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Test Code AH50 Alternative Complement Pathway, Functional, Serum

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Reporting Name

Alternative Complement Path Func, S

Specimen Type

Serum


Ordering Guidance


COM / Complement, Total, Serum and this test are the most appropriate primary assays to use as screening methods for complement deficiencies. Abnormal results in one or the other, neither or both assays will help direct further testing.

 

This test is rarely useful when ordered in isolation.



Specimen Required


Patient Preparation: Fasting preferred

Supplies: Sarstedt Aliquot Tube, 5 mL (T914)

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions:

1. Immediately after specimen collection, place the tube on wet ice and allow specimen to clot.

2. Centrifuge at 4° C and aliquot serum into a plastic vial.

3. Freeze specimen within 30 minutes of centrifugation. Sample must be placed on dry ice if not frozen immediately.

NOTE: If a refrigerated centrifuge is not available, it is acceptable to use a room temperature centrifuge, provided the specimen is kept on ice before centrifugation, and immediately afterward, the serum aliquoted and frozen.


Reject Due To

Gross hemolysis OK
Gross lipemia OK
Gross icterus OK

Specimen Stability Information

Specimen Type Temperature Time
Serum Frozen 14 days

Specimen Minimum Volume

0.75 mL

Day(s) Performed

Varies

Specimen Retention Time

14 days

Report Available

3 to 5 days

Reference Values

≥46% normal

Useful For

Investigation of suspected alternative pathway complement deficiency, atypical hemolytic uremic syndrome, C3 glomerulonephritis, and dense-deposit disease

CPT Code Information

86161

LOINC Code Information

Test ID Test Order Name Order LOINC Value
AH50 Alternative Complement Path Func, S 74520-8

 

Result ID Test Result Name Result LOINC Value
88676 Alternative Complement Path Func, S 74520-8

Forms

If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.