Eosinophil Count, Nasal

Message

DO NOT SEND SWAB TO QUEST. PLEASE GIVE THE SPECIMEN TO CORE LAB TO MAKE THE SLIDES.

Test Code

EOSNASALQ

Quest Code

426

CPT Codes
89190

Preferred Specimen

2 air-dried nasal smears submitted in a slide holder

Patient Preparation
Collect specimen with a Nasal Swab.

Minimum Volume

1 slide

Other Acceptable Specimens

Nasal smears

Transport Container

Slide Holder

Transport Temperature

Room temperature

Specimen Stability

Room temperature: Indefinitely
Refrigerated: Unacceptable
Frozen: Unacceptable

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Poor smear quality

Methodology
Microscopic Examination/Wright's Stain

Setup Schedule

Monday-Saturday All Shifts Report available: Next Day

Reference Range

≤2 % eos

Clinical Significance

Screening test to aid in diagnosis of allergic rhinitis.

Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

Last Updated: July 21, 2025

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.