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Test Code MRA Culture and Sensitivity, Respiratory

Additional Codes

Epic Ordering Code LAB267
NBS code LBC04879
Service code 23041

 

Specimen Requirements

Submit only one of the following

Preferred:  
White sterile container Eswab

Specimen Type: Sputum, ETT aspirate, tracheal aspirate, BAL
Container/Tube: Sterile screw-capped container
Volume: 2.0 mL
Minimum Volume: 0.5 mL
 

Collection Instructions:

Sputum:

  • Rinse mouth with water to remove food particles.
  • Collect 4 to 5 deep coughs into a sterile container.
  • Do not send saliva.
  • Cap container tightly, label, and send to the laboratory immediately.
  • Sputum quality will be assessed with a Gram smear. Specimens heavily contaminated with oral flora will be rejected.

BAL: BAL fluid is preferred to bronchial washings for bacterial culture.
 

Please indicate if extended incubation is required when slow growing bacteria such as Nocardia, Actinomyces are suspected.

 

Specimen Type: Nasal swab
Container/Tube: eSwab, M40 transystem Amies agar transport media (for non-NUH patients)
Volume: 1 swab
Collection Instructions: Insert a sterile swab into the nose approximately 2.5 cm and rotate the swab against the anterior nares. Place swab in transport medium.

Please refer to eSwab Training Slides.

 

Specimen Type: Throat swab
Container/Tube: eSwab, M40 transystem Amies agar transport media (for non-NUH patients)
Volume: 1 swab
Collection Instructions: Sample only areas of exudate, membrane formation, inflammation or tonsillar crypts. Avoid touching the tongue or other mucous surfaces.

Please refer to eSwab Training Slides.

Specimen Stability and Condition

Specimen Type All types
Transport Condition Submit sample to lab immediately (ambient)
Refrigerate

Acceptable up to 1 day 

(Some groups of bacteria may be lost when refrigerated)

Unacceptable condition Gastric aspirate, nasopharyngeal aspirate are not acceptable for bacterial culture.
Special instructions A Gram smear must be ordered for Sputum and ETT aspirate.

 

Methodology

Conventional Culture

Days and Times Performed

Monday through Sunday, TAT 1-6 days

Reference Interval

No growth of respiratory pathogens.

Testing Laboratory

National University Hospital

Clinical Microbiology, 67724343

Useful For

Diagnosis of respiratory tract infections.

Update

Last updated 28/7/2026

LOINC Code Information

32355-0