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LOINC Code 80737-0: Calculated panel reactive antibody Calc (S) [Relative ratio]

80737-0 is a LOINC code used to identify Calculated panel reactive antibody Calc (S) [Relative ratio] 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 Calculated panel reactive antibody. 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 Calculated panel reactive antibody. 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: Both
  • Method: Calculated

What it does not mean

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

Key facts

Calculated panel reactive antibody - Serum
Calculated panel reactive antibody
A patient's "calculated panel reactive antibody" (cPRA) determines the likelihood that a transplant recipient and donor would be incompatible. The cPRA is calculated based on how many and which HLA antibodies the patient has compared to known information about the HLA antigen frequencies from ~1200 donors from 2003-2005.[PMID19958328] The more antibodies the patient has and the more common the HLA antigens are in the donor pool, the higher the cPRA. Calculated cPRA is not the same as a patient's percent PRA, which is simply the percentage of a pool of donors (~100) to which a patient had reactive antibodies (see the HLA Ab panel [LOINC: 46993-2]). Note that "panel" is part of the antibody name and a single result is expected. This is not panel term.
Ab; Calc; Calculation; cPRA; HLA ANTIGEN; Human Leukocyte Antigen; Pan; Panl; Pnl; Point in time; QNT; Quan; Quant; Quantitative; Random; Reac; React; Relative ratio; Serum; 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

Calculated panel reactive antibody Calc (S) [Relative ratio]Calculated panel reactive antibody - SerumcPRA Ser CalcCalculated panel reactive antibodyHLACalculated panel reactive antibody, BloodRelRto

Frequently asked questions

Code details

Code80737-0
SystemLOINC
Display nameCalculated panel reactive antibody Calc (S) [Relative ratio]
DescriptionCalculated panel reactive antibody
Short namecPRA Ser Calc
ComponentCalculated panel reactive antibody
PropertyRelRto
TimingPt
System (specimen)Ser
ScaleQn
MethodCalculated
ClassHLA
Example unitsratio
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.56
Last changed2.65

Consumer names

Calculated panel reactive antibody, Blood

Part names

Calculated panel reactive antibodyRelRtoPtSerQnCalculatedRelative RatioPoint in time (spot)Serum

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.