Evidence-Based Supplement & Herb Guides

Aldosterone Blood Test Normal Range: Reference Values and Meaning

Learn the aldosterone blood test normal range, why upright and supine values differ, and what high or low aldosterone may mean with renin, potassium, sodium, blood pressure, and kidney function.

Aldosterone is a hormone that helps control blood pressure, blood volume, sodium, and potassium. It is made by the adrenal glands, which sit above...

Anion Gap Blood Test Normal Range: Reference Values and Meaning

Learn the normal anion gap blood test range, how it is calculated, what high and low results mean, and when abnormal values may need urgent follow-up.

The anion gap is a calculated value that helps show whether the blood has an unusual buildup of acids. It is usually reported with...

Beta-2 Microglobulin Blood Test: High Levels, Kidney Function, Blood Cancer Marker, and Results

Learn what a beta-2 microglobulin blood test means, including high B2M causes, kidney function links, urine B2M, blood cancer monitoring, normal ranges, and follow-up steps.

Beta-2 microglobulin is a small protein found on the surface of most cells in the body. A blood test for beta-2 microglobulin, often shortened...

Bicarbonate and Anion Gap: Interpreting Acid-Base Blood Tests

Learn how bicarbonate and anion gap blood tests help interpret metabolic acidosis, high anion gap patterns, kidney disease, ketoacidosis, and urgent acid-base results.

Bicarbonate and anion gap results help show whether the body is keeping acid and base in balance. These numbers usually appear on a metabolic...

Bicarbonate Blood Test Normal Range: Reference Values and Meaning

Learn the normal bicarbonate blood test range, what low or high CO2/HCO3 results mean, and how kidneys, lungs, electrolytes, and the anion gap affect interpretation.

A bicarbonate blood test helps show how well your body is keeping acids and bases in balance. On most routine lab reports, bicarbonate appears...

Blood Urea Nitrogen (BUN) Test Normal Range: Reference Values and Meaning

Learn the normal BUN test range, what high and low blood urea nitrogen results can mean, and how BUN compares with creatinine, eGFR, hydration, diet, and kidney function.

Blood urea nitrogen, often shortened to BUN, is a blood test that helps show how much urea nitrogen is circulating in your bloodstream. Urea...

BUN and Creatinine: Interpreting the Kidney Panel Without Overdoing It

Learn how to interpret BUN, creatinine, eGFR, and the BUN/creatinine ratio without overreacting, including dehydration patterns, kidney disease clues, repeat testing, and when follow-up matters.

BUN and creatinine are two common blood markers that help show how your kidneys are handling waste. They often appear together on a basic...

BUN/Creatinine Ratio: Dehydration vs Kidney Disease Pattern

Understand the BUN/creatinine ratio, including high ratio dehydration patterns, kidney disease patterns, normal ranges, causes, follow-up testing, and when abnormal results need urgent care.

The BUN/creatinine ratio compares two waste markers that often appear together on a kidney or metabolic blood panel. BUN, or blood urea nitrogen, rises...

BUN/Creatinine Ratio Normal Range: Reference Values and Meaning

Learn the normal BUN/creatinine ratio range, what high and low ratios mean, common causes, and how to read results with BUN, creatinine, and eGFR.

The BUN/creatinine ratio is a calculated blood test result that compares blood urea nitrogen, a waste product from protein breakdown, with creatinine, a waste...

Calcium, Phosphorus, and PTH: Interpreting Kidney-Mineral Balance

Learn how calcium, phosphorus, and PTH work together in kidney-mineral balance, including common lab patterns, CKD-related changes, follow-up tests, and when abnormal results need prompt care.

Calcium, phosphorus, and parathyroid hormone (PTH) are best interpreted together because they work as a linked system. Calcium supports nerves, muscles, heart rhythm, blood...

Carbon Dioxide (CO2) Blood Test Normal Range: Reference Values and Meaning

Learn the normal CO2 blood test range, what high or low carbon dioxide means, how bicarbonate relates to kidney and lung function, and when follow-up matters.

A carbon dioxide blood test checks how much total CO2 is in the liquid part of your blood. In everyday lab reports, this result...

Chloride Blood Test Normal Range: Reference Values and Meaning

Learn the normal chloride blood test range, what high and low chloride mean, and how chloride is interpreted with sodium, potassium, bicarbonate, kidney markers, and the anion gap.

A chloride blood test measures the amount of chloride in the blood, usually as part of an electrolyte panel, basic metabolic panel, or comprehensive...

Creatinine and eGFR: Interpreting Kidney Function Without Panicking

Understand creatinine and eGFR results, common causes of abnormal kidney function labs, when to repeat testing, and when low eGFR or high creatinine needs medical follow-up.

Creatinine and eGFR are two of the most common numbers used to check kidney filtration, but they are easy to overread. Creatinine is a...

Creatinine Blood Test Normal Range: Reference Values and Meaning

Learn the normal creatinine blood test range, what high and low creatinine can mean, how eGFR changes interpretation, and when kidney follow-up is needed.

A creatinine blood test helps estimate how well your kidneys are filtering waste from your blood. Creatinine is made during normal muscle activity and...

Creatinine Clearance Test: Kidney Filtration Rate, Normal Range, Low Clearance, and Results

Learn what a creatinine clearance test measures, normal ranges, how 24-hour urine collection works, and what low or abnormal kidney filtration results may mean.

A creatinine clearance test estimates how much blood your kidneys can clear of creatinine each minute. Creatinine is a waste product made from normal...

Creatinine vs eGFR: Which Kidney Marker Matters More?

Creatinine vs eGFR explained clearly: learn which kidney marker matters more, when creatinine is misleading, how eGFR stages kidney function, and what follow-up tests help.

Creatinine and eGFR are connected, but they do not tell the same story. Creatinine is a measured blood level of a waste product that...

Cystatin C and Creatinine: Interpreting eGFR When Results Disagree

Learn why cystatin C and creatinine eGFR results can disagree, what each pattern may mean, and when combined eGFR, urine albumin, repeat testing, or medical follow-up can clarify kidney function.

Cystatin C and creatinine are both blood markers used to estimate glomerular filtration rate, or eGFR, which is the usual lab-reported estimate of kidney...

Cystatin C Blood Test: High Cystatin C, eGFR, Normal Range, and Kidney Function

Learn what the cystatin C blood test measures, what high cystatin C means, how cystatin C eGFR compares with creatinine, and when kidney follow-up matters.

Cystatin C is a small protein that helps estimate how well your kidneys filter blood. It is often used when a creatinine-based kidney test...

Electrolyte Panel Test: Sodium, Potassium, Chloride, CO2, Normal Ranges, and Results

Learn what an electrolyte panel measures, including sodium, potassium, chloride, and CO2, with normal ranges, causes of high and low results, and when follow-up or urgent care may be needed.

An electrolyte panel is a blood test that checks minerals that help control fluid balance, nerve signals, muscle function, heart rhythm, and acid-base balance....

Estimated Glomerular Filtration Rate (eGFR) Test: Kidney Function, CKD Stages, Low eGFR, and Results

Learn what the eGFR test measures, how to understand kidney function results, CKD stages, low eGFR causes, follow-up tests, and when abnormal results need medical care.

The estimated glomerular filtration rate, or eGFR, is a calculated kidney function result that estimates how much blood your kidneys filter each minute. Most...