Good point, they should have a proper E2 test of some sort as it is baseline for female infertility and menopause confirmation.
Often when looking at academic studies, this si the sort of reference chart you get:
This is more what you are looking for. I have scene this floating around, I did find the original source but I do not have the time this morning to confirm the data aggregation used to make the chart.
(Dominique Simon, Marie-Aline Charles, Khalil Nahoul, Genevieve Orssaud, Jacqueline Kremski, Veronique Hully, Evelyne Joubert, Laure Papoz, Eveline Eschwege; Association between Plasma Total Testosterone and Cardiovascular Risk Factors in Healthy Adult Men: The Telecom Study, The Journal of Clinical Endocrinology & Metabolism, Volume 82, Issue 2, 1 February 1997, Pages 682–685, https://doi.org/10.1210/jcem.82.2.3766
Low hormones can be a cause of depression and anxiety based disorders. For this I will refer to the below study:
"Our results show that in a large population of hypogonadal
men, 92.4% of patients demonstrated depression symptoms
as measured by the PHQ-9, ranging from minimal to severe.
The percentage of patients with moderately severe to severe
depression symptoms was 17.3% in the overall population,
and when analyzed by subcohort, the percentage of patients
with moderately severe to severe depression symptoms was
significantly greater in subcohorts defined by medication usage,
age (<60 years), and TT levels. After 12 months of TRT,
the percentage of patients with moderately severe to severe
depression symptoms significantly decreased from 17.3%
to 2.1% and PHQ-9 scores significantly improved. Overall,
the mean drop in PHQ-9 score after 12 months of TRT was
5.62±6.24, which represents a clinically meaningful improvement
 in depression symptoms. "
Khera, M., Bhattacharya, R. K., Blick, G., Kushner, H., Nguyen, D., & Miner, M. M. (2012). The effect of testosterone supplementation on depression symptoms in hypogonadal men from the Testim Registry in the US (TRiUS). Aging Male, 15(1), 14-21. doi:10.3109/13685538.2011.606513
All references to studies are accessed and verified by EBSCO. Selection was made for peer reviewed journals