welcome to HealthcareMagic
The first thing to remember is that the penis is never straight and it is always deviated or tilted to any side ;it is normal and it cannot be made straight.The medical test required for you will depend on exactly what you want to know like you can get done a CBC if you want to find the haemoglobin
content of your body;liver
profile and renal profile for assessing condition of liver and kidney
etc so you have to consult a doctor close by and tell him what you want to asess and then get tested.