Final answer:
Reference ranges for blood tests are vital in evaluating health; they include markers such as renal function, cholesterol levels, and white blood cell counts, and vary by age and gender.
Step-by-step explanation:
Understanding the reference ranges for blood tests is crucial for assessing various aspects of health. For instance, normal creatinine clearance values, which assess renal function, are 90-139 ml/min for adult males below 40 years, and 80-125ml/min for adult females.
On the other hand, normal cholesterol levels are considered to be about 150 mg/dL or less, and it's preferable to have even lower values for optimal health. For cardiovascular health, maintaining HDL cholesterol at least 40 mg/dL in men and 50 mg/dL in women is recommended. Blood tests also help in determining the normal range for white blood cells, plasma iron content, and other critical markers that are indicative of various health conditions. It is important for clinicians to interpret these values taking into consideration age, gender and other individual factors.