LOINCActiveObservation

LOINC Code 51649-2: HCV c100p+5-1-1 Ab IB Ql (S)

51649-2 is a LOINC code used to identify HCV c100p+5-1-1 Ab IB Ql (S) 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 Hepatitis C virus c100p+5-1-1 Ab. It is commonly used with the system or sample type Ser.

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 Hepatitis C virus c100p+5-1-1 Ab. It is commonly used with the system or sample type Ser.

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: IB

What it does not mean

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

Key facts

  • Hepatitis C virus c100p+5-1-1 Ab [Presence] in Serum by Immunoblot
  • Hepatitis C virus c100p+5-1-1 Ab
  • ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Blt; HCV; HCV c100p+5-1-1; Hep; Hep C; Hepatis; Hepatit; Hepatology; i; ID; IMMUNE BLOT; Immunobl; Immunoblot; Infectious Disease; InfectiousDisease; Liver; Microbiology; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; RIBA; Screen; Serum; SR; WB; WBLOT; West blot; West blt; Western blot

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

HCV c100p+5-1-1 Ab IB Ql (S)Hepatitis C virus c100p+5-1-1 Ab [Presence] in Serum by ImmunoblotHCV c100p+5-1-1 Ab Ser Ql IBHepatitis C virus c100p+5-1-1 AbMICROHepatitis C virus (HCV) C100p+5-1-1 antibody, BloodPrThr

Frequently asked questions

Code details

Code51649-2
SystemLOINC
Display nameHCV c100p+5-1-1 Ab IB Ql (S)
DescriptionHepatitis C virus c100p+5-1-1 Ab
Short nameHCV c100p+5-1-1 Ab Ser Ql IB
ComponentHepatitis C virus c100p+5-1-1 Ab
PropertyPrThr
TimingPt
System (specimen)Ser
ScaleOrd
MethodIB
ClassMICRO
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.24
Last changed2.73

Consumer names

Hepatitis C virus (HCV) C100p+5-1-1 antibody, Blood

Part names

Hepatitis C virus c100p+5-1-1 AbPrThrPtSerOrdIBPresence or ThresholdPoint in time (spot)SerumImmunoblot

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 51649-2 | HealthAssure