LOINCActiveObservation

LOINC Code 1345-8: Yt sup(a) Ag Ql (RBC BPU)

1345-8 is a LOINC code used to identify Yt sup(a) Ag Ql (RBC 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 Y little t super little a Ag. It is commonly used with the system or sample type RBC^BPU.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Y little t super little a Ag. It is commonly used with the system or sample type RBC^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

  • Yt sup(a) Ag [Presence] on Red Blood Cells from Blood product unit
  • Y little t super little a Ag
  • Antigen; Antigens; BLOOD BANK; Blood product unit; Blood Product Unit (Pack); Erythrocytes; Hematology; Heme; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Red blood cells; Red blood corpusles; Screen; T prime; Y (little t) (little a); Yt sup(a); Yt^a

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

Yt sup(a) Ag Ql (RBC BPU)Yt sup(a) Ag [Presence] on Red Blood Cells from Blood product unitYt sup(a) Ag RBC BPU QlY little t super little a AgBLDBKYt sup(a) antigen, Blood Product UnitPrThr

Frequently asked questions

Code details

Code1345-8
SystemLOINC
Display nameYt sup(a) Ag Ql (RBC BPU)
DescriptionY little t super little a Ag
Short nameYt sup(a) Ag RBC BPU Ql
ComponentY little t super little a Ag
PropertyPrThr
TimingPt
System (specimen)RBC^BPU
ScaleOrd
ClassBLDBK
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

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

Consumer names

Yt sup(a) antigen, Blood Product Unit

Part names

Y little t super little a AgPrThrPtRBC^BPUOrdYt^a AgPresence or ThresholdPoint in time (spot)

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 1345-8 | HealthAssure