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.