Complement, Total (CH50)

Label Mnemonic:	CH50
Epic code:	LAB154
Downtime form:	A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery

Commercial Mailout Laboratory
6240-8 RCP
356-8593

Specimen(s):

Serum

Specimen Instructions:

Allow specimen to clot for one hour at room temperature. Separate serum from cells ASAP or within 2 hours of collection.

Separate specimens must be submitted when multiple tests are ordered.

Collection Medium:

Red top tube 5 mL (Clot Activator)

Minimum:

Preferred Minimum: 1.0 mL serum
Absolute Minimum: 0.5 mL serum

Rejection Criteria:

Separator tubes. Specimens left to clot at 2-8°C. Specimens exposed to repeated freeze/thaw cycles. Non-frozen specimens. Grossly hemolyzed or severely lipemic specimens.

Delivery Instructions:

Deliver to laboratory immediately after collection. Critical frozen.

Testing Schedule:

Sunday-Saturday

Turn Around Time:

1-2 days upon receipt at reference laboratory

Reference Range:

Low	38.6 U/mL or less
Normal	38.7-89.9 U/mL
High	90.0 U/mL or greater

Comments:

Initial screening for suspected deficiency in the classical complement pathway.

Methodology:

Quantitative Immunoturbidimetry

CPT Code:

86162

See Additional Information:
Specimens Requiring Immediate Delivery