LOINCActiveObservation

LOINC Code 2550-2: Lactate/Pyruvate (Bld) [Molar ratio]

2550-2 is a LOINC code used to identify Lactate/Pyruvate (Bld) [Molar 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 Lactate/Pyruvate. It is commonly used with the system or sample type Bld.

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 Lactate/Pyruvate. It is commonly used with the system or sample type Bld.

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

  • Lactate/Pyruvate [Molar ratio] in Blood
  • Lactate/Pyruvate
  • 2-Hydroxypropanoic acid; 2-hydroxy-propionate; 2-hydroxy-propionic acid; Blood; Chemistry; Lact; Lactic acid; L-lactate; Point in time; Pyruvic acid; QNT; Quan; Quant; Quantitative; Random; Scrto; Substance concentration ratio; Substance ratio; WB; Whole blood

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

Lactate/Pyruvate (Bld) [Molar ratio]Lactate/Pyruvate [Molar ratio] in BloodLactate/Pyruvate Bld-sRtoLactate/PyruvateCHEMLactate/Pyruvate, BloodSRto

Frequently asked questions

Code details

Code2550-2
SystemLOINC
Display nameLactate/Pyruvate (Bld) [Molar ratio]
DescriptionLactate/Pyruvate
Short nameLactate/Pyruvate Bld-sRto
ComponentLactate/Pyruvate
PropertySRto
TimingPt
System (specimen)Bld
ScaleQn
ClassCHEM
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

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

Consumer names

Lactate/Pyruvate, Blood

Part names

Lactate/PyruvateSRtoPtBldQnSubstance RatioPoint in time (spot)Blood

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 2550-2 | HealthAssure