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HelpTest Code HSMWB Hepatosplenomegaly Panel, Blood
Ordering Guidance
This test should not be used for monitoring patients with confirmed diagnoses. If the testing requested is for monitoring purposes, see:
-CTXWB / Cerebrotendinous Xanthomatosis, Blood
-GPSYW / Glucopsychosine, Blood
-OXYWB / Oxysterols, Blood
This test's clinical sensitivity and specificity for the identification of Niemann-Pick type C (NPC) is 75% and 89%, respectively. If NPC is strongly suspected, the recommended test is HSMP / Hepatosplenomegaly Panel, Plasma.
Specimen Required
Collection Container/Tube:
Preferred: Lavender top (EDTA)
Acceptable: Green top (sodium heparin, lithium heparin), yellow top (ACD B)
Specimen Volume: 1 mL
Collection Instructions: Send whole blood specimen in original vial. Do not aliquot.
Forms
If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.
Useful For
As a component of the initial evaluation of a patient presenting with hepatosplenomegaly
This test is not useful for the identification of carriers.
This test should not be used as a monitoring for patients with confirmed diagnoses.
Method Name
Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)
Reporting Name
Hepatosplenomegaly Panel, BSpecimen Type
Whole bloodSpecimen Minimum Volume
0.25 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Whole blood | Refrigerated (preferred) | 72 hours | |
| Ambient | 48 hours |
Reject Due To
| Gross hemolysis | OK |
| Gross lipemia | OK |
| Gross icterus | OK |
Clinical Information
Hepatosplenomegaly is a presenting or accompanying feature for many different inborn errors of metabolism. It typically is a consequence of chronic hepatic dysfunction or abnormal storage of lipids, sugars, or other improperly metabolized analytes due to a particular enzymatic deficiency. The diagnosis can occasionally be narrowed down by consideration of clinical symptoms; however, clinical diagnosis can be difficult due to similarity of clinical features across disorders as well as phenotypic variability. Therefore, screening tests can play an important role in the workup of a patient presenting with hepatosplenomegaly who may have a lysosomal or lipid storage disorder.
The conditions detected in this assay are cerebrotendinous xanthomatosis, Gaucher disease, and Niemann-Pick (NP) disease types A, B (also known as acid sphingomyelinase deficiency), and, with a lower sensitivity and specificity, NPC.
Patients with abnormal results should have follow-up enzymatic or molecular testing for confirmation of diagnosis.
Table. Conditions Identifiable by Method
|
Disorder |
Onset |
Analyte detected |
Gene |
Incidence |
|
Cerebrotendinous xanthomatosis (CTX) |
Infancy - adulthood |
7-Alpha-hydroxy-4-cholesten-3-one (7aC4) 7-Alpha,12-aplha-dihydroxycholest-4-en-3-one (12aC4) |
CYP27A1 |
1 in 50,000 As high as 1 in 400 in Druze population. |
|
Phenotype: Early onset diarrhea, cataracts, tendon/cerebral xanthomas, osteoporosis, neuropsychological manifestations, liver disease/hepatosplenomegaly. |
||||
|
Gaucher disease |
Type I: childhood/adult Types II/III: neonatal-early childhood |
Glucopsychosine (GPSY) |
GBA |
Type I: 1 in 30,000 to 1 in 100,000 Types II/III: 1 in 100,000 |
|
Phenotype: All types exhibit hepatosplenomegaly and hematological abnormalities. Type I: Organomegaly, thrombocytopenia, and bone pain. Absence of neurologic symptoms. Types II/III: Primary neurologic disease, developmental delay/regression, hepatosplenomegaly, lung disease. Patients with type II typically die by 2 to 4 years of age. Patients with type III may have a less progressive phenotype and may survive into adulthood. |
||||
|
Niemann-Pick type A/B (NPA, NPB) |
NPA: neonatal NPB: birth-adulthood |
Lyso-sphingomyelin (LSM) LSM 509 |
SMPD1 |
Combined incidence 1 in 250,000 |
|
Phenotype: NPA: Feeding difficulties, jaundice, hepatosplenomegaly, neurologic deterioration, lung disease, hearing and vision impairment, cherry red macula, death usually by 3 years of age. NPB: Mainly limited to visceral symptoms; hepatosplenomegaly, stable liver dysfunction, pulmonary compromise, osteopenia. |
||||
|
Niemann-Pick type C (NPC) |
Variable (perinatal-adulthood) |
Cholestane-3 beta, 5 alpha, 6 beta-triol (COT) LSM 509 |
NPC1 or NPC2 |
1 in 120,000 to 1 in 150,000 |
|
Phenotype: Variable clinical presentation; ataxia, vertical supranuclear gaze palsy, dystonia, progressive speech deterioration, seizures, ± hepatosplenomegaly. |
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Patients with Fabry disease may also be identified by this assay. The glycosphingolipid, globotriaosylsphingosine (LGb3), may be elevated in symptomatic patients and supports a diagnosis of Fabry disease. Normal values of LGb3 do not rule out Fabry disease. Patients with Fabry disease do not have hepatosplenomegaly as an accompanying feature.
Reference Values
CHOLESTANE-3-BETA,5-ALPHA,6-BETA-TRIOL
Cutoff: ≤0.800 nmol/mL
LYSO-SPHINGOMYELIN
Cutoff: ≤0.100 nmol/mL
GLUCOPSYCHOSINE
Cutoff: ≤0.040 nmol/mL
7-ALPHA-HYDROXY-4-CHOLESTEN-3-ONE (7aC4)
Cutoff: ≤0.750 nmol/mL
7-ALPHA,12-ALPAH-DIHYDROXYCHOLEST-4-en-3-ONE (12aC4)
Cutoff: ≤0.250 nmol/mL
GLOBOTRIAOSYLSPHINGOSINE
Cutoff: ≤0.034 nmol/mL
Interpretation
An elevation of 7-alpha-hydroxy-4-cholesten-3-one (7aC4) and 7-alpha,12-alpha-dihydroxycholest-4-en-3-one (12aC4) is strongly suggestive of cerebrotendinous xanthomatosis.
An elevation of lyso-sphingomyelin (LSM) and LSM 509 is highly suggestive of Niemann-Pick type A or B disease.
An elevation of cholestane-3 beta, 5 alpha, 6 beta-triol and LSM 509 is highly suggestive of Niemann-Pick disease type C.
An elevation of glucopsychosine is indicative of Gaucher disease.
Cautions
Patients with Wolman disease or cholestatic biliary atresia may have a profile similar to Niemann-Pick disease type C.
Patients with bile acid malabsorption or ileal resection may have elevations of 7-alpha-hydroxy-4-cholesten-3-one (7aC4).
This test does not identify all causes of hepatosplenomegaly.
A positive test result is strongly suggestive of a diagnosis but needs follow-up by stand-alone biochemical or molecular assay.
Method Description
Whole blood is spotted on filter paper and dried overnight. A 3-mm dried blood spot is extracted with internal standard. The extract is subjected to liquid chromatography tandem mass spectrometry (LC-MS/MS) analysis. The MS/MS is operated in the multiple reaction monitoring positive mode to follow the precursor to product species transitions for each analyte and internal standard. The ratio of the extracted peak areas to internal standard determined by the LC-MS/MS is used to calculate the concentration of in the sample.(Unpublished Mayo method)
Day(s) Performed
Tuesday
Report Available
3 to 9 daysSpecimen Retention Time
Whole blood: 7 days; Dried blood spot: Normal results: 2 months; Abnormal result: IndefinitelyPerforming 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
82542
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| HSMWB | Hepatosplenomegaly Panel, B | 92744-2 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 601534 | Interpretation (HSMWB) | 59462-2 |
| 601528 | Cholestane-3beta,5alpha,6beta-triol | 92756-6 |
| 601529 | Lyso-sphingomyelin | 92748-3 |
| 601530 | Glucopsychosine | 92751-7 |
| 601531 | 7a-hydroxy-4-cholesten-3-one | 92762-4 |
| 601532 | 7a,12a-dihydroxycholest-4-en-3-one | 92759-0 |
| 601533 | Globotriaosylsphingosine | 92753-3 |
| 601535 | Reviewed By | 18771-6 |