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Test Code TYRBS Tyrosinemia Follow Up Panel, Blood Spot


Necessary Information


Patient's age and reason for testing are 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 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 filter paper at room temperature in a horizontal position for a minimum of 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: Ambient (preferred) 7 days/Refrigerated 14 days/Frozen 90 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: Lavender top (EDTA)

Specimen Volume: 2 mL

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

Specimen Stability Information: Refrigerate 6 days


Useful For

Monitoring of individuals with tyrosinemia type 1 (HT-1)

 

Diagnosis of HT-1 when used in conjunction with testing for urine organic acids, liver function, alpha-fetoprotein, and molecular genetic analysis of the fumarylacetoacetate hydrolase (FAH) gene

Method Name

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

Reporting Name

Tyrosinemia Follow Up Panel, 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

Reference Values

TYROSINE:

<4 weeks 40-280 nmol/mL

≥4 weeks 25-150 nmol/mL

 

PHENYLALANINE:

27-107 nmol/mL

 

METHIONINE

11-45 nmol/mL

 

SUCCINYLACETONE:

≤1.0 nmol/mL

 

NITISINONE:

≤0.5 nmol/mL

Day(s) Performed

Monday through Friday

Report Available

3 to 5 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

84510

84030

82542

80299

82542 only (if appropriate for government payers)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TYRBS Tyrosinemia Follow Up Panel, BS 94573-3

 

Result ID Test Result Name Result LOINC Value
607553 Tyrosine 35571-9
607554 Phenylalanine 29573-3
607555 Methionine 47700-0
607556 Succinylacetone 53231-7
607557 Nitisinone 85098-2
BG722 Reason for Referral 42349-1
607552 Reviewed By 18771-6