If it produces too much thyroid hormone, the bodyâs metabolism goes too fast, a condition which is called hyperthyroidism. If it produces too little, the reverse happens, and this condition is called hypothyroidism. Interestingly, both hyperthyroidism and hypothyroidism can cause fatigue.f it produces too much thyroid hormone, the bodyâs metabolism goes too fast, a condition which is called hyperthyroidism. If it produces too little, the reverse happens, and this condition is called hypothyroidism. Interestingly, both hyperthyroidism and hypothyroidism can cause fatigue.
Blood urea nitrogen (BUN) measures the amount of urea nitrogen in bloodstream. Urea is formed in liver as the end product of protein metabolism and digestion. Urea is transported to the kidneys for excretion. A normal range for blood urea nitrogen is generally 8 to 24 mg/dl for adult males and 6 to 21 mg/dl for females.Generally, a high blood urea nitrogen level means that the kidneys are not performing well, particularly if the result is above 50mg/dl.ormal range of serum creatinine level will differ with age, gender and physical constitute. In adult men, normal range of serum creatinine is 0.9-1.3mg/dl; while in adult women, normal range of creatinine is 0.6 to 1.1mg/dl.
The normal range of urea nitrogen in blood or serum is 5 to 20 mg/dl, or 1.8 to 7.1 mmol urea per liter. The range is wide because of normal variations due to protein intake, endogenous protein catabolism, state of hydration, hepatic urea synthesis, and renal urea excretion.he principle behind this ratio is the fact that both urea (BUN) and creatinine are freely filtered by the glomerulus, however urea reabsorbed by the tubules can be regulated (increased or decreased) whereas creatinine reabsorption remains the same (minimal reabsorption).