LOINCActiveBoth

LOINC Code 74899-6: Lactulose/Mannitol post Unsp g sugar solution PO (5 hour U) [Molar ratio]

74899-6 is a LOINC code used to identify Lactulose/Mannitol post Unsp g sugar solution PO (5 hour U) [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 Lactulose/mannitol^post XXX g sugar solution PO. It is commonly used with the system or sample type Urine.

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 Lactulose/mannitol^post XXX g sugar solution PO. It is commonly used with the system or sample type Urine.

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

What it does not mean

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

Key facts

Lactulose/Mannitol [Molar ratio] in 5 hour Urine --post XXX g sugar solution PO
Lactulose/mannitol^post XXX g sugar solution PO
The ratio of lactulose to mannitol percent recovery in urine collected for 5 hours after oral ingestion of a sugar solution. These results are part of a sugar solution test used as a diagnostic aid for a variety of gastrointestinal diseases and evaluation of therapeutic interventions in both children and adults. [PMID7714684]
5 hours; 5.0Hr; 5HR; After; Chemistry; p sug sol; PST; QNT; Quan; Quant; Quantitative; Scrto; Substance concentration ratio; Substance ratio; UA; UR; Urn

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

Lactulose/Mannitol post Unsp g sugar solution PO (5 hour U) [Molar ratio]Lactulose/Mannitol [Molar ratio] in 5 hour Urine --post XXX g sugar solution POLactulose/Mannitol p sug sol 5h Ur-sRtoLactulose/mannitol^post XXX g sugar solution POCHEMLactulose/Mannitol after Unsp g Sugar Solution by mouth, UrineSRto

Frequently asked questions

Code details

Code74899-6
SystemLOINC
Display nameLactulose/Mannitol post Unsp g sugar solution PO (5 hour U) [Molar ratio]
DescriptionLactulose/mannitol^post XXX g sugar solution PO
Short nameLactulose/Mannitol p sug sol 5h Ur-sRto
ComponentLactulose/mannitol^post XXX g sugar solution PO
PropertySRto
Timing5H
System (specimen)Urine
ScaleQn
ClassCHEM
Example unitsratio
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.48
Last changed2.54

Consumer names

Lactulose/Mannitol after Unsp g Sugar Solution by mouth, Urine

Part names

Lactulose/mannitol^post XXX g sugar solution POSRto5HUrineQnSubstance Ratio5 hours

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.