Factor H Level

B-1H, Radial Immuno Assay, RIA

Test Codes

Order Reference Lab Miscellaneous Send Out: EPIC: LAB848, Beaker: Ref. Lab. Misc., National Jewish Health (NJH): FHL

Department

Send Outs

Specimen Collection Criteria

Collect: One Lavender-top EDTA tube.

Critical frozen. Send specimen for processing immediately after collection.

Physician Office/Draw Specimen Preparation

Critical frozen. Centrifuge to separate plasma from cells within 30 minutes of collection. Transfer plasma to a plastic transport tube and freeze (-20°C/-4°F or below) immediately.

Preparation for Courier Transport

Transport: 1.0 mL plasma, frozen (-20°C/-4°F or below). (Minimum: 0.25 mL)

Rejection Criteria

• Serum specimens.
• Specimens not collected and processed as indicated.

In-Lab Processing

Critical frozen. Centrifuge to separate plasma from cells within 30 minutes of collection. Transfer plasma to a plastic transport tube and freeze (-20°C/-4°F or below) immediately.

Transport: 1.0 mL plasma, frozen (-20°C/-4°F or below). (Minimum: 0.25 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): Unacceptable
Refrigerated (2-8°C or 36-46°F): Unacceptable
Frozen (-20°C/-4°F or below): 1 year

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to National Jewish Health, Denver, CO.

Performed

Monday – Friday.
Results available in 30 days.

Reference Range

160 - 412 mcg/mL.

Test Methodology

Radial Immunodiffusion (RID)

Interpretation

By report.

CPT Codes

86160

Contacts

Last Updated

8/6/2026