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Understand the 1-mg low-dose dexamethasone suppression test, the common cortisol cutoff of 1.8 mcg/dL, causes of nonsuppression, and the follow-up used for Cushing screening.

Low-Dose Dexamethasone Suppression Test: Cushing Syndrome Screening and Results

Learn how an 8–9 a.m. cortisol test screens for adrenal insufficiency, what low and intermediate results mean, how ACTH helps identify the cause, and when stimulation testing is needed.

Morning Cortisol Test: Low Levels, Adrenal Insufficiency, and Results

Learn how a pheochromocytoma and paraganglioma panel uses plasma or urine metanephrines, normetanephrine, catecholamines, and controlled collection to interpret abnormal results.

Pheochromocytoma and Paraganglioma Test Panel: Metanephrines, Normetanephrine, Catecholamines, and Results

Learn what plasma epinephrine, norepinephrine, and dopamine results mean, why collection posture matters, common causes of high values, and when metanephrine testing is preferred.

Plasma Catecholamines Test: Epinephrine, Norepinephrine, Dopamine, and Results

Learn how plasma free metanephrine and normetanephrine testing screens for pheochromocytoma and paraganglioma, why supine rest matters, and how high or borderline results are evaluated.

Plasma Free Metanephrines Test: Pheochromocytoma and Paraganglioma Screening, High Levels, and Results

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

Diagnostics

Home Diagnostics Page 26

Low alkaline phosphatase can point to zinc deficiency, malnutrition, thyroid disease, anemia, Wilson disease, or rare hypophosphatasia. Learn what low ALP means, which follow-up tests help, and when medical care matters.

Low Alkaline Phosphatase (ALP) Test: Causes, Zinc Deficiency, Malnutrition, and Meaning

Low ALP can reflect zinc deficiency, malnutrition, hypothyroidism, anemia, lab interference, or hypophosphatasia. Learn how to interpret low alkaline phosphatase patterns with zinc and related blood tests.

Low ALP and Zinc: Interpreting Low Alkaline Phosphatase Patterns

Low amylase may suggest chronic pancreas damage, exocrine pancreatic insufficiency, cystic fibrosis, metabolic patterns, or lab variation. Learn causes, symptoms, follow-up tests, and when to seek care.

Low Amylase Blood Test: Causes, Pancreas Function, and Meaning

Low AST is usually less concerning than high AST, but it can sometimes relate to vitamin B6 status, low muscle mass, malnutrition, chronic illness, or lab variation. Learn how to interpret low AST with ALT, liver panel results, symptoms, and follow-up testing.

Low Aspartate Aminotransferase (AST) Test: Causes, Vitamin B6, Liver Health, and...

Low globulin on a blood test can reflect low antibodies, protein loss, liver disease, kidney disease, malnutrition, or lab variation. Learn what patterns and follow-up tests help clarify the cause.

Low Globulin Blood Test: Causes, Immune Deficiency, Protein Loss, and Meaning

Low total protein on a blood test can mean low albumin, low globulin, malnutrition, liver disease, kidney protein loss, gut protein loss, inflammation, or fluid dilution.

Low Total Protein Blood Test: Causes, Malnutrition, Liver Disease, Kidney Loss,...

Low trypsinogen may suggest reduced pancreas enzyme production, especially with greasy stools, weight loss, chronic pancreatitis, or pancreatic surgery. Learn causes, follow-up tests, symptoms, and treatment options.

Low Trypsinogen Blood Test: Causes, Pancreas Function, and Meaning

Learn what the NASH FibroSure test measures, how fibrosis, steatosis, and NASH scores are interpreted, what abnormal results may mean, and when follow-up testing matters.

NASH FibroSure Test: Fatty Liver, NASH, Steatosis, Fibrosis Score, and Results

Learn what a pancreatic amylase test measures, what high pancreatic amylase can mean, how normal ranges vary, and how results relate to pancreatitis, lipase, and pancreas health.

Pancreatic Amylase Test: High Pancreatic Amylase, Normal Range, Pancreatitis, and Pancreas...

Learn what the PEth blood test measures, how PEth levels are interpreted, how long PEth stays detectable, and how results compare with CDT, GGT, EtG, and liver enzyme tests.

Phosphatidylethanol (PEth) Blood Test: Alcohol Biomarker, PEth Levels, Detection Window, and...

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...

Learn what a serum bile acids test measures, what high bile acids can mean, normal ranges, cholestasis patterns, pregnancy concerns, liver function links, and follow-up steps.

Serum Bile Acids Test: High Bile Acids, Normal Range, Cholestasis, Liver...

Learn what the TIMP-1 blood test measures, why high TIMP-1 can be linked to liver fibrosis, how ELF scores use TIMP-1, and what abnormal results may mean.

Tissue Inhibitor of Metalloproteinase-1 (TIMP-1) Test: Liver Fibrosis Marker, High Levels,...

Learn what a total bilirubin blood test measures, the normal range, what high bilirubin can mean, how jaundice develops, and when follow-up testing or urgent care matters.

Total Bilirubin Blood Test: High Bilirubin, Normal Range, Jaundice, and Causes

Learn the total protein blood test normal range, what high and low results can mean, how albumin, globulin, and A/G ratio affect interpretation, and when follow-up testing may be needed.

Total Protein Blood Test Normal Range: Reference Values and Meaning

Learn what the trypsinogen blood test measures, common adult normal ranges, and what high or low trypsinogen may mean for pancreatic inflammation, pancreatic insufficiency, and newborn cystic fibrosis screening.

Trypsinogen Blood Test Normal Range: Reference Values and Meaning

Learn what an advanced lipid panel measures, including ApoB, Lp(a), LDL-P, particle size, and small dense LDL, and how results help refine heart disease risk.

Advanced Lipid Panel Test: ApoB, Lp(a), LDL-P, Particle Size, and Heart...

Learn how ApoB and LDL cholesterol differ, when ApoB adds useful heart risk insight, and how to interpret high or discordant results without overreacting.

ApoB and LDL Cholesterol: Interpreting Heart Risk Without Overdoing It

ApoB vs LDL cholesterol explained in plain language, including what each marker measures, when ApoB is more useful, target ranges, testing tips, and how to lower particle-related heart risk.

ApoB vs LDL Cholesterol: Which Heart Risk Marker Matters More?

Learn what the ApoB/ApoA1 ratio test measures, normal and high ranges, cardiovascular risk meaning, common causes, preparation, and ways to improve results.

ApoB/ApoA1 Ratio Test: Normal Range, High Ratio, Cardiovascular Risk, and Results

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