Atypical Hemolytic Uremic Syndrome complement panel, serum and plasma-994

Test info

  
Atypical Hemolytic Uremic Syndrome complement panel, serum and plasma
  
994
  
LAB994
  
MSO
  
aHUS
HUS
  
  • Detecting deficiencies in the alternative pathway that can cause atypical-hemolytic uremic syndrome, dense deposit disease, and C3 glomerulonephritis
  • A second-order test that aids in the differential diagnosis of thrombotic microangiopathies

 

Specimen

  
  • Fasting preferred
  • Samples should not be collected earlier than 48 hours following plasma exchange
  
Sodium citrate (Na cit) plasma AND serum
  
1.5 mL Na Cit plasma AND 1.5 mL serum
  
1.0 mL each (Na cit plasma and serum)
  
  • Samples should not be drawn earlier than 48 hours following plasma exchange
  • Draw on ice
  
  1. Spin cold
  2. Transfer serum and plasma to two (2) Screw cap transfer vial/tubes (Mayo T465)
  3. Freeze  within 30 minutes
  

Two (2) Screw cap transfer vial/tube (Mayo T465) (2), labeled as serum and Na cit plasma

  

Frozen (strict) - 14 days

  
  • Gel separator/SST tubes are not acceptable

Performance

  
Mayo Clinic Laboratories (AHUSD): R-NX
  
Varies
  
7 - 21 days
  

C3HUS, C4HUS, FBCA, FHCA, C5AG2: Nephelometry

COM3: Automated Liposome Lysis Assay

AH503, C4D, CBB, SC5B9: Enzyme-Linked Immunosorbent Assay (ELISA)

Clinical and Interpretive info

  

An interpretive report will be included

Factor B complement Ag:                                     15.2-42.3 mg/dL
SC5b-9 complement:                                                  ≤250 ng/mL
Factor H complement Ag:                                     23.6-43.1 mg/dL
C4d complement activation fragment:                          ≤9.8 μg/mL
CBb complement activation fragment:                          ≤1.6 μg/mL
Complement C4:                                                        14-40 mg/dL
Complement C3:                                                       75-175 mg/dL
Complement, alternate pathway (AH50), functional:      ≥46% normal
Complement, total:                                                      30-75 U/mL

Reference values have not been established for patients who are <16 years of age.

Billing

  
86160 x 7
86161
86162

Tracking

  
09/04/2019
  
09/04/2019