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3. Leutinizing Hormone (LH). Leutinizing Hormone is secreted from the pituitary at night in pulses and stimulates the Leydig cells to produce testosterone. Thus, LH is responsible for (the great majority) of testosterone in men.
Plasma levels of LH are useful primarily for diagnostic purposes, because there are two "categories" of low testosterone: primary and secondary hypogonadism. In the case of primary hypogonadism, usually LH and FSH are overly high and this indicates that the problem is in the testes. Basically, the pituitary tries to compensate for the testes' lack of production by trying to pump out more LH in order to normalize testosterone production. LH just keeps climbing and climbing with no significant change in testosterone.
In the case of secondary hypogonadism, both LH and FSH are generally low or low normal and, in this case, the problem is somewhere rooted in the pituitary or the hypothalamus rather than in the testes themselves. Thus, with secondary hypogonadism the problem is not in the testes but in the brain's signaling to the testes.
Knowing whether you are primary or secondary can help a doctor know best how to treat you, or, at least, a knowledgeable one Some treatment methods, such as Clomid, are designed to work on men with secondary hypogonadism as a root issue.
4. Follicle Stimulating Hormone (FSH. FSH is also produced by the pituaitary and, coupled with testosterone, is responsible for sperm production. Doctors will pull this number primarily for fertility purposes.
5. Estradiol (E2). There are actually several estrogens in the blood stream of both men and women. Estradiol is the most well-known and "potent" estrogen and is responsible for most of its properties, both good and bad for us males.
Estradiol is one of the most important, and often ignored, hormones that should be pulled in men who are experiencing sexual or erectile dysfunction issues. The reason is that estradiol has a relatively tight range that men should, ideally, fall within. If estrogen goes too high (in men), it can cause many of the same issues associated with low testosterone: erectile dysfunction, low libido, fatigue, etc. Furthermore, it is a) fat-promoting, b) cancer promoting (in the prostate) and c) potentially fuels gynocomastia ("man-boobs").
What levels are too high for most men? The threshold where risk factors start climbing is probably in the 30's, i.e. around 35+ pg/ml. LEF documents some studies that show, for example, that above 37.4 pg/ml, overall mortality increases significantly. 
Can estrogen go too low in men? Absolutely and it happens all the time. Low testosterone men, in particular, are vulnerable to osteoporosis and other issues from low estradiol.. These problems are discussed in more detail in my link, Do Men Really Need Estrogen?
6. Vitamin D. One of the most important low testosterone tests is actually Vitamin D, due to the fact that Vitamin D deficiencies are so widespread. The standard for Vitamin D monitoring is called "25-hydroxy" test and can be obtained from a simple blood draw. Therefore, it can be pulled at the same time that you have your testosterone tested. Most labs and physicians now consider 30 ng/ml to be the threshold for a deficiency. However, many experts recommend that Vitamin D be maintained somewhat above that level.
What does your Vitamin D reading have to do with testosterone? It turns out Vitamin D is actually correlated with testosterone and appears to be partially causative. In other words, keeping your Vitamin D levels up to healthy levels may give you a boost in testosterone. (Some experts even consider Vitamin D much more a hormone than a vitamin.) For more information, see my link on The Benefits of Vitamin D.
7. Red Blood Cell Count. Testosterone actually governs male red blood cell counts in your blood and this is the reason that we have more red blood cells in our plasma than our wives and girlfriends. A good physicians will always monitor your RBC count, as it is called, to make sure that you are neither too high or too low.
Men with low testosterone often see their RBCs fall significantly and can even end up anemic. This is yet another reason that men can experience fatigue with hypogonadal testosterone levels. However, it is possible for a man with low T to have a relatively high RBC count and this can be an issue if he wants to go on HRT. Any further elevation of his red blood cell counts could result in a condition called polycythemia, which can be very dangerous. (Some of the Tour De France riders have almost died from this condition due to doping).  One of our forum posters actually found himself in this condition, for example, even though his most recent testosterone reads were 290 and 301 ng/dl. 
So what are acceptable RBC counts? Different labs have a little different ranges, but the range given as normal is generally around 4.3-5.7 million cells/mcl. Notice, however, that this forum poster's range was 4.1-5.6 and thus differently slightly.  I have seen higher levels as well, say, at 4.7-6.1.
Also, some men may wonder why testosterone increases red blood cell counts. The reason actually ties into a kidney hormone called erythropoietin which induces red blood cell production in the stem cells of the bones. Testosterone actually increases erythropoietin production and, therefore, actually causes an increase in red blood cells due to its downstream influences.
8. Prolactin. If this hormone goes too high, it drive down testosterone levels and negatively impact dopamine. The net effect is usually significantly lowered libido and sexual function. I cover this in more detail in my link on Prolactin and Prolactinomas.
9. Thyroid Stimulating Horomone (TSH). If this is high, then you may have hypothyroidism. TSH actually comes from the pituitary and not the the thyroid gland. In general, when the pituitary senses that your thyroid hormones are falling too low, it pumps out more TSH in order to compensate, similar to elevated Leutinizing Hormone (LH) in men with primary hypogonadism.
What does this have to do with testosterone. Well, researchers have found that hypothyroidism is associated lower testosterone levels and it is no wonder since it usually comes with fatigue, weight gain and a slowed metabolism and libido. None of these are good for testosterone.
10. T4 and T3. These two thyroid hormones, which are triggered by TSH coming from the pituitary, can be low as well. Somewhat like testosterone, these can come as total T4 and/or T3 and free T4 and/or T3. When these are below the reference ranges, you will usually find that your physician will consider you hypothyroid.
11. PSA. Physicians will generally monitor your prostate before administering Hormone Replacement Therapy because many experts believe that, if you have existing prostate cancer, testosterone therapy could accelerate its maturation and development. PSA results are actually now under question, but, even so, it still remains the "tool of choice" for most doctors.
12. Liver Function. This is an important test for low testosterone men,. because testosterone is metabolized in the liver. A good physician at a minimum will check to make sure that you do not have any existing liver disease or disorders. In addition, some of the injectables (cypionate, enanthiate, etc.) actually have to be broken down into testosterone. The topicals (Androgel, Testime, etc.) have a good liver side effect profile but should be checked regardless from time to time as occasional issues do occur.
1) Quest Diagnostics, Table 1, Testosterone Reference Ranges in Adults, http://www.questdiagnostics.com/hcp/ intguide/EndoMetab/Gen_Misc/Testosterone/Table%201.pdf
5) Labcorp, Technical Review, "Testosterone: Aiding in the diagnosis of androgen dysfunction and hypogonadism"
8) Dtsch Arztebl Int, Jan 2008, 105(4):62–68, "Congenital and Acquired Polycythemias"
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