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To view specimen requirements and codes please select your laboratory:

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TSH W/REFLEX TO FT4

Test Code

36127

CPT Code(s)

84443

Preferred Specimen(s)

PATIENT PREPARATION:
SPECIMEN COLLECTION AFTER FLUORESCEIN DYE ANGIOGRAPHY SHOULD
BE DELAYED FOR AT LEAST 3 DAYS. FOR PATIENTS ON
HEMODIALYSIS, SPECIMEN COLLECTION SHOULD BE DELAYED FOR 2
WEEKS. ACCORDING TO THE ASSAY MANUFACTURER SIEMENS:
"SAMPLES CONTAINING FLUORESCEIN CAN PRODUCE FALSELY
DEPRESSED VALUES WHEN TESTED WITH THE ADVIA CENTAUR TSH3
ULTRA ASSAY."

1 ML SERUM

INSTRUCTIONS:
THIS ASSAY SHOULD ONLY BE ORDERED ON PATIENTS 1 YEAR OF AGE
OR OLDER. ORDERS ON PATIENTS YOUNGER THAN 1 YEAR WILL HAVE
A TSH ONLY PERFORMED.

Minimum Volume

0.7 ML

Alternative Specimen(s)

SODIUM HEPARIN (GREEN-TOP) TUBE

Transport Container

SERUM SEPARATOR TUBE (SST)

Transport Temperature

ROOM TEMPERATURE

Specimen Stability

SERUM:
ROOM TEMPERATURE: 7 DAYS
REFRIGERATED: 7 DAYS
FROZEN: 28 DAYS

PLASMA:
ROOM TEMPERATURE: 72 HOURS
REFRIGERATED: 7 DAYS
FROZEN: 28 DAYS

Methodology

IMMUNOASSAY

Performing Laboratory

DIAGNOSTIC LABORATORY OF OKLAHOMA
225 NE 97TH STREET
OKLAHOMA CITY OK 73114-6302

Setup Time

2ND SHIFT

Setup Days

SUNDAY-FRIDAY

Report Available

3 DAYS

Clinical Significance

FOR DIFFERENTIAL DIAGNOSIS OF PRIMARY, SECONDARY, AND
TERTIARY HYPOTHYROIDISM. ALSO USEFUL IN SCREENING FOR
HYPERTHYROIDISM. THIS ASSAY ALLOWS ADJUSTMENT OF EXOGENOUS
THYROXINE DOSAGE IN HYPOTHYROID PATIENTS AND IN PATIENTS ON
SUPPRESSIVE THYROXINE THERAPY FOR THYROID NEOPLASIA.

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.