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LOINC Code 16258-6: Ammonium urate crystals Infrared spectroscopy Ql (Stone)

16258-6 is a LOINC code used to identify Ammonium urate crystals Infrared spectroscopy Ql (Stone) 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 Ammonium urate crystals. It is commonly used with the system or sample type Calculus.

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 Ammonium urate crystals. It is commonly used with the system or sample type Calculus.

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
  • Method: Infrared spectroscopy

What it does not mean

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

Key facts

  • Ammonium urate crystals [Presence] in Stone by Infrared spectroscopy
  • Ammonium urate crystals
  • Amm; Amm Urate; Amm Urate Cry; Ammon; Ammonium acid urate; Ammonium biurate; Calc; Calculi; Chemistry; Crys; Cryst; Crystal; Infared spectoscopy; IR; NH4; NH4U; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Stn; Stone; Stones; UA; Urates; Uric acid

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

Ammonium urate crystals Infrared spectroscopy Ql (Stone)Ammonium urate crystals [Presence] in Stone by Infrared spectroscopyAmm Urate Cry Stone Ql IRAmmonium urate crystalsCHEMAmmonium urate crystals, StonePrThr

Frequently asked questions

Code details

Code16258-6
SystemLOINC
Display nameAmmonium urate crystals Infrared spectroscopy Ql (Stone)
DescriptionAmmonium urate crystals
Short nameAmm Urate Cry Stone Ql IR
ComponentAmmonium urate crystals
PropertyPrThr
TimingPt
System (specimen)Calculus
ScaleOrd
MethodInfrared spectroscopy
ClassCHEM
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

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

Consumer names

Ammonium urate crystals, Stone

Part names

Ammonium urate crystalsPrThrPtCalculusOrdInfrared spectroscopyPresence or ThresholdPoint in time (spot)Calculus (stone)

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 16258-6 | HealthAssure