Biomarker Library

Why it matters

Low total T is linked to fatigue, low libido, depression, and loss of muscle mass. Optimal levels are 500-900 ng/dL.

Why it matters

Even with normal total T, low free T means your body can't utilize enough testosterone for optimal function.

Why it matters

High SHBG reduces free testosterone. Low SHBG can indicate insulin resistance or liver issues.

Why it matters

Too high causes gynecomastia and water retention. Too low impairs bone density and libido.

Why it matters

Declines with age. Low levels correlate with fatigue, weakened immunity, and accelerated aging.

Why it matters

Helps differentiate primary (testicular) vs secondary (pituitary) causes of low testosterone.

Why it matters

Elevated FSH with low T suggests testicular failure. Important for fertility assessment.

Why it matters

High prolactin can cause low libido, erectile dysfunction, and in rare cases indicates a pituitary tumor.

Why it matters

High TSH suggests hypothyroidism (fatigue, weight gain). Low TSH suggests hyperthyroidism.

Why it matters

Low free T4 with high TSH confirms hypothyroidism. Essential for metabolism regulation.

Why it matters

Some people have poor T4-to-T3 conversion. Low free T3 causes fatigue despite normal TSH.

Why it matters

Elevated TPO antibodies predict future thyroid failure, even when TSH is still normal.

Why it matters

The gold standard for diabetes screening. Levels above 5.7% indicate prediabetes.

Why it matters

Fasting glucose above 100 mg/dL suggests insulin resistance. Above 126 indicates diabetes.

Why it matters

High fasting insulin is an early warning of insulin resistance — often years before glucose rises.

Why it matters

Chronically elevated cortisol breaks down muscle, increases belly fat, and suppresses testosterone.

Why it matters

A starting point for cardiovascular risk assessment, though individual components matter more.

Why it matters

Elevated LDL is the primary driver of atherosclerosis and heart disease risk.

Why it matters

Higher HDL is protective. Levels below 40 mg/dL significantly increase cardiovascular risk.

Why it matters

ApoB is a better predictor of heart disease than LDL alone. It counts the actual number of harmful particles.

Why it matters

Elevated hsCRP doubles cardiovascular risk independent of cholesterol. Also tracks chronic inflammation.

Why it matters

Deficiency is linked to low testosterone, depression, weak bones, and impaired immunity. Optimal is 40-60 ng/mL.

Why it matters

Deficiency causes fatigue, brain fog, numbness, and anemia. Common in men over 50.

Why it matters

Low ferritin causes fatigue and poor exercise performance. High ferritin can indicate iron overload.

Why it matters

Deficiency impairs sleep, muscle recovery, testosterone production, and insulin sensitivity.

Why it matters

Zinc deficiency directly suppresses testosterone and impairs immune response.

Why it matters

Elevated ALT can indicate fatty liver disease, medication toxicity, or alcohol-related damage.

Why it matters

Elevated AST alongside ALT points to liver issues. Elevated alone may indicate muscle damage.

Why it matters

GGT rises early in liver stress. Also an independent predictor of cardiovascular disease.

Why it matters

Elevated creatinine suggests impaired kidney function. Important to monitor if taking supplements like creatine.

Why it matters

High BUN can indicate dehydration, high protein intake, or kidney problems.

Why it matters

Values below 60 indicate chronic kidney disease. A critical marker often missed in basic panels.

Why it matters

Elevated homocysteine damages blood vessels and is often correctable with B6, B12, and folate.

Why it matters

High uric acid is also an independent risk factor for hypertension and metabolic syndrome.

Why it matters

Abnormal sodium levels affect blood pressure, hydration, and neurological function.

Why it matters

Both high and low potassium can cause dangerous heart arrhythmias and muscle weakness.

Why it matters

Abnormal chloride often accompanies sodium imbalances and can indicate dehydration or kidney issues.

Why it matters

Abnormal CO2 levels can indicate kidney disease, lung problems, or metabolic disorders.

Why it matters

Abnormal calcium may indicate parathyroid disorders, vitamin D deficiency, or kidney disease.

Why it matters

Abnormal levels can indicate liver disease, kidney disease, nutritional deficiency, or immune disorders.

Why it matters

Abnormal globulin levels can indicate chronic inflammation, immune disorders, liver disease, or kidney problems.

Why it matters

Low albumin can indicate liver disease, kidney disease, or malnutrition. Also affects free testosterone levels.

Why it matters

Elevated bilirubin can indicate liver dysfunction, bile duct obstruction, or increased red blood cell destruction.

Why it matters

Elevated ALP can indicate liver disease, bile duct obstruction, or bone disorders.

Why it matters

Helps assess overall thyroid hormone production. Used alongside TSH for a complete thyroid picture.

Why it matters

Helps interpret total T4 results by accounting for binding protein levels. Used to calculate Free T4 Index.

Why it matters

Provides a reliable estimate of free thyroid hormone when direct free T4 measurement is not available.

Why it matters

High triglycerides increase cardiovascular risk and are closely linked to insulin resistance and metabolic syndrome.

Why it matters

Elevated VLDL contributes to plaque buildup in arteries and reflects high triglyceride levels.

Why it matters

High WBC may indicate infection, inflammation, or stress. Low WBC can signal immune deficiency.

Why it matters

Low RBC indicates anemia. High RBC can occur with testosterone therapy or dehydration.

Why it matters

Low hemoglobin means anemia and fatigue. Testosterone therapy can raise hemoglobin — monitoring is essential.

Why it matters

High hematocrit thickens blood and increases clot risk. Critical to monitor on TRT. Low values indicate anemia.

Why it matters

Small red cells suggest iron deficiency. Large red cells suggest B12 or folate deficiency.

Why it matters

Helps classify the type of anemia when red blood cell counts are abnormal.

Why it matters

Low MCHC confirms iron deficiency anemia. High MCHC can indicate spherocytosis.

Why it matters

Elevated RDW is an early indicator of nutritional deficiencies and is linked to cardiovascular mortality risk.

Why it matters

Low platelets increase bleeding risk. High platelets can indicate inflammation or bone marrow disorders.

Why it matters

High neutrophils suggest bacterial infection or acute stress. Low levels increase infection susceptibility.

Why it matters

Elevated in viral infections. Low lymphocytes can indicate immune suppression or chronic stress.

Why it matters

Elevated monocytes can indicate chronic inflammation, infection, or autoimmune conditions.

Why it matters

Elevated eosinophils suggest allergies, asthma, or parasitic infection.

Why it matters

Elevated basophils can indicate allergic reactions, chronic inflammation, or certain blood disorders.

Why it matters

Large platelets are more reactive and may indicate increased clotting risk or bone marrow stimulation.

Why it matters

Elevated progesterone in men can suppress libido and mood. Low levels may impair neurosteroid function and sleep quality.

Why it matters

A more complete measure of usable testosterone than free T alone, especially when SHBG is abnormal.

Why it matters

A ratio above 5.0 indicates higher cardiovascular risk. Below 3.5 is considered optimal.

Why it matters

A better predictor of cardiovascular risk than LDL alone because it includes VLDL and other harmful particles.

Why it matters

Low iron causes fatigue, weakness, and poor exercise performance. High iron can damage organs over time.

Why it matters

High TIBC suggests iron deficiency. Low TIBC may indicate iron overload, liver disease, or chronic inflammation.

Why it matters

Low saturation confirms iron deficiency. High saturation (above 45%) may indicate hemochromatosis or iron overload.

Why it matters

Deficiency causes megaloblastic anemia and elevated homocysteine, increasing cardiovascular risk.

Why it matters

Serum magnesium can appear normal even when intracellular stores are depleted. RBC magnesium catches deficiency earlier.

Why it matters

Makes HbA1c results easier to understand by translating them into the same units as a glucose meter reading.

Why it matters

Abnormal phosphate levels can indicate kidney disease, parathyroid disorders, or vitamin D imbalances.

Why it matters

A low ratio can indicate liver disease, autoimmune conditions, or chronic infections.

Why it matters

A high ratio suggests dehydration, GI bleeding, or high protein intake. A low ratio may indicate liver disease or malnutrition.

Why it matters

Counts below 1,500 (neutropenia) significantly increase infection risk. Elevated counts indicate active infection or inflammation.

Why it matters

Low counts may indicate immune deficiency or viral infection. High counts can suggest chronic infection or lymphoproliferative disorders.

Why it matters

Elevated absolute monocytes can indicate chronic inflammation, infection recovery, or certain blood disorders.

Why it matters

Elevated counts suggest allergies, asthma, parasitic infections, or eosinophilic disorders.

Why it matters

Elevated counts can indicate allergic reactions, chronic inflammation, or myeloproliferative disorders.

Why it matters

A "left shift" (elevated bands) indicates the body is fighting an acute infection and mobilizing immature cells.

Why it matters

Elevated absolute bands confirm a left shift — the immune system is actively fighting infection.

Why it matters

Commonly elevated in mononucleosis (EBV), CMV, and other viral infections.

Why it matters

Helps quantify the immune response during viral infections like EBV or CMV.

Why it matters

Their presence in blood (leukoerythroblastic reaction) can indicate severe infection, bone marrow stress, or hematologic disorders.

Why it matters

Presence suggests significant bone marrow stimulation from severe infection or marrow pathology.

Why it matters

Finding myelocytes in blood may indicate a serious bone marrow disorder, severe infection, or leukemia.

Why it matters

Quantifies early granulocyte precursors — significant presence warrants further hematologic investigation.

Why it matters

May indicate acute promyelocytic leukemia (APL) or other serious bone marrow disorders requiring urgent evaluation.

Why it matters

Any significant number in blood is abnormal and may require urgent hematologic evaluation.

Why it matters

Blasts in blood can indicate acute leukemia or myelodysplastic syndrome and require immediate medical attention.

Why it matters

Any significant presence of blasts requires urgent hematologic workup for possible leukemia.

Why it matters

Presence suggests severe anemia, bone marrow stress, extramedullary hematopoiesis, or significant physiologic stress.

Why it matters

Quantifies immature red cells in blood — elevated counts warrant investigation for bone marrow pathology.

Why it matters

Elevated prolymphocytes can indicate prolymphocytic leukemia or transformation of chronic lymphocytic leukemia.

Why it matters

Significant numbers may indicate lymphoproliferative disorders requiring hematologic evaluation.

Why it matters

Circulating plasma cells can indicate multiple myeloma, viral infections, or other plasma cell disorders.

Why it matters

Significant presence may indicate multiple myeloma or plasma cell neoplasm requiring further workup.

Why it matters

Used to verify or correct automated platelet counts, especially when clumping is suspected.

Why it matters

Identifies abnormal cell shapes (sickle cells, target cells, schistocytes) that automated analyzers may miss.