Quest Diagnostics Ultrasensitive Estradiol Code

The aforementioned thread by Nelson is a great post, emphasizing you MUST run the more sensitive estradiol assay. The standard assay is not valid for adult males, and usually over-estimates the true E concentration. This may lead to inappropriate use of an aromatase inhibitor, to the detriment of the patient.

The Quest Ultrasensitive E2 is the preferred LC/MS laboratory methodology. The LabCorp Sensitive Estradiol is an immunoassay, which is inferior, but my clinical experience shows it is usually okay. LabCorp now has a new line of LC/MS assays for the hormonal assays we need; the specific LabCorp codes for you are here:

Testosterone, Bioavailable w/ SHBG #500650
DHEA-S #500161
Estradiol #500108
Estrone #500634

CBC #005009
Comprehensive Metabolic Panel #322000
FSH and LH #028480
DHT #500142
Prolactin #004465
PSA #010322
Progesterone #500167
Pregnenolone #140707
Ferritin #004598
TSH # 004259
Free T4 #501902
Free T3 #503600
reverseT3 #070104
IGF-1 #010363
IGFBP-3 #140152
Vitamin D, 25-Hydroxy #081950


I prefer the Free T4 and Free T3 assays, as they remove the influences of Thyroid Binding Globulin.
 
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