Relationships between hematocrit, viscosity, and shear rate are important factors to put into consideration. Since blood is non-Newtonian, the viscosity of the blood is in relation to the hematocrit, and as a function of shear rate. This is important when it comes to determining shear force, since a lower hematocrit level indicates that there is a need for more force to push the red blood cells through the system. This is because shear rate is defined as the rate to which adjacent layers of fluid move in respect to each other.  Plasma is a more viscous material than typically red blood cells [ citation needed ] , since they are able to adjust their size to the radius of a tube; the shear rate is purely dependent on the amount of red blood cells being forced in a vessel.
Other significant adverse effects of testosterone supplementation include acceleration of pre-existing prostate cancer growth in individuals who have undergone androgen deprivation; increased hematocrit , which can require venipuncture in order to treat; and, exacerbation of sleep apnea .  Adverse effects may also include minor side-effects such as acne and oily skin, as well as, significant hair loss and/or thinning of the hair, which may be prevented with 5-alpha reductase inhibitors ordinarily used for the treatment of benign prostatic hyperplasia , such as finasteride .  Exogenous testosterone may also cause suppression of spermatogenesis , leading to, in some cases, infertility.  It is recommended that physicians screen for prostate cancer with a digital rectal exam and prostate-specific antigen (PSA) level before starting therapy, and monitor PSA and hematocrit levels closely during therapy. 
I completely agree with you, Kyle. Whenever exogenous Testosterone is stopped – whether it was being taken for TRT or cycled for bodybuilding – some kind of ‘PCT’ (Post-Cycle Therapy) should be utilized to help ‘re-awaken’ your HPG axis after it had been shut down by Testosterone replacement or cycling. It is important to note that such PCT is NOT taken forever! The use of HCG and either Tamoxifen or Clomid will help greatly in reducing withdrawal symptoms by bolstering your body’s natural Testosterone production and greatly speeding up recovery time (the time it takes for your body to start creating its own testosterone again without any external substance).