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What the serum calcium test actually measures, why it doesn't track dietary intake, and which companion tests reveal the real picture.
What serum sodium measures, how kidneys regulate it, and what shifts your result.
What potassium measures, how to read low and high results, and the intracellular storage gap that makes blood levels misleading.
What serum chloride measures, how to read high and low values, and which companion tests complete the acid-base picture.
What serum CO2 actually measures, how to read low and high values, and which companion tests complete the acid-base picture.
Blood sodium testing measures the amount of sodium, a charged mineral (electrolyte), in the liquid part of your blood. Sodium comes from your diet—mainly table salt (sodium chloride)—and after absorption in the gut it lives mostly in the fluid outside cells (extracellular fluid). Available at 2,000+ lab locations and at-home (select states). See FAQs below
Potassium blood testing measures the amount of potassium circulating in your blood (serum potassium, K+). Potassium is an essential mineral and electrolyte (a positively charged ion, or cation) that lives mainly inside your body’s cells. It enters the body from food, is absorbed in the gut, moves into and out of cells under hormonal signals (insulin, catecholamines), and is finely regulated by the kidneys under the influence of aldosterone. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Corrected calcium (albumin‑adjusted calcium) is a calculated estimate that modifies your routine blood calcium to account for albumin, the main protein that carries calcium in the bloodstream. In blood, calcium exists in two forms: attached to proteins, chiefly albumin (protein‑bound), and unbound (ionized). Available at 2,000+ lab locations and at-home (select states). See FAQs below
Chloride in blood is the chloride ion, a negatively charged electrolyte (anion) dissolved in the fluid outside your cells (extracellular fluid). It comes mainly from dietary salt (sodium chloride), is absorbed in the gut, and circulates in the bloodstream. The kidneys regulate chloride continuously, deciding how much to keep or excrete in response to hormones and the body’s acid–base needs. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Carbon dioxide (CO2) blood testing reports the total CO2 in your blood, which mostly reflects bicarbonate, the body’s main base. In standard chemistry panels this “CO2” is predominantly bicarbonate (HCO3−), with small amounts of dissolved CO2 and carbonic acid (H2CO3). CO2 is made continuously as your cells burn carbohydrates and fats for energy. Available at 2,000+ lab locations and at-home (select states). See FAQs below
Calcium blood testing measures the amount of calcium circulating in your bloodstream. Most of your body’s calcium is locked into bone and teeth as a hard mineral (hydroxyapatite). A small fraction travels in blood in two forms: free, biologically active calcium (ionized Ca2+) and calcium attached to proteins or small molecules (protein-bound and complexed). Available at 2,000+ lab locations and at-home (select states). See FAQs below
Hyponatremia reflects disordered water-sodium balance affecting brain, kidney, and endocrine function. Accurate blood sodium measurement confirms severity and guides evaluation. At Superpower, we provide blood tests measuring sodium for hyponatremia, with both in-clinic and at-home options. Home blood testing is currently available in selected states. (See FAQs below for more info).
Detecting hypokalemia early matters: potassium levels drive nerve, muscle, and heart function. At Superpower, we offer blood tests measuring potassium to assess for hypokalemia, with in-clinic and at-home options. Home collection is currently available in selected states. (See FAQs below for more info).
Blood testing for hypocalcemia clarifies nerve, muscle, and bone function by measuring circulating calcium balance. Superpower offers calcium, corrected calcium, and albumin tests to assess low calcium states. We provide in-clinic and at-home testing; home collection is currently available in selected states. (See FAQs below for more info).
Blood testing for hypernatremia detects elevated sodium, signaling disrupted water balance, dehydration, or renal/endocrine strain. Measuring serum sodium (Na+) clarifies osmolality status. At Superpower, we provide blood tests for testing sodium for hypernatremia, in-clinic and at home; home testing is available in selected states. (See FAQs below for more info).
Detecting hyperkalemia matters because potassium drives nerve signaling, muscle function, and heart rhythm; excess levels can indicate kidney impairment or medication effects and risk dangerous arrhythmias. At Superpower, we provide blood tests for testing potassium for Hyperkalemia—in-clinic or at home. Home testing is available in selected states. (See FAQs below for more info).
Hypercalcemia can signal parathyroid, bone, kidney, or malignancy-related disturbances in calcium regulation. Blood testing confirms and clarifies the physiology. At Superpower, we measure calcium, corrected calcium, and albumin for hypercalcemia. We offer in-clinic and at-home testing; home testing is currently available in selected states. (See FAQs below for more info).
Blood testing confirms dehydration by showing fluid balance and kidney stress. At Superpower, we measure sodium, the BUN/creatinine ratio, and albumin to quantify volume status. We offer in-clinic and at-home testing; home collection is currently available in selected states. (See FAQs below for more info).