Comprehensive Panel (excluding hormones)

Apolipoprotein B (ApoB) is the primary protein on the surface of all potentially atherogenic lipoprotein particles (LDL, VLDL, IDL, Lp(a)). Measuring ApoB provides a direct count of these particles, which is considered by many longevity experts to be a superior predictor of cardiovascular disease (ASCVD) risk compared to LDL-C alone, as it reflects the particle concentration driving atherosclerosis. Lowering ApoB to optimal levels is a key strategy in ASCVD prevention. Ranges assume no underlying medical conditions such as prior heart disease.

Hematocrit (Hct), also known as Packed Cell Volume (PCV), measures the percentage of blood volume occupied by red blood cells. It generally correlates with hemoglobin and RBC count and is used to assess anemia or polycythemia/erythrocytosis. Dehydration can falsely elevate hematocrit.

Red Blood Cell (RBC) Count measures the number of red blood cells per volume of blood. RBCs contain hemoglobin and are responsible for transporting oxygen from the lungs to the tissues. Low RBC count (anemia) reduces oxygen-carrying capacity, while high count (polycythemia or erythrocytosis) increases blood viscosity.

Hemoglobin (Hgb) is the protein within red blood cells that binds to and carries oxygen. Measuring hemoglobin concentration is a primary test for anemia (low Hgb) or polycythemia/erythrocytosis (high Hgb). Anemia leads to fatigue and reduced exercise capacity due to impaired oxygen delivery.

Mean Corpuscular Volume (MCV) measures the average size (volume) of red blood cells. It is crucial for classifying anemia: low MCV (<80 fL) indicates microcytic anemia (e.g., iron deficiency, thalassemia), normal MCV (80-100 fL) indicates normocytic anemia (e.g., chronic disease, acute blood loss), and high MCV (>100 fL) indicates macrocytic anemia (e.g., B12/folate deficiency, liver disease, alcohol excess).

Mean Corpuscular Hemoglobin (MCH) measures the average amount (weight) of hemoglobin within a single red blood cell. It tends to correlate with MCV; smaller cells (low MCV) generally have less hemoglobin (low MCH), and larger cells (high MCV) have more. Low MCH (<27 pg) (hypochromia) is typical in iron deficiency anemia and thalassemia.

Mean Corpuscular Hemoglobin Concentration (MCHC) measures the average concentration of hemoglobin within red blood cells (relative to cell volume). Low MCHC (<32 g/dL) indicates hypochromia (paler cells), seen in iron deficiency and thalassemia. High MCHC (>36 g/dL) is less common but can occur in conditions like spherocytosis or due to artifact (e.g., cold agglutinins, lipemia).

Red Cell Distribution Width (RDW or RDW-CV) measures the variation in the size of red blood cells (anisocytosis), reported as a percentage coefficient of variation. A high RDW indicates a large variation in cell sizes, commonly seen early in iron deficiency anemia (mix of small and normal cells) and B12/folate deficiency (mix of large and normal cells), often before MCV changes. Consistently low RDW (<13%) is generally considered optimal, indicating uniform cell size.

Neutrophils Percentage represents the proportion of neutrophils among all white blood cells in a differential count. Neutrophils are the most abundant type of WBC and are primary responders to bacterial infections. Increased percentage (relative neutrophilia) suggests infection or inflammation, while decreased percentage (relative neutropenia) might be seen with increases in other cell types like lymphocytes.

Absolute Neutrophil Count (ANC) measures the total number of neutrophils per volume of blood (WBC count x Neutrophil %). It provides a direct measure of the body's primary defense against bacterial infections. Low ANC (neutropenia, especially <1000 or <500 cells/uL) significantly increases infection risk, often seen after chemotherapy or with certain disorders. High ANC (neutrophilia) typically indicates infection or inflammation.

Eosinophils Percentage indicates the proportion of eosinophils in the WBC differential. Eosinophils are involved in fighting parasitic infections and modulating allergic inflammatory responses. Increased percentage (eosinophilia) is commonly associated with allergies, asthma, parasitic infections, and certain skin or inflammatory disorders.

Basophils Percentage represents the proportion of basophils, the least common type of granulocyte. They contain histamine and heparin and are involved in allergic reactions and inflammatory responses. Increased percentage (basophilia) is uncommon but can be seen in allergic reactions, chronic inflammation, hypothyroidism, or certain blood disorders (like CML).

White Blood Cell (WBC) Count, also known as leukocyte count, measures the total number of white blood cells in the blood. These cells are key components of the immune system. Elevated levels (leukocytosis) often indicate infection, inflammation, or stress, while low levels (leukopenia) can result from bone marrow issues, certain infections, or medications, increasing susceptibility to infection.

Mean Platelet Volume (MPV) measures the average size of platelets in the blood. Younger platelets released from the bone marrow are typically larger. High MPV can indicate increased platelet production and turnover, sometimes seen with inflammation, recovery from thrombocytopenia, or certain genetic conditions. Low MPV might suggest impaired platelet production (e.g., aplastic anemia). Interpretation often combined with platelet count and PDW.

Serum Albumin is the most abundant protein in the blood, synthesized by the liver. It maintains oncotic pressure (keeping fluid in blood vessels), transports hormones, fatty acids, and drugs, and acts as an antioxidant and anti-inflammatory mediator. Low levels can indicate liver disease, kidney disease (loss in urine), malnutrition, chronic inflammation, or infection (negative acute phase reactant). High levels usually suggest dehydration.

Serum Creatinine is a waste product generated from muscle metabolism (creatine breakdown). It is filtered out of the blood by the kidneys, so blood levels are a key indicator of kidney filtration function when considered alongside factors like age, sex, race, and muscle mass. Higher levels generally indicate poorer kidney function. Use eGFR (Estimated Glomerular Filtration Rate) calculated from Creatinine for a better assessment of kidney function.

Serum Potassium is the primary intracellular cation, essential for nerve conduction, muscle contraction (especially the heart), and fluid balance. Serum levels are kept within a narrow range, primarily regulated by the kidneys. Abnormal levels (hypokalemia or hyperkalemia) can cause serious cardiac arrhythmias and muscle weakness, resulting from kidney disease, medications (diuretics, ACE inhibitors), hormonal issues, or severe fluid loss.

Total Protein measures the combined concentration of all proteins in the blood serum, primarily albumin and globulins. It provides a general indication of nutritional status, liver function (protein synthesis), kidney function (protein loss), and hydration. Abnormal levels usually prompt investigation of specific protein fractions (albumin, globulin types).

Serum Sodium is the main cation in extracellular fluid and crucial for maintaining fluid balance, nerve impulse transmission, and muscle function. Levels are tightly regulated by the kidneys and hormones. Abnormal levels (hyponatremia or hypernatremia) usually reflect disturbances in water balance rather than sodium intake, often related to kidney function, hormonal issues (like ADH), or excessive fluid loss/gain.

Alkaline Phosphatase (ALP) is an enzyme found primarily in the liver (bile ducts), bone, intestines, and placenta. Elevated levels can indicate liver disease (especially cholestatic conditions affecting bile flow), bone disorders with increased bone turnover (e.g., Paget's disease, fractures, growing children, vitamin D deficiency), or, rarely, other causes. Isoenzyme testing can help determine the source (liver vs. bone).

Serum Chloride is the major anion in extracellular fluid, working with sodium to maintain fluid balance and acid-base status. Levels often mirror sodium levels. Abnormal chloride levels can result from dehydration, kidney disease, excessive vomiting or diarrhea, or acid-base disturbances (like metabolic acidosis or alkalosis).

Total Carbon Dioxide (CO2) content in serum primarily reflects the level of bicarbonate (HCO3-), a major component of the body's acid-base buffering system managed by the kidneys and lungs. Abnormal levels indicate acid-base imbalances: low levels suggest metabolic acidosis or respiratory alkalosis, while high levels suggest metabolic alkalosis or respiratory acidosis.

Serum Globulin is a calculated value (Total Protein - Albumin) representing a diverse group of proteins, including immunoglobulins (antibodies) and carrier proteins. Elevated globulins can indicate chronic inflammation, infection, autoimmune diseases, or certain blood cancers (like multiple myeloma). Low levels are less common but might occur with immunodeficiency or protein loss. The Albumin/Globulin ratio (A/G Ratio) is often considered, with optimal > 1.5.

Serum Calcium measures the total amount of calcium (bound to albumin and free/ionized) in the blood. Calcium is essential for bone health, muscle contraction, nerve signaling, and blood clotting. Levels are tightly regulated by parathyroid hormone (PTH) and vitamin D. Abnormal levels can indicate issues with the parathyroid glands, vitamin D status, kidney function, or certain cancers. Ionized calcium is the biologically active form and may be more accurate if albumin is abnormal.

Total Bilirubin measures the sum of direct (conjugated) and indirect (unconjugated) bilirubin in the blood. Bilirubin is a yellowish pigment produced from the breakdown of heme (mostly from red blood cells). Elevated levels cause jaundice (yellowing of skin/eyes) and can indicate liver disease (impaired conjugation/excretion), bile duct obstruction, or increased RBC breakdown (hemolysis). Gilbert's syndrome is a common, benign cause of mild unconjugated hyperbilirubinemia.

Aspartate Aminotransferase (AST) is an enzyme found primarily in the liver, heart, skeletal muscle, and kidneys. Elevated serum AST levels often indicate liver cell damage (hepatitis, toxins, ischemia) but can also rise due to muscle injury (including heart attack) or hemolysis. Its interpretation requires context, often alongside ALT (ALT is more liver-specific).

Blood Urea Nitrogen (BUN) measures the amount of nitrogen in the blood that comes from urea, a waste product formed in the liver from protein metabolism and excreted by the kidneys. Elevated BUN can indicate decreased kidney function, dehydration, high protein intake, or gastrointestinal bleeding. Low BUN is less common but can occur with liver disease or malnutrition. Often interpreted alongside creatinine (BUN/Creatinine ratio).

Fasting Glucose measures blood sugar levels after an overnight fast (typically 8-12 hours). It reflects baseline glucose regulation. While standard guidelines define diabetes risk based on thresholds (e.g., prediabetes 100-125 mg/dL, diabetes ≥126 mg/dL), longevity experts emphasize maintaining levels in a tighter, lower optimal range (e.g., 70-90 mg/dL) for better metabolic health, reduced glycation, and potentially lower risk of age-related diseases. Continuous Glucose Monitoring (CGM) provides much richer data on glucose variability and post-meal responses.

Albumin/Globulin Ratio is a calculated value (Albumin / Globulin) representing the ratio of albumin to globulin in the blood. It is often used to assess liver function and inflammation.

Alanine Aminotransferase (ALT) is an enzyme found predominantly in liver cells. Elevated serum ALT is a more specific indicator of liver cell injury or inflammation (hepatitis, fatty liver disease, drug toxicity) than AST. Consistently maintaining ALT in the lower end of the reference range is associated with better liver health.

Ferritin is the most sensitive test for iron stores in the body, but it can also be elevated during inflammation, which can mask iron deficiency. Use our Iron Status Interpreter for a comprehensive assessment of your iron levels.

Hemoglobin A1c (HbA1c) reflects average blood glucose levels over the preceding 2-3 months by measuring the percentage of hemoglobin protein in red blood cells that has glucose attached (glycated). It's a key marker for diagnosing and monitoring diabetes risk. While valuable, HbA1c is an average and doesn't capture glucose variability or spikes; Continuous Glucose Monitoring (CGM) provides a more comprehensive view of glycemic control. Standard Interpretation:

• < 5.7%: Normal
• 5.7% - 6.4%: Prediabetes
• ≥ 6.5%: Diabetes For optimal health and minimizing glycation-related damage associated with aging, longevity experts often target levels below the prediabetes threshold, ideally <5.5% or even <5.3%.

Homocysteine is an amino acid involved in methylation pathways. Elevated levels can be pro-inflammatory, damage endothelial cells, and are associated with increased risk of cardiovascular disease, stroke, and potentially cognitive decline. Levels are influenced by genetics and status of B vitamins (B6, B12, Folate). Optimal levels for longevity are generally targeted below 9 or 10 μmol/L.

Fasting Insulin measures the level of insulin hormone after an overnight fast. Insulin regulates blood glucose uptake into cells. Elevated fasting insulin (hyperinsulinemia) is an early sign of insulin resistance, often preceding elevations in glucose or HbA1c. Maintaining low fasting insulin levels is crucial for metabolic health and longevity. Note: Results are highly unreliable if not measured in a truly fasted state (8-12 hours).

Serum Iron measures the amount of iron circulating in the blood, mostly bound to the transport protein transferrin. Levels fluctuate significantly throughout the day (diurnal variation, highest in AM) and are influenced by recent dietary intake. While low levels can contribute to diagnosing iron deficiency, serum iron alone is not a reliable indicator of total body iron stores (ferritin is better) or functional iron status (TSAT is better). It is usually interpreted alongside TIBC and transferrin saturation.

Transferrin Saturation (TSAT), often called Iron Saturation, calculates the percentage of iron-binding sites on transferrin that are occupied by iron (TSAT % = [Serum Iron / TIBC] x 100, or calculated using transferrin). It reflects how much iron is readily available for delivery to tissues.

• Low TSAT (<15-20%) is a key indicator of functional iron deficiency (insufficient iron delivery for erythropoiesis), even if ferritin is normal/high due to inflammation.
• High TSAT (>45-50%, especially >55-60%) suggests increased iron load and potential risk for iron overload (e.g., hemochromatosis).

Total Iron Binding Capacity (TIBC) measures the blood's capacity to bind iron with transferrin, indirectly reflecting the amount of available transferrin. In iron deficiency, the body produces more transferrin to capture scarce iron, leading to a high TIBC. Conversely, in iron overload or chronic inflammation/infection (transferrin is a negative acute phase reactant), TIBC is often low or normal.

Lipoprotein(a), or Lp(a), is a specific type of lipoprotein particle whose levels are largely genetically determined, so it is not a target for optimization and only needs to be measured once. Elevated Lp(a) is an independent and causal risk factor for cardiovascular disease (ASCVD) and aortic stenosis. Unlike other lipids, levels are less influenced by lifestyle. Measuring Lp(a) is crucial for comprehensive risk assessment, as high levels warrant more aggressive management of other modifiable risk factors.

Total Cholesterol measures the sum of all cholesterol types in the blood (LDL-C, HDL-C, VLDL-C etc.). While historically used, its significance in isolation is limited compared to specific lipoprotein fractions like ApoB, LDL-P, or Non-HDL-C, especially for longevity goals. It provides a very broad overview but isn't a primary target for optimization, as risk is driven by the number of atherogenic particles (ApoB). E.g., a TC of 180 mg/dL could be optimal (HDL 85, non-HDL 95) or poor (HDL 35, non-HDL 145). Use within/outside standard reference range.

Triglycerides (TG) are a type of fat (lipid) found in the blood, primarily carried by VLDL particles. Elevated fasting triglycerides are a marker of metabolic dysfunction, often linked to insulin resistance, high carbohydrate intake, and increased cardiovascular risk. Optimal levels are generally considered much lower than standard guidelines, ideally <100 mg/dL, and potentially even <75 mg/dL for peak metabolic health and longevity. Note: Results are less reliable if not measured in a fasted state (8-12 hours).

High-Density Lipoprotein Cholesterol (HDL-C), often termed "good" cholesterol, measures the amount of cholesterol carried by HDL particles. HDL is involved in reverse cholesterol transport, moving cholesterol away from arteries. While higher levels are generally correlated with lower cardiovascular risk, the functionality of HDL particles is also critical, not just the cholesterol quantity. Optimal levels are generally considered >50 mg/dL, but extremely high levels may not offer further benefit and the focus is shifting towards HDL function and particle characteristics.

Non-HDL Cholesterol is calculated as Total Cholesterol minus HDL-C. It represents the cholesterol content in all potentially atherogenic lipoproteins (LDL, VLDL, IDL, Lp(a)). It serves as a good surrogate marker for ApoB when direct measurement isn't available. Lower levels are better for cardiovascular health, with optimal targets for longevity often set significantly below standard guidelines (e.g., <100 mg/dL or even <80 mg/dL).

Thyroid-Stimulating Hormone (TSH), produced by the pituitary gland, regulates thyroid hormone production. High TSH suggests hypothyroidism (underactive thyroid), while low TSH suggests hyperthyroidism (overactive thyroid). While standard ranges are broad (e.g., ~0.4-4.5 mIU/L), many longevity and functional medicine experts advocate for a narrower optimal range for better overall well-being, even in the absence of overt disease. Note: In elderly individuals (e.g., >70-80 years old), TSH may naturally be slightly higher (e.g., up to 5-7 mIU/L) without necessarily indicating pathology or requiring treatment.

Uric Acid is a waste product formed from the breakdown of purines (found in DNA and certain foods/drinks like alcohol, red meat, fructose). Elevated levels (hyperuricemia) can lead to gout (crystal deposition in joints) and kidney stones. High uric acid is also increasingly recognized as a marker and potential contributor to metabolic syndrome, insulin resistance, hypertension, and cardiovascular disease.

Vitamin B12 (Cobalamin) is essential for DNA synthesis, red blood cell formation, neurological function, and methylation processes. Deficiency can lead to megaloblastic anemia, neurological damage (numbness, balance problems, cognitive impairment), and elevated homocysteine and MMA. Serum B12 reflects recent intake and circulating levels, but may not perfectly represent tissue stores, especially in the lower end of the normal range. Optimal levels for neurological health are often considered significantly higher than the lower limit of standard lab ranges (e.g., >400-500 pg/mL). Functional markers like MMA and homocysteine can help confirm status if serum B12 is borderline.

Serum Folate (Vitamin B9) measures the level of folate circulating in the blood. Folate is crucial for DNA synthesis and repair, red blood cell production, and methylation reactions (working with B12). Deficiency causes megaloblastic anemia and elevated homocysteine, and is critical to prevent during pregnancy to avoid neural tube defects. Serum folate reflects recent intake. RBC Folate is a better marker of long-term stores. Optimal serum levels are generally well above the deficiency threshold (e.g., >10-15 ng/mL).

25-Hydroxy Vitamin D [25(OH)D] is the primary circulating form of vitamin D and the best measure of overall vitamin D status. Vitamin D is crucial for calcium absorption, bone health, immune function, and cellular regulation. Deficiency is widespread and linked to various health issues.

High-Sensitivity C-Reactive Protein (hs-CRP) measures low levels of CRP to detect chronic, low-grade inflammation strongly associated with cardiovascular disease risk. Unlike standard CRP, hs-CRP quantifies subtle inflammation within the artery walls. Optimal levels for longevity are considered very low (<1.0 mg/L). Levels >3.0 mg/L indicate higher cardiovascular risk. Note: Results should be interpreted cautiously if measured during or soon after acute illness, infection, or injury, as these can cause transient elevations. Consider repeat testing when baseline health is stable.

Assesses the color of the urine (e.g., pale yellow, yellow, dark yellow, amber). Abnormal colors (e.g., red, brown, green, orange) can indicate various conditions like dehydration, hematuria, liver disease, medications, or diet.

Measures urine density or concentration compared to pure water. It reflects the kidney's ability to concentrate or dilute urine, indicating hydration status and renal concentrating ability. Low SG suggests dilute urine (e.g., overhydration, diabetes insipidus); high SG suggests concentrated urine (e.g., dehydration, glycosuria, proteinuria, SIADH).

Measures the acidity or alkalinity of urine. Influenced by diet, medications, and metabolic or kidney disorders (e.g., renal tubular acidosis). Useful in evaluating acid-base status and managing kidney stones.

Detects protein in urine, a sign of kidney disease or other conditions. Elevated levels can indicate kidney disease, liver disease, or certain medications.

Detects glucose in urine, a sign of diabetes or other metabolic disorders. Elevated levels can indicate diabetes, kidney disease, or certain medications.

Detects ketones (acetone, acetoacetic acid, beta-hydroxybutyrate) in urine, byproducts of fat metabolism. Ketonuria can occur in diabetic ketoacidosis, starvation, prolonged vomiting, low-carbohydrate diets, or febrile illnesses.

Detects bilirubin, a yellow pigment produced by the breakdown of hemoglobin. Elevated levels can indicate liver disease, hemolytic anemias, or certain medications.

Detects intact red blood cells (hematuria) or free hemoglobin (hemoglobinuria)/myoglobin (myoglobinuria). Positive results can indicate kidney disease, urinary tract infection, stones, tumors, trauma, or muscle injury.

Detects nitrite, formed when certain Gram-negative bacteria (e.g., E. coli) convert urinary nitrates. A positive test is a strong indicator of bacteriuria and potential urinary tract infection (UTI).

Detects leukocyte esterase, an enzyme from white blood cells (leukocytes). A positive test indicates pyuria (WBCs in urine), suggesting inflammation, commonly due to UTI.

Detects crystals in the urine, such as calcium oxalate, uric acid, or struvite. The type and quantity of crystals can indicate conditions like dehydration, urinary tract infections, kidney stones, or certain metabolic disorders. They are often reported qualitatively (e.g., none, few, moderate, many).

Cells from the lining of the urinary tract. Large numbers can suggest inflammation or contamination.

Hyaline casts are the most common type of urinary cast, composed primarily of Tamm-Horsfall protein. While small numbers can be normal, particularly after strenuous exercise or dehydration, large numbers may indicate kidney disease. They are generally considered non-specific.

Granular casts are thought to represent the breakdown of cellular casts (like WBC or epithelial casts) or the aggregation of serum proteins. Their presence, especially when coarse or "muddy brown," is indicative of acute tubular necrosis (ATN) and significant chronic kidney disease.

Red Blood Cell (RBC) casts are cylindrical structures composed of RBCs that form in the kidney tubules. Their presence in urine is indicative of glomerular damage, suggesting intrinsic kidney diseases like glomerulonephritis or vasculitis, as it implies bleeding within the nephron.

Presence of bacteria in urine, a strong indicator of a urinary tract infection.