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Learn when a brain CT scan is used, what it can detect, what it may miss, how it compares with MRI, and what to expect before, during, and after the scan.

Brain CT Scan: When It Is Used and What It Can Detect

Learn what a high MCV blood test means, including macrocytosis, macrocytic anemia, vitamin B12 and folate deficiency, common causes, follow-up tests, treatment, and when to seek care.

High Mean Corpuscular Volume (MCV) Test: Causes, Macrocytic Anemia, B12, Folate, and Meaning

Learn how the high-dose dexamethasone suppression test is used in ACTH-dependent Cushing syndrome, what 50% cortisol suppression means, and why other localization tests are often needed.

High-Dose Dexamethasone Suppression Test: Cushing Disease and Results

Learn how learning disability testing works for dyslexia, dysgraphia, and dyscalculia, including what evaluations measure, how diagnosis is made, and what happens after results.

Learning Disability Testing: How Dyslexia, Dysgraphia, and Dyscalculia Are Diagnosed

Learn what a low RBC count means, including anemia causes, symptoms, normal ranges, follow-up tests, urgent warning signs, and treatment by cause.

Low Red Blood Cell (RBC) Count Test: Causes, Anemia, Symptoms, and Meaning

Understand ADH blood testing for water balance, including low and high vasopressin patterns, diabetes insipidus, osmolality, copeptin, collection limits, and next steps.

Antidiuretic Hormone (ADH) Test: Water Balance, Diabetes Insipidus, and Results

Diagnostics

Home Diagnostics

Breast cancer gene panel testing explained: BRCA1/2, PALB2, CHEK2, ATM, positive and VUS results, hereditary risk, screening, and family testing.

Breast Cancer Gene Panel Test: BRCA, PALB2, CHEK2, ATM, and Hereditary...

Learn what an IL-5 test measures, how it relates to eosinophils, asthma, allergy, and eosinophilic disease, and why high or low results require clinical context.

Interleukin-5 (IL-5) Test: Eosinophilic Inflammation, Allergy, Asthma, and Meaning

Learn what the CAGE alcohol screening test measures, how it is scored, when doctors use it, where it falls short, and how it compares with AUDIT and AUDIT-C.

CAGE Alcohol Screening: What It Means and When It Is Used

Understand selenium blood test normal ranges, low and high selenium results, deficiency and toxicity causes, thyroid links, preparation, and safe follow-up steps.

Selenium Blood Test Normal Range: Reference Values and Meaning

Learn what an NRAS mutation means in colon cancer, why NRAS predicts resistance to cetuximab and panitumumab, and how wild-type results fit into extended RAS testing.

NRAS Test for Colon Cancer: Mutation Status, Anti-EGFR Resistance Marker, and...

Understand what a positive anti-RNP antibody test means in MCTD, lupus, and overlap disease, including assay limits, lung risks, follow-up tests, and next steps.

Anti-RNP Antibody Test: Mixed Connective Tissue Disease, Lupus, and Meaning

Targeted variant testing checks relatives for a known family mutation. Learn who should test, what positive and true-negative results mean, and how to follow up.

Targeted Variant Test: Known Mutation, Family Testing, and Results

Understand IGF-1 test results, age-based normal ranges, causes of high or low levels, growth hormone disorders, acromegaly screening, and follow-up testing.

Insulin-Like Growth Factor 1 (IGF-1) Test: High, Low, Normal Range, and...

Learn how autoimmune encephalitis antibody panels detect brain-directed antibodies, when serum and CSF testing are used, and what positive or negative results may mean.

Autoimmune Encephalitis Antibody Panel: Brain Antibodies, Neurologic Symptoms, and Diagnosis

Learn what a high plasma normetanephrine result means, why supine rest matters, common false-positive causes, when clonidine testing is used, and how PPGL evaluation proceeds.

Plasma Normetanephrine Test: High Levels, Pheochromocytoma Screening, and Results

Learn what the Mini-Cog test screens for, who should take it, how it works, what the results mean, and when a fuller memory evaluation is needed.

Mini-Cog Test: What It Screens For and Who Should Take It

Learn what doctors usually do after abnormal brain imaging or cognitive test results, including urgent warning signs, repeat testing, specialist referrals, and how follow-up decisions are made.

What Happens After Abnormal Brain Scan or Cognitive Test Results?

Learn why random GH levels are difficult to interpret, how stimulation and suppression tests define low or high growth hormone, and which age-, assay-, and protocol-specific results guide diagnosis.

Growth Hormone (GH) Test: High, Low, Normal Range, and Results

Understand CXCR4 mutation testing in Waldenstrom macroglobulinemia, including positive and negative results, common variants, prognosis, BTK inhibitor response, and test limits.

CXCR4 Mutation Test: Waldenstrom Macroglobulinemia, Mutation Status, and Disease Meaning

Carbohydrate-deficient transferrin (CDT) is a blood marker of sustained heavy alcohol use. Learn what CDT measures, normal ranges, high results, liver risk, false positives, and follow-up testing mean.

Carbohydrate-Deficient Transferrin (CDT) Test: Alcohol Use Marker, Liver Risk, Normal Range,...

Learn how an insulin blood test is used, what fasting ranges mean, why insulin may be high or low, and how results relate to insulin resistance, diabetes, and hypoglycemia.

Insulin Blood Test: High, Low, Normal Range, Insulin Resistance, and Results

Learn what the PIIINP blood test measures, why high PIIINP can suggest liver fibrosis activity, how normal ranges vary, and how results fit with ELF, FIB-4, liver enzymes, and elastography.

Procollagen III N-Terminal Peptide (PIIINP) Test: High PIIINP, Liver Fibrosis, Normal...

Understand hCG, progesterone, estradiol, and estriol pregnancy tests, what results can show, treatment effects, and when ultrasound or other testing is more useful.

Pregnancy Hormone Test Panel: hCG, Progesterone, Estradiol, Estriol, and Results

Learn what a relaxin blood test measures in pregnancy, why routine testing is uncommon, how pelvic changes are assessed, and what low or high research results may mean.

Relaxin Blood Test: Pregnancy Hormone, Pelvic Changes, and Results

Understand HNF1A MODY genetic test results, diagnostic clues, sulfonylurea sensitivity, insulin transitions, pregnancy care, complications, and family testing.

HNF1A MODY Genetic Test: Diabetes Diagnosis, Treatment, and Results

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