Apr 6, 2015




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Ref Lab- Miscellaneous

Histoplasma Ag

Histoplasma Ag (HCHISTAG) Ref Lab- Miscellaneous Lab Test

Name: Histoplasma Ag

Test Name: Histoplasma Ag

Health Link Test Code: HCHISTAG


CPT Code(s): 87385

Methodology: Enzyme Immunoassay

Clinical Information:

May be used as an aid in rapid diagnosis of disseminated or acute pulmonary histoplasmosis. This assay detects Histoplasma capsulatum antigen.

Testing Site: Testing will be sent to an approved reference laboratory

Days Performed: Mon-Fri.

In-Lab Turnaround Time: 1 week.

Collection Instructions:

Specimen Container Minimum Volume
BAL Sterile screw cap container 0.5 mL
Blood 9 mL red or green top tube 1.2 mL serum
Body Fluid Sterile screw cap container 0.5 mL

Numbered specimen tube from sterile

disposable lumbar puncture tray

0.8 mL
Urine Sterile screw cap container 0.5 mL

Stability Ambient:

7 days

Stability Refridgerated:

30 days

Stability Frozen:


Testing Volume: 4 mL

Pediatric Testing Volume: 2 mL

Specimen Processing:

Blood: Centrifuge. Transfer cell-free serum to plastic vial.Refrigerate.


Other specimen types: Refrigerate.

Specimen Transport:

Transport specimen to UWHC Hospital Laboratory. Transport with coolant pack if coming from clinic location.

Test Limitations:

Cross reactions may occur with blastomycosis, coccidioidomycosis, paracoccidioidomycosis,  and penicilliosis marneffei, and rarely in aspergillosis.


Sputolysin and NaOH are both interfering substances.