What is the reference range?

A reference range is a set of values that includes upper and lower limits of a lab test based on a group of otherwise healthy people. The values in between those limits may depend on such factors as age, sex, and specimen type (blood, urine, spinal fluid, etc.)

What is a reference range and how is it determined?

The standard definition of a reference range for a particular measurement is defined as the interval between which 95% of values of a reference population fall into, in such a way that 2.5% of the time a value will be less than the lower limit of this interval, and 2.5% of the time it will be larger than the upper …

How do you calculate reference range?

The common formula to calculate the reference range is: mean±1.96x SD.

What is a reference value in math?

A reference value is the known and correct measurement for each part. The reference value is used for comparison during measurement system analysis. Reference values are an average of repeated measurements from more accurate measuring equipment. Reference values are endorsed by a professional group.

What is a reference range for drugs?

The current reference range is 10–30 μmol/L (2–5 mg/L). This range was derived from pharmacokinetic calculations based on doses used in clinical studies.

What does negative reference range mean?

If your results fall outside the reference range, or if you have symptoms despite a normal result, you will likely need more testing. Your lab results may also include one of these terms: Negative or normal, which means the disease or substance being tested was not found.

How do you create a range?

The range is calculated by subtracting the lowest value from the highest value.

What is reference value?

Listen to pronunciation. (REH-frents VAL-yooz) In medicine, a set of values that a doctor uses to interpret a patient’s test results. The reference values for a given test are based on the results that are seen in 95% of the healthy population.

What is a normal range in statistics?

To avoid this we use a range between two quantiles (Section 4.7), usually the 2.5 centile and the 97.5 centile, which is called the normal range, 95% reference range, or 95% reference interval. This has led some people to develop approaches which say that all data which do not fit under a Normal curve are abnormal!

What is 36 as a percentage of 60?

Percentage Calculator: 36 is what percent of 60? = 60.

How do you find reference values?

Calculate the reference number. The reference number equals pi – the terminal point. For example, if your terminal point = 5 pi / 6, your reference number = pi / 6. Pi would equal 6 pi / 6, and 6 – 5 = 1 or 1 pi / 6.

How to determine reference range?

When assuming a normal distribution, the reference range is obtained by measuring the values in a reference group and taking two standard deviations either side of the mean. This encompasses ~95% of the total population.

What does a reference range mean?

Reference range. In: In health-related fields, a reference range or reference interval is the range of values that is deemed normal for a physiologic measurement in healthy persons (for example, the amount of creatinine in the blood, or the partial pressure of oxygen).

What is reference range laboratory tests?

A reference range is usually defined as the set of values 95 percent of the normal population falls within (that is, 95% prediction interval). It is determined by collecting data from vast numbers of laboratory tests.

What is a reference interval?

The reference interval is defined as the interval between and including two numbers, an upper and lower reference limit, which are estimated for a specified percentage (usually 95%) of the values for a population from which the reference subjects have been drawn2.