LOINCActiveObservation

LOINC Code 943-1: C Ab Ql (S/P BPU)

943-1 is a LOINC code used to identify C Ab Ql (S/P BPU) 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 C Ab. It is commonly used with the system or sample type Ser/Plas^BPU.

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 C Ab. It is commonly used with the system or sample type Ser/Plas^BPU.

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

What it does not mean

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

Key facts

  • C Ab [Presence] in Serum or Plasma from Blood product unit
  • C Ab
  • ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; BLOOD BANK; Blood product unit; Blood Product Unit (Pack); Ordinal; Pl; Plasma; Plsm; Point in time; PR; QL; Qual; Qualitative; Random; Rh Blood Group System; Screen; SerP; SerPl; SerPl^bpu; SerPlas; Serum; Serum or plasma; SR

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

C Ab Ql (S/P BPU)C Ab [Presence] in Serum or Plasma from Blood product unitC Ab SerPl BPU QlC AbBLDBKC antibody, Blood Product UnitPrThr

Frequently asked questions

Code details

Code943-1
SystemLOINC
Display nameC Ab Ql (S/P BPU)
DescriptionC Ab
Short nameC Ab SerPl BPU Ql
ComponentC Ab
PropertyPrThr
TimingPt
System (specimen)Ser/Plas^BPU
ScaleOrd
ClassBLDBK
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0
Last changed2.73

Consumer names

C antibody, Blood Product Unit

Part names

C AbPrThrPtSer/Plas^BPUOrdPresence or ThresholdPoint in time (spot)Serum or Plasma^BPU

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 943-1 | HealthAssure