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Test Code I2SB Iduronate-2-Sulfatase, Blood Spot


Necessary Information


1. Patient's age is required.

2. Reason for testing is required.



Specimen Required


Submit only 1 of the following specimen types:

 

Preferred:

Specimen Type: Blood spot

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

Container/Tube:

Preferred: Blood spot collection card

Acceptable: Whatman Protein Saver 903 Paper, PerkinElmer 226 filter paper, Munktell filter paper, or blood collected in tubes containing ACD or EDTA and dried on filter paper.

Specimen Volume: 2 Blood spots

Collection Instructions:

1. An alternative blood collection option for a patient older than 1 year is a fingerstick. For detailed instructions, see How to Collect Dried Blood Spot Samples.

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

3. Let blood dry on the filter paper at room temperature in a horizontal position for 3 hours.

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

5. Do not stack wet specimens.

6. Keep specimen dry.

Specimen Stability Information: Refrigerated (preferred) 60 days/Ambient 7 days/Frozen 60 days

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)

 

Acceptable:

Specimen Type: Whole Blood

Container/Tube:

Preferred: Lavender top (EDTA)

Acceptable: Yellow top (ACD)

Specimen Volume: 2 mL

Collection Instructions: Send whole blood specimen in original tube. Do not aliquot.

Specimen Stability Information: Refrigerate (preferred) 7 days/Ambient 48 hours


Forms

1. New York Clients-Informed consent is required. Document on the request form or electronic order that a copy is on file. The following documents are available:

-Informed Consent for Genetic Testing (T576)

-Informed Consent for Genetic Testing-Spanish (T826)

2. Biochemical Genetics Patient Information (T602)

3. If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.

Useful For

Supporting the biochemical diagnosis of mucopolysaccharidosis II (MPS II; Hunter syndrome)

 

This test is not useful for determining carrier status for MPS II.

Genetics Test Information

This test provides diagnostic testing for individuals with positive newborn screen results or clinical signs and symptoms suspicious for mucopolysaccharidosis type II (MPS II, Hunter syndrome). If an enzyme deficiency is detected by this screening test, additional biochemical or molecular testing is required to confirm a diagnosis.

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
MPSBS Mucopolysaccharidosis, BS Yes No

Testing Algorithm

If result interpretation is normal, testing is complete.

 

If result interpretation indicates mucopolysaccharidosis type II, quantitation of heparan sulfate, dermatan sulfate and keratan sulfate may be performed at an additional charge.

 

For more information see Newborn Screening Follow up for Mucopolysaccharidosis type II

Reporting Name

Iduronate-2-sulfatase, BS

Specimen Type

Whole blood

Specimen Minimum Volume

Blood Spots: 1
Whole Blood: 0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Whole blood Varies

Reject Due To

Blood spot specimen that shows serum rings or has multiple layers Reject
Insufficient specimen Reject
Unapproved filter papers Reject

Reference Values

>4.30 nmol/mL/hour

 

An interpretive report will be provided.

Day(s) Performed

Thursday

Report Available

8 to 15 days

Specimen Retention Time

1 year

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

82657

83864 (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
I2SB Iduronate-2-sulfatase, BS 79462-8

 

Result ID Test Result Name Result LOINC Value
BG749 Reason for Referral 42349-1
618290 Iduronate-2-sulfatase 79462-8
618417 Interpretation 59462-2
618416 Reviewed By 18771-6