What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveObservation

LOINC Code 51213-7: Acetaminophen crystals LM.HPF (Urine sed) [#/Area]

Name: LOINC Code 51213-7: Acetaminophen crystals LM.HPF (Urine sed) [#/Area]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:35.011Z

51213-7 is a LOINC code used to identify Acetaminophen crystals LM.HPF (Urine sed) [#/Area] 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 Acetaminophen crystals. It is commonly used with the system or sample type Urine sed.

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 Acetaminophen crystals. It is commonly used with the system or sample type Urine sed.

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: Microscopy.light.HPF

What it does not mean

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

Key facts

Acetaminophen crystals [#/area] in Urine sediment by Microscopy high power field
Acetaminophen crystals
#/area; ACET; Acetamidophenol; Acetamin Cry; Acetaminoph; Acetominophen; APAP; c209; C55; Crys; Cryst; Crystal; Hydroxyacetanilide; Kidney; LM; Micro; Micros; Microscopic; N-(4-Hydroxyphenyl)acetanilide; N-Acetyl-p-aminophenol; Nephrology; Number areic; p-Acetamidophenol; Paracetamol; p-Hydroxyacetanilide; Point in time; QNT; Quan; Quant; Quantitative; Random; Renal; Tylenol; u209; UA; UR; URINALYSIS; Urine sediment; Urn; UrnS

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

Acetaminophen crystals LM.HPF (Urine sed) [#/Area]Acetaminophen crystals [#/area] in Urine sediment by Microscopy high power fieldAcetamin Cry #/area UrnS HPFAcetaminophen crystalsUAAcetaminophen crystals, Urine sedimentNaric

Frequently asked questions

Code details

Code51213-7

SystemLOINC

Display nameAcetaminophen crystals LM.HPF (Urine sed) [#/Area]

DescriptionAcetaminophen crystals

Short nameAcetamin Cry #/area UrnS HPF

ComponentAcetaminophen crystals

PropertyNaric

TimingPt

System (specimen)Urine sed

ScaleQn

MethodMicroscopy.light.HPF

ClassUA

Example units/HPF

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.70

Consumer names

Acetaminophen crystals, Urine sediment

Part names

Acetaminophen crystalsNaricPtUrine sedQnMicroscopy.light.HPFNumber Areic (per area)Point in time (spot)Urine sedimentMicroscopy high power field

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.