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LOINC Code 45388-6: Calcium phosphate crystals LM.LPF (Urine sed) [#/Area]

45388-6 is a LOINC code used to identify Calcium phosphate crystals LM.LPF (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 Calcium phosphate crystals. It is commonly used with the system or sample type Urine sed.

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 Calcium phosphate 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.LPF

What it does not mean

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

Key facts

  • Calcium phosphate crystals [#/area] in Urine sediment by Microscopy low power field
  • Calcium phosphate crystals
  • #/area; Ca; Ca Phos; Ca Phos Cry; Cal; CAP; Crys; Cryst; Crystal; i Phos; Inorganic phosphate; Kidney; LM; Micro; Micros; Microscopic; Nephrology; Number areic; Phos; Phosphate total; Phosphorous; Phosphorus; Phosphrous; Pi; PO4; Point in time; QNT; Quan; Quant; Quantitative; Random; Renal; 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

Calcium phosphate crystals LM.LPF (Urine sed) [#/Area]Calcium phosphate crystals [#/area] in Urine sediment by Microscopy low power fieldCa Phos Cry #/area UrnS LPFCalcium phosphate crystalsUACalcium phosphate crystals, Urine sedimentNaric

Frequently asked questions

Code details

Code45388-6
SystemLOINC
Display nameCalcium phosphate crystals LM.LPF (Urine sed) [#/Area]
DescriptionCalcium phosphate crystals
Short nameCa Phos Cry #/area UrnS LPF
ComponentCalcium phosphate crystals
PropertyNaric
TimingPt
System (specimen)Urine sed
ScaleQn
MethodMicroscopy.light.LPF
ClassUA
Example units/LPF
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.17
Last changed2.73

Consumer names

Calcium phosphate crystals, Urine sediment

Part names

Calcium phosphate crystalsNaricPtUrine sedQnMicroscopy.light.LPFNumber Areic (per area)Point in time (spot)Urine sedimentMicroscopy low 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.