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LOINC Code 74318-7: PRRSV North American strain RNA NAA+probe (Specimen) [ThreshNum]

74318-7 is a LOINC code used to identify PRRSV North American strain RNA NAA+probe (Specimen) [ThreshNum] 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 Porcine reproductive and respiratory syndrome virus North American strain RNA. It is commonly used with the system or sample type XXX.

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 Porcine reproductive and respiratory syndrome virus North American strain RNA. It is commonly used with the system or sample type XXX.

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
  • Method: Probe.amp.tar

What it does not mean

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

Key facts

  • PRRSV North American strain RNA [Cycle Threshold #] in Specimen by NAA with probe detection
  • Porcine reproductive and respiratory syndrome virus North American strain RNA
  • Real-time reverse transcriptase PCR targeting Porcine reproductive and respiratory syndrome virus (PRRSV) North American strain RNA and reported as cross threshold (Ct) value. The submitter's lab uses primers and probes tuned to the North American strains for comparison to the European strains.
  • 3 Self-Sustaining Sequence Replication; 3SR SR; Abortus blauw; Amplif; Amplification; Amplified; Blue-eared pig disease; DNA NUCLEIC ACID PROBE; DNA probe; LAT; LCR; Lelystad virus; Ligase chain reaction; Ligation-activated transcription; Microbiology; Misc; Miscellaneous; Mystery swine disease; NAA+probe; NAAT; NASBA; Nucleic acid sequence based analysis; Other; PCR; Point in time; Polymerase chain reaction; Porcine epidemic abortion & respiratory syndrome; Porcine reproductive and respiratory syndrome; Pork; Probe amp; Probe with ampification; Probe with target amplification; PRRS; PRRSV; PRRSV NA strain; PRRSV NA strain RNA; QBR; QNT; Quan; Quant; Quantitative; Random; Ribonucleic acid; SDA; Seuchenhafter spatabort der schweine; SIRSV; Spec; Strand Displacement Amplification; Swine; Swine infertility and respiratory syndrome; Syndrome dysgenesique et respiratoire porcin; TMA; To be specified in another part of the message; Transcription mediated amplification; Unspecified; Vet; Veterinary

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

PRRSV North American strain RNA NAA+probe (Specimen) [ThreshNum]PRRSV North American strain RNA [Cycle Threshold #] in Specimen by NAA with probe detectionPRRSV NA strain RNA Ct Spec Qn NAA+probePorcine reproductive and respiratory syndrome virus North American strain RNAMICROPRRSV North american strain, SpecimenThreshNum

Frequently asked questions

Code details

Code74318-7
SystemLOINC
Display namePRRSV North American strain RNA NAA+probe (Specimen) [ThreshNum]
DescriptionPorcine reproductive and respiratory syndrome virus North American strain RNA
Short namePRRSV NA strain RNA Ct Spec Qn NAA+probe
ComponentPorcine reproductive and respiratory syndrome virus North American strain RNA
PropertyThreshNum
TimingPt
System (specimen)XXX
ScaleQn
MethodProbe.amp.tar
ClassMICRO
Example unitsCt
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.46
Last changed2.69

Consumer names

PRRSV North american strain, Specimen

Part names

Porcine reproductive and respiratory syndrome virus North American strain RNAThreshNumPtXXXQnProbe.amp.tarPRRSV North American strain RNAPoint in time (spot)Nucleic acid amplification with probe detection

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.