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Test Code OXYBS Oxysterols, Blood Spot


Ordering Guidance


Based on internal validation studies, this test using dried blood spots is less clinically sensitive and specific for diagnosing Niemann-Pick type C (NPC) (75% and 89%, respectively) than using plasma (98%). If there is a strong clinical suspicion for NPC, order OXNP / Oxysterols, Plasma.

 

This test is also available as a part of a panel; see HSMBS / Hepatosplenomegaly Panel, Blood Spot. If this test (OXYBS) is ordered with either GPSY / Glucopsychosine, Blood Spot or CTXBS / Cerebrotendinous Xanthomatosis, Blood Spot, the individual tests will be canceled and HSMBS ordered.



Specimen Required


Supplies:

-Card-Blood Spot Collection (Filter Paper) (T493)

-Card-Postmortem Screening (Filter Paper) (T525)

Container/Tube:

Preferred: Blood Spot Collection Card (Filter Paper)

Acceptable: Whatman Protein Saver 903 filter paper, PerkinElmer 226 filter paper, Munktell filter paper, Postmortem Screening Card or collected with EDTA, sodium heparin, lithium heparin, or ACD B-containing devices

Specimen Volume: 2 Blood spots

Collection Instructions:

1. Let blood dry completely on the filter paper at ambient temperature in a horizontal position for a minimum of 3 hours.

2. At least 1 spot should be complete, (ie, unpunched).

3. Do not expose specimen to heat or direct sunlight.

4. Do not stack wet specimens.

5. Keep specimen dry.

Additional Information:

1. For collection instructions, see Blood Spot Collection Instructions.

2. For collection instructions in Spanish, see Blood Spot Collection Card-Spanish Instructions (T777).

3. For collection instructions in Chinese, see Blood Spot Collection Card-Chinese Instructions (T800).


Children's Mercy Hospital Note:

CMH COLLECTION: Completely fill at least 2 circles on the filter paper card

Specimen Minimum Volume

1 Blood spot

Specimen Stability Information

Specimen Type Temperature Time Special Container
Whole blood Refrigerated (preferred) 10 days FILTER PAPER
  Frozen  59 days FILTER PAPER
  Ambient  10 days FILTER PAPER

Testing Algorithm

If the patient has abnormal newborn screening results for acid sphingomyelinase deficiency, also called Niemann- Pick type A or B disease, refer to the appropriate American College of Medical Genetics and Genomics Newborn Screening ACT Sheet.(1)

 

For more information see Newborn Screen Follow-up for Acid Sphingomyelinase Deficiency

Useful For

Investigating a possible diagnosis of acid sphingomyelinase deficiency, also known as Niemann-Pick disease type A or B, using dried blood spots

 

This test is not recommended for diagnosis of Niemann-Pick type C (NPC) disease. If NPC is suspected, consider plasma oxysterols.

 

This test is not useful for the identification of carriers.

Reject Due To

Shows serum rings Reject
Insufficient specimen Reject
Layering Reject
Multiple applications Reject

Day(s) Performed

Tuesday, Thursday

Report Available

3 to 7 days

Reporting Name

Oxysterols, BS

Reference Values

Cholestane-3-beta,5-alpha,6-beta-triol

Cutoff: ≤0.800 nmol/mL

 

Lyso-sphingomyelin

Cutoff: ≤0.100 nmol/mL

Method Name

Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

82542