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TSH
MessageChemistry
Test Code
LAB129
Alias/See Also
Thyroid Stimulating Hormone
CPT Codes
84443
Preferred Specimen
Gold top (serum separator tube)
Minimum Volume
Whole blood: 800 uL (TWO full red-top microtainers or two full light green-top microtainer).
Serum/plasma: 400 uL
Serum/plasma: 400 uL
Other Acceptable Specimens
Red Top and light green top (lithium heparin plasma) acceptable
Specimen Stability
Ambient: up to 2 hours.
Refrigerated: 7 days.
Frozen: 4 weeks.
Refrigerated: 7 days.
Frozen: 4 weeks.
Report Available
Same day
Limitations
Biotin levels in serum remain elevated for up to 24 hours after oral or intravenous biotin administration.
Heterophilic antibodies in serum or plasma samples may cause interference in immunoassays.These
antibodies may be present in blood samples from individuals regularly exposed to animals or who have been
treated with animal serum products. Results which are inconsistent with clinical observations indicate the
need for additional testing.
Thyroid hormone autoantibodies in samples may cause interference with this test. Results which are
inconsistent with clinical observations indicate the need for additional testing.
The performance of this test has not been established using neonatal specimens.
Heterophilic antibodies in serum or plasma samples may cause interference in immunoassays.These
antibodies may be present in blood samples from individuals regularly exposed to animals or who have been
treated with animal serum products. Results which are inconsistent with clinical observations indicate the
need for additional testing.
Thyroid hormone autoantibodies in samples may cause interference with this test. Results which are
inconsistent with clinical observations indicate the need for additional testing.
The performance of this test has not been established using neonatal specimens.
Reference Range
0.47 - 4.68 micro IU/ml
Performing Laboratory
Hoag Newport/ Hoag Irvine
