPtPPPQnChromoRelative catalytic concentrationPoint in time (spot)Platelet poor plasmaChromogenic (Enzyme)

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.